Polyethylene Terephthalate Particles Research Articles

Biodegradation of Microplastic Derived from Poly(ethylene terephthalate) with Bacterial Whole-Cell Biocatalysts.

At present, the pollution of microplastic directly threatens ecology, food safety and even human health. Polyethylene terephthalate (PET) is one of the most common of microplastics. In this study, the micro-size PET particles were employed as analog of microplastic. The engineered strain, which can growth with PET as sole carbon source, was used as biocatalyst for biodegradation of PET particles. A combinatorial processing based on whole-cell biocatalysts was constructed for biodegradation of PET. Compared with enzymes, the products can be used by strain growth and do not accumulated in culture solution. Thus, feedback inhibition of products can be avoided. When PET was treated with the alkaline strain under high pH conditions, the product concentration was higher and the size of PET particles decreased dramatically than that of the biocatalyst under neutral conditions. This shows that the method of combined processing of alkali and organisms is more efficient for biodegradation of PET. The novel approach of combinatorial processing of PET based on whole-cell biocatalysis provides an attractive avenue for the biodegradation of micplastics.

Biodegradation of polyethylene terephthalate waste using Streptomyces species and kinetic modeling of the process

Abstract Polyethylene terephthalate (PET) is one of the most widely used plastics in manufacture of fibers, films, and drinking bottles, etc. It is one of solid wastes which pollutes urban and marine area and gets a lot of sacrifices from creatures. Thus, its removal from the environment is very important for protecting marine life. Different physical, chemical, and biological methods are studied by authors, but because of environmental and economic reasons, biological methods are preferred. These methods are slow and must combined with one or more physical or chemical methods. In this study, biodegradation of PET by Streptomyces species was assessed. Drinking bottles as PET wastes were firstly powdered and classified into four particle sizes. Then 50 mg of samples of each particle size were taken and treated with a fixed number of microorganisms in a culture medium for 18 days at 28 °C within an incubator, and degradation values of the samples were calculated on certain days. Also, a PET film was prepared from bottles and was exposed to biodegradation to show and compare differences between degradation of powdered and film samples. Results showed that final biodegradation percentages for PET particles sizes of 500, 420, 300 and 212 µm were 49.2%, 57.4%, 62.4%, and 68.8%, respectively. We showed that particle size and reaction time were the most important parameters on biodegradation. Also, by-products of biodegradation were analyzed by GC-MS to verify biodegradation process. Kinetic modeling of biodegradation showed that Michaelis-Menten activation or inhibition model can predict experimental results, more precisely.

Replacement of Fine Aggregates with Waste PET in Concrete having Marble Dust as Additive

Plastics are the awfully extensively used material, a standout amongst the most widely recognized plastic in urban waste is PET (Polyethylene Terephthalate) which are used as a crude material for sodas, pop jugs, mineral water bottles and other customer materials. It becomes waste after use and cause pollution to environment so needs solution for this. Objective: The goal of this paper is to study the impact of pulverized PET in concrete and quality change by using this waste as a substitute. Method: In this investigation concrete with 0%,4%,8%,12% and 16% PET supplanting with fine aggregates was done with 2% expansion of marble dust as an added substance to expand the quality of PET concrete. Scanning Electron Microscope (SEM) and X ray Diffraction (XRD) tests were performed on the specimens prepared to know about the shape and nature of PET molecules so that future modifications could be done with the prevailing results. Findings: Increase in strength by the addition of PET particles, also marble dust addition enhances the properties of PET concrete. SEM test shows magnifying image of particles present in PET concrete and XRD test shows the d spacing of particles and type of components in it. Application: Improves the concrete quality and utilization of waste product as PET waste and marble dust waste, protecting the environment. Keywords: Concrete, PET,SEM, XRD

Depolymerization and Assimilation of Poly (Ethylene Terephthalate) By Whole-Cell Bioprocess

Now, biofunctionalization of synthetic polymers can be achieved through biocatalysts. Uniquely among the great enzyme, whole-cell biocatalysts provide a promising alternative for bioprocess. The bioprocess of depolymerization and assimilation of polyethylene terephthalate (PET) was investigated with whole-cell from aeromonas as biocatalyst in this investigation. The engineered aeromonas strain, which can grow with PET particle as sole carbon source and major energy, was employed as biocatalysts. The main products, such as terephtalic acid (TA), bis (2-hydroxyethyl terephthalate) (BHET) and benzoic acid (BA), muconic acid (MA), were recognized in whole-cell bioprocess of PET depolymerization. It showed that variation of these products was more complex than that in case of enzyme treatment, for the interaction of solid insoluble substrate, microbe cell and enzymes secreted by cells in this heterogeneous process. The result demonstrated that not only the ester bonds can be cleaved, but also the benzene ring can be decomposed in the process of whole-cell catalysis. And some of the intermediate products, which have inhibiting effect in enzyme catalysis process, can be utilized and further degraded in whole-cell bioprocess. Furthermore, assays by DSC showed that as degradation of PET progressed, crystallinity of PET granular increased by 1.81% due to preferential degradation of amorphous regions.

Gas production from polyethylene terephthalate using rotating arc plasma

Polyethylene terephthalate (PET) is one of the most widely used macromolecule materials, but the treatment of waste PET has been a great challenge to environment safety. In this article, we report for the first time an effective method to produce gaseous products containing acetylene, ethylene and carbon monoxide from PET particles using a rotating direct current arc plasma reactor. Thermodynamic simulation was performed, and the effect of input power, PET feed rate and working gas flow rate on PET pyrolysis was experimentally investigated. An almost complete carbon conversion could be achieved by this method with a product gas containing 42% acetylene, 53% carbon monoxide and 4% ethylene, while the specific energy consumption of product gas was below 20 kWh/kg. These results show that rotating arc plasma is a promising method of improving the conversion of waste PET to valuable hydrocarbons and syngas.

Prediction models of mechanical properties for pet-mortar composite in sodium sulphateaggressive mediums

In this research, an investigation was carried out on the effect of sodium sulphate attack on the durability of composites produced with waste polyethylene terephthalate (PET). Experiments were accomplished on limestone sand and cement mortars where the blended Portland cement was partially replaced by various volume fractions of waste PET particles (6%, 12% and 17%). The test solutions used to supply the sulphate ions and cations were 5%sodium sulphate solution. Compressive strengths measured on specimens were used to assess the changes in the mechanical properties of PET-mortars exposed to sulphate attack at different ages, mainly the Young modulus of elasticity. Based on experimental compressive tests on PETMortar composite specimens and there densities, the evolution of Young modulus of elasticity has been analyzed in accordance with normative models given by (ACI-318) and (BS-8110) codes of practice. In addition, a comparative study has been carried out for corrosion resistance coefficients K of unmodified mortar to those modified with waste PET particles. It can be noticed that, for the composite immersed in a corrosive Na2SO4 solution, the corrosion resistance coefficients decrease with the increase of the immersion period. The corrosion sulphate resistance K based on Young modulus before and after immersion of PET-mortar composites is better than that of the control mortar. Therefore, for safety considerations of PET-mortar composites use, ACI 318 is recommended code for design and investigation works. Also, it can be concluded that adding waste PET by volume fractions (6%, 12% and 17%) to blend Portland cement renders this cement more resistant to the sodium sulphate aggressive medium. Therefore, composites materials based waste PET aare often presented as the materials of the future because of their potential for innovation and the advantages they offer. In fact, using waste PET as cement substitutes reduces the energy consumption. These modified mortars address problems related to environmental pollution by CO2 emissions, and are used to repair various reinforced concrete structures in sodium sulphate aggressive mediums.

Investigating the mechanical properties of asphalt concrete containing waste polyethylene terephthalate

Reviewing the literature shows that limited work has been conducted on polyethylene terephthalate (PET)-modified asphaltic materials with inconsistent results, missing the investigation of some aspects such as the effect of PET particle size. This paper investigated the effects of waste PET content and particle-size distribution on some engineering properties of asphalt concrete. To this end, Marshall specimens of the mixtures containing different ground waste PET contents of 0%, 2%, 4%, 6%, 8%, and 10% (by the weight of asphalt binder) were subjected to Marshall, indirect tensile strength (ITS), moisture damage, and dynamic creep tests. Two different sizes of PET particles were used: one with particles in the range of 1.18–2.36 mm as coarse-graded PET, and the other with particles in the range of 0.297–0.595 mm, as fine-graded PET. ITS test was conducted on dry and conditioned specimens to evaluate moisture damage susceptibility. Dynamic creep tests were performed under the stress level of 300 kPa at 40°C. Results show that, for both coarse- and fine-graded PET particles, the highest Marshall quotient is achieved at 4% of PET content, after which it decreases with increasing the PET content. Furthermore, results indicate that, for both fine and coarse PET particles, the mixture containing 2% of PET content has the highest ITS and resistance against moisture damage. Based on dynamic creep test results, the resistance against permanent deformation decreases with increasing the PET content. Comparing the results for the mixtures containing coarse and fine PET particles shows that a better performance can be achieved using finer PET particles.

Cellulose Associated with Pet Bottle Waste in Cement Based Composites

The present study was to evaluate the effect of polyethylene terephthalate (PET) particle sizes on the mechanical and physical properties of extruded fiber-cement composites with different particle sizes combined to cellulose pulp in the production of fiber cement by the extrusion process. The design consisted of four formulations, one composed of 5% cellulose and the other three with 2.5% cellulosic pulp and 2.5% of PET particles with different particle sizes. Physical, mechanical and microstructural tests were performed without aging cycles and after 200 and 400 accelerated aging cycles. The degradation of vegetable fibers in the cement and the decrease of properties with aging was observed. PET particles were more resistant in alkaline environment and did not degrade. However, particle size did not exert great effect in the physical and mechanical properties of the composite. Thus, the use of PET particles shows potential as a reinforcement for fiber-cement composites.

Evaluation of the Effect of Plasma Treatment Frequency on the Activation of Polymer Particles

This study investigates the influence of treatment frequency (1–150 kHz) on the atmospheric plasma activation of both silicone and polyethylene terephthalate (PET) particles. These polymer particles with diameters in the range 3–5 mm, were treated using either helium or helium/oxygen gas mixtures, in a barrel atmospheric plasma system. The level of polymer particles activation was monitored using water contact angle measurements. The effect of plasma treatment frequency on barrel heating was monitored using an infrared thermographic camera, the maximum barrel temperature after 15 min treatment was found to be 98 °C at a frequency of 130 kHz. Optical emission spectroscopy was used as a diagnostic tool to monitor changes in atomic and molecular species spectral intensity with experimental conditions, as well as a change in electron energy distribution function. Electrical characterisation studies demonstrated an increase in plasma power with increasing frequency, in the range investigated. X-ray photoelectron spectroscopy analysis indicate an increase of oxygen content on polymer surfaces after plasma treatment. For silicone particles, the minimum polymer water contact angle was obtained by using a frequency of 130 kHz. After 15 min treatment time, the water contact angle decreased from 141° to 11°. While for PET particles the optimum treatment frequency was found to be 70 kHz, resulting in a water contact angle decreased from 94° to 32°. This lower frequency was used due to the partial melting of the PET (Tg of 80 °C), when treated at the higher frequency.

Investigation of a scalable barrel atmospheric plasma reactor for the treatment of polymer particles

This study reports on the performance of a scalable barrel atmospheric plasma system for the treatment of polymer particles. A novel feature of the barrel system design is the use of a biased electrode, which also acts as the roller for the glass barrel. The plasma is generated using either helium or helium/oxygen gas mixtures. The reactor was used to activate 20g batches of silicone, polypropylene (PP), acrylonitrile butadiene styrene (ABS) and polyethylene terephthalate (PET) particles, each with diameters in the range 3 to 5mm. The effect of plasma treatment time and gas flow rate on the water contact angle of the treated polymer particles was examined. The polymer water contact angles decreased from up to 140° to <10° after the barrel plasma treatment (polymer dependent). X-ray photoelectron spectroscopy (XPS) analysis is used to monitor the effect of the plasma treatment on both PET and silicone polymer particles. Optical emission spectroscopy (OES) was used as a diagnostic tool to monitor changes in atomic and molecular species intensity with experimental conditions. Emission lines of helium, oxygen and molecular bands of OH, N2 and N2+ were monitored and correlated with their spatial distribution within the plasma chamber. Electrical characterisation studies demonstrated an increase in plasma power with increasing input voltage and helium flow rate. The heating effect of the plasma was monitored using an infrared thermographic camera, the maximum barrel temperature after 30min treatment found to be 29°C. While the current barrel plasma system design can treat 20g of polymer the system design has the potential to be readily scalable for the activation of larger batches of particles.

Sustainable approach for recycling waste tire rubber and polyethylene terephthalate (PET) to produce green concrete with resistance against sulfuric acid attack

This work presents a study on the potential use of waste crumb tire rubber and polyethylene terephthalate (PET) particles to produce sustainable concrete. In order to find out the feasibility of such concrete in acidic environment, broad laboratory investigations in terms of crushing load, mass, and ultrasonic wave velocity of tire rubberized concrete (TRC) and tire rubberized PET concrete (TRPC) were conducted and assessed by Taguchi method. Afterwards, the results were compared with normal concrete (NC) and normal PET concrete (NPC). 5, 10, and 15 percent of PET particles along with 15 percent of crumb tire rubber substituted for fine natural aggregate with the aim of reducing the consumption of virgin natural resources and disposing of wastes in a safe, effective, and environmentally friendly approach. The significance levels of the experimental parameters, which indicate how the factors affect the crushing load, mass, and ultrasonic wave velocity, were determined by using Analysis of variance (ANOVA) method. The statistical and analytical results showed that using PET in both NPC and TRPC caused the resistance against sulfuric acid to increase after a 60-day sulfuric acid exposure. Although TRC in comparison to NC had a lower resistance against sulfuric acid, substituting 15 percent of PET particles caused the resistance of TRPC against sulfuric acid to increase significantly and reached that of NPC containing 10 percent of PET. The conclusion is that the waste crumb tire rubber can be employed in concrete in case of using PET particles to compensate for the downside of TRC in acidic environments and, in so doing, a large amount of waste material can be disposed of in a sustainable way.

Feasibility study of waste Poly Ethylene Terephthalate (PET) particles as aggregate replacement for acid erosion of sustainable structural normal and lightweight concrete

Using PET as a raw material to produce bottles or containers is very common that after usage leads to a challenging environment protection issue. A large amount of consumed PET become waste and require vast areas of land for storage since several tons of that cannot be fully recycled at once. Concerning this issue, there is a potential to recycle wastes such as waste PET to produce concrete and to prevent the direct contact of plastics with the environment due to a longer service life of concrete. In this study, the resistance of normal PET concrete (NPC) and lightweight PET concrete (LWPC) against sulfuric acid erosion was investigated. Percentages of 5, 10 and 15 of waste PET particles substitute for fine natural aggregate in both NPC and LWPC mixtures. After curing and then immersing specimens in 5% sulfuric acid solution, in intervals of 15, 30 and 60 days, crushing load, mass measuring, and ultrasonic wave velocity tests were conducted on them. According to the results, not only LWPC did erode less than NPC, but also their crushing load reduction, mass loss, and ultrasonic wave velocity reduction rate was lower than the NPC specimens. Furthermore, the lightweight concrete without PET (LWC) showed a lesser reduction rate, compared to normal concrete (NC). Reusing waste PET in concrete consumes large amounts of it, which compensates for its disposal issues, protects natural resources, decreases the dead load of buildings due to its low unit weight, and in this study led to improving acid resistance of both types of concrete.

The effect of using polyethylene terephthalate particles on physical and strength-related properties of concrete; a laboratory evaluation

The present study was an attempt to investigate the effects of adding plastic waste particles on the engineering properties of concrete. To this end, a mix concrete design was adopted in which pre-defined weight-based amounts of the concrete fine aggregates were replaced by equivalent waste fragments. At all the mixtures, the amount of the coarse aggregate (gravel) and the water–cement ratio remained constant. The results of laboratory tests showed that the added plastic fragments changed both physical and strength-related properties of newly produced concretes. More specifically, physical properties (e.g. density and ultra sound velocity) gradually decreased as the presence of plastic fragment ratios increased. On the other hand, compressive, tensile, and flexural strength of samples rose, when 5–10% of the concrete fine aggregates were replaced by the same percentage of polyethylene terephthalate (PET) fragments. The results also indicated that substitutions greater than 10% cause dramatic decline in all strength-related parameters of the concretes. It is therefore argued that replacement of fine particles with PET fragments may positively affect the strength-related values of the concrete samples provided that as long as the substation rate is under 10%.

The combined effects of waste Polyethylene Terephthalate (PET) particles and pozzolanic materials on the properties of self-compacting concrete

In this study, the combined effects of waste Polyethylene Terephthalate (PET) particles and pozzolanic materials on the rheological, mechanical and durability properties of self-compacting concrete (SCC) are evaluated. The replacement ratios of fine aggregates with the same weight of waste PET aggregates are 5, 10 and 15 weight percent (wt.%). Moreover, the replacement ratio of cement with the same weight of silica fume and fly ash is 10 and 30 wt.%, respectively. The workability of SCC containing waste PET particles was determined using slump flow, V-funnel and L-box tests. Mechanical (compressive, tensile and flexural strengths and modulus of elasticity), rheological (L-Box, slump flow and V-funnel) and durability (water absorption and electrical resistance) properties are assessed. The results show that waste PET particles can be reused as aggregates in SCCs. Use of waste PET in SCC decreases compressive, tensile and flexural strengths. However, pozzolanic materials (fly ash and silica fume) compensate the loss of strength caused by adding PET. The use of waste PET has several advantages. Waste PET has no effect on electrical resistance and decreases the brittleness of concrete. Moreover, waste PET reduces environmental problems, protects natural resources and decreases the dead load of buildings due to its low unit weight.

Flotation characterization of PET and PVC in the presence of different plasticizers

Plastic is one of the most widely used materials in our daily life and industry. Recycling is an important activity in the minimization of waste that results from human activities. Depending on plastics surface characteristics, they can be separated from each other by flotation method which is useful mineral processing technique with its low cost and simplicity. To succeed in a separation of mixed polymers based on polymer type using selective flotation, it is necessary to render one surface more hydrophilic while the others are still in a hydrophobic state. The separation could be achieved with the help of appropriate plasticizer.In this paper, the characteristics of plastics particles and flotation behaviors of polyethylene terephthalate (PET) and polyvinyl chloride (PVC) were studied. The contact angle, liquid surface tension, zeta potential measurements and FITR analysis were performed in order to investigate the effect of plasticizer reagents and the success of froth flotation at plastic recycling. It was observed that contact angle values of PVC were smaller than PET in the presence of lignin alkali (LA) and diethylene glycol dibenzoate (DIB). Both plasticizer render PVC more hydrophilic and cause higher wettability. Therefore, PVC remains in the floatation cell while air bubbles are attaching to PET. At the end of the selective flotation experiments, PET was separated from the mixture of PET and PVC with 97% content and more than 99% recovery when using 25g/t LA as a plasticizer at pH 8. To succeed in a separation of PET from PVC by selective flotation, 250g/t DIB was added into the solution at pH 5 and PET particles were separated from the mixture at 90% content and 95% recovery.

Replacement of Quartz in Cementitious Composites Using PET Particles: A Statistical Analysis of the Physical and Mechanical Properties

AbstractThis work investigates the mechanical behavior of cementitious composites (mortar) when quartz inclusions are totally or partially replaced with polyethylene terephthalate (PET) particles. A full factorial design is performed to identify the effect of the water/cement ratio and the range of quartz particles size used in the replacement on the different mechanical and physical parameters (bulk density, apparent porosity, water absorption, oxygen permeability, compressive strength, and modulus of elasticity). The results show a general reduction of the mechanical properties when the replacement with quartz particles is put in place. The composites made by replacing the coarse quartz particles showed acceptable mechanical properties for nonstructural civil engineering applications, with a significant amount of PET recycling to be used as aggregates for some specific end-user cases.

The Effect of Polyethylene Terephthalate Particle Size and Concentration on the Properties of Asphalt and Bitumen as An Additive

Research is extremely limited on the combination of polymeric materials, such as discarded polyethylene terephthalate (PET), with asphaltic materials indigenous to Trinidad and Tobago. This paper examines the effect of both concentration and particle size of added PET on the rheological properties of Trinidad Lake Asphalt (TLA) and Trinidad Petroleum Bitumen (TPB). The PET particle size ranges under study were &gt;0.30 mm to 0.60 mm, &gt;0.60 mm to 0.85 mm, and &gt;0.85 mm to 1.18 mm. These particle sizes were added in concentrations by weight ranging from 2% to 8% PET for TPB and 2% to 4% PET for TLA. Incorporating the waste polymeric material PET in TLA and TPB influenced the physical properties of the resulting blends. For TLA-PET blends, the largest particle size range produced values of complex shear moduli that were higher than pure TLA. The smallest particle size range had the opposite effect. The optimal concentration for fatigue cracking and rutting resistance occurred at 2% PET with the largest particle size range. For TPB-PET blends, the peak value of complex shear modulus generally occurred at concentrations above pure TPB for all particle size ranges and temperatures tested. As the particle size range increased, these peak values occurred at lower concentrations of PET. The 2% concentration for the largest particle size range provided the best fatigue cracking resistance, whereas the particle size range &gt;0.60 mm to 0.85 mm produced the best rutting resistance. This study demonstrated that incorporating waste PET as an additive in road paving mixtures could improve the overall quality of roads and also be a sustainable waste disposal option. Further research is recommended on the effect of PET particle size range and concentrations on TLA/TPB combinations commonly used in road paving applications along with accelerated weathering studies.

An experimental investigation on the erosion resistance of concrete containing various PET particles percentages against sulfuric acid attack

PET (Polyethylene Terephthalate) is one of the most common plastics for various productions. The rapid increase in the use of these products causes increment in solid waste problems. Eventually, management and prevention of solid waste resulted by urban and industrial waste are dramatically important. On the other hand, deterioration of sewage purification structures, part of industrial structures and concrete sewer pipes attacked by sulfuric acid is an important issue of the world that has communicated with substantial financial need in all countries. Thus, not so many researches has been investigated the effect of sulfuric acid erosion on concrete containing PET particles, this study represents the laboratory investigation of different values of 0%, 5%, 10%, and 15% of PET particles as an alternative aggregate on erosion caused by sulfuric acid in concrete. All samples were cured during 28days, 3 samples from each mix design were tested, finally. In intervals of 15, 30, and 60days of immersion in 5% sulfuric acid, 3 specimens were taken out from sulfuric acid solution. Then, after drying these specimens and measuring their dimensions, crushing load, weight and ultrasonic wave velocity values were obtained. The results showed that by increasing in amount of PET particles as an alternative aggregates in concrete, there is less reduction in values of crushing load, weight loss and ultrasonic wave velocity. Also, it could be seen that ratios of crushing load reduction to weight loss for specimens attacked by 5% sulfuric acid solution were increased by increasing in percentage of PET particles, which illustrates that in a particular range of crushing load, less weight loss was occurred in concretes included more PET particles.

Micro-scratching of polyethylene terephthalate: Mechanisms of wear debris generation

The functional use of polymers is often limited by polymer wear debris particles. This motivates research on the microscopic origin of such debris. The effects of individual hard asperities on the wear of a polymer surface can be tested in micro-scratching experiments. Based on micro-scratching with conical tips, “wall” formation and low-cycle fatigue wear at scratch intersections have been suggested to constitute a major source of debris particles. This proposition and other mechanisms of wear debris generation have been investigated in the present work on polyethylene terephthalate (PET). PET is a ductile polymer for which significant debris generation due to low-cycle fatigue may be expected. A micro-scratcher with a silicon cubic corner tip and different attack geometries were used. A variety of continuous scratching track patterns and repeated cycling of these patterns with up to 40 passes were explored to investigate effects at both, scratch intersections and end-of-track points. The micro-scratch patterns on PET were characterized with scanning electron microscopy and atomic force microscopy. Lumpy corner protuberances, known to occur in PMMA at scratch intersections, have not been observed for PET. While the formation of “walls” at intersections has been confirmed, no wear debris is generated and the “walls” appear to be diminished with increased cycling. Instead, the repeated compression and merger of end-of-track pileups at points of directional change result in long extrusions of PET debris chains. This debris generation mechanism may depend on the geometry of the tip and may be least significant with cylindrically symmetric, conical tips. Under the experimental conditions explored, the debris chain extrusions appear to be the dominant sources of wear debris particles. A sideward component of motion in the directional change at an end-of-track point favors the severing of an extrusion. The severing results in detached debris clusters that can indeed be observed for PET in the vicinity of end-of-track points. The number of merged PET particles in a debris cluster tends to be equal to the number of scratch track passes before the detachment of the extrusion.

Aseptic arthritis after ACL reconstruction by Tape Locking Screw (TLS®): Report of two cases

In Tape Locking Screw (TLS(®)) ligamentoplasty, transplant bone fixation uses polyethylene terephthalate (PET). We report two cases of aseptic arthritis following anterior cruciate ligament (ACL) reconstruction using this material. Diagnosis was founded on negative sampling and complete cure following arthroscopic lavage and synovectomy without curative antibiotherapy. This complication was also described with other synthetic materials used in this indication (Dacron, PFTE, carbon), and with PET as transplant material but never as bone fixation material. The physiopathological hypothesis is in terms of PET particle release in the suprapatellar bursa; sinking the strips into the bone as fully as possible on implantation could avoid impingement. Longer TLS(®) ligamentoplasty series with adequate follow-up will be needed in order to estimate the true incidence of this complication.