Modified Polyester Fibers Research Articles

Preparation of Antistatic Polyester Fiber via Layer-by-Layer Self-Assembly

Polyester fibers tend to generate static electricity during the weaving and application processes, posing a threat to their production. Enhancing the water absorbency and electrical conductivity of polyester fibers themselves is an effective approach to improving their antistatic properties. In this study, multifunctional chitosan (CS), sodium phytate (SP), and Cu2+ were loaded on polyester fibers through layer-by-layer (LBL) self-assembly. The antistatic and water absorption capability of the modified polyester fibers was investigated by designing different process parameters combined with a surface resistance test and water contact angle tests. The antistatic property test results confirmed the positive effect of CS and Cu2+ on discharging electrostatic charge. Within a definite scope, with the increase in the number of assembly layers, assembly duration, and the concentration of the assembly substances, the wettability of the modified polyester fibers became more favorable and the antistatic effect became more remarkable.

Preparation and properties of polyester fibers with polyacrylamide hydrogel grafted by UV‐irradiation

AbstractIt is widely recognized that polyester (PET) fibers with swelling properties are necessary for advanced applications of PET fibers in waterproof fabrics. This study presented the UV‐initiated methods to graft polyacrylamide (PAM) hydrogel on the surface of PET fibers. In the one‐step method, PET fibers are impregnated with a mixed solution of the photoinitiator benzophenone (BP) and the monomer acrylalkylamine (AM). Then, the PET fiber was directly exposed to UV light. In the two‐step method, PET fibers were first impregnated with a photoinitiator solution to generate BP radicals. Then, the fibers impregnated with a monomer solution before being grafted by UV light. Both two methods ultimately achieve PAM gelation‐modified PET fibers. The chemical composition and surface structure were detected by Fourier transform infrared spectroscopy and scanning electron microscope. The findings demonstrate that the PAM hydrogel was successfully grafted on the PET fibers through one‐step method or a two‐step method. In addition, the properties of the grafted PET fibers were evaluated by grafting yield, contact angle, and swelling test. The study indicated that the modified PET fibers via a two‐step method exhibited a superior grafting yield up to 29.3% (PET‐2n) and 54% (PET‐2) compared to the one‐step technique (PET‐1). It was shown that the grafting efficacy of PET fibers modified by two‐step method is better than one‐step method. The static contact angles of PET fibers by UV‐Induced were all reduced. For instance, the contact angles of PET‐2n were decreased from 115° to 62.9°; and the two‐step modified PET fiber after acetone cleaning (PET‐2) decreased from 115° to 60°. It was suggested that the hydrophilicity of the modified PET fibers significantly increased. In addition, the research shows that the gelation‐modified fibers were all possessed swelling properties.

Preparation, structure and properties of bamboo charcoal and its modified polyester fiber

Bamboo charcoals (BC) are prepared at different pyrolysis temperature (350, 450, 500, 600 and 700 °C) with 2 h residence time and at 15 °C/min heating rates. The biochar yields, thermal stability, molecular groups, surface topography, and pore structure were characterized to explore the effect of pyrolysis temperatures on the characteristics of BCs. The results show that the biochar yield has decreased while the thermal stability of BC has increased with the increasing pyrolysis temperature. With the increase of temperature, C-C and C-H bond of aromatic compounds are enhanced to form stable components. The highest specific surface area and pore volume is obtained in the BC prepared at 500 °C with the value of 40.754 m2/g and 0.04738 cm3/g. The optimum temperature for achieving sufficient structure and good properties in fiber is 500 °C. And then, PET/BC fibers are prepared via melt-blend spinning. The mechanical capacity, thermal behavior, moisture absorption and far infrared emission properties of PET/BC fibers with different BC content have been investigated. It is found that the fiber has most desired comprehensive property with the BC content was 2%. At this composition, the tensile strength of the PET is 3.01 cN/dtex, the moisture absorption increases by 50%. The far-infrared imaging of the fabric shows highly temperatures raise of 44.8 °C within 30 s.

Separation of dye from aqueous solution by a new gravity compression and aeration system

ABSTRACT Filtration is one of the important technologies for separating suspended particles. Under the condition of gravity compression, the filtration density can be increased and the separation effect of suspended particles can be improved. Considering the complex composition and the difficulty in degrading dye in industrial wastewater, a gravity compression aeration system with a modified polyester fibre ball (denoted as MPFB) was evaluated for the separation of dye from water. Congo red azo dye solution (0–40 mg/L) was selected as the model treatment compound. The MPFB was prepared by adjusting the concentrations of alkali (Quality score 0–25%), β-cyclodextrin (0∼80 g/L), reaction temperature (40–90°C), and silane coupler concentration (Concentration fractions 0–0.8%). We used Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) to characterise the MPFB. The separation was affected significantly by adsorption conditions such as MPFB dose and pH. The lower the MPFB dose, the higher the expected adsorption capacity. For the treatment of a dye solution at 500 mg/L, 100% removal was achieved with 48 g/L MPFB, at pH 8 during adsorption under non-circulation aeration. For 24 h of reaction, the system could reach the maximum adsorption capacity of 11.2 mg/g, which followed the pseudo-first order kinetics model and the intraparticle diffusion model. We discovered that circulation aeration provided the best adsorption and electrostatic and hydrogen bonding were the dominant components of adsorption. Overall, the system is a promising technology and has the potential to treat large volumes of dye wastewater.

A method for the process of collagen modified polyester from fish scales waste

In this study, we introduced a novel polymerization method of polyester using collagen peptides derived from fish scale waste. After the extraction process of collagen peptide from fish scales, putting collagen peptide, ethylene glycol and Benzenedicarboxylic acid into a container, and mixing them to form a mixture; heating the mixture for executing an esterification reaction, to product esters and water; heating the esters, and stirring the esters via a mixer; in a specific period, decreasing the pressure in the container for executing a polycondensation reaction; decreasing the pressure in the container to a second pressure, and stirring the esters via the mixer, to produce a collagen modified polyester.Collagen peptides are rich in glycine, proline, and hydroxyproline, and by forming a triple helix structure, such as that of the copolyester, gain better hydrophilicity, antistaticity, and ductility. As a result, the produced collagen modified polyester fiber keeps the characteristics of the traditional polyethylene terephthalate fibers including strength, durability, and resistance to wrinkle and shrink. However, the supramolecular collagen modified polyester containing animal collagen peptides has naturally a soft touch and champagne-like color. Consequently, it can be used as a suitable material for skin-friendly functional clothes with or without additional dying. In brief,•This study introduces a novel method for collagen modified polyester.•Upcycled fish scale waste brings the sustainable benefits of circular economy.•Collagen modified polyester provides a new direction for future technological development in the textile industry.

Facile preparation of a multifunctional superhydrophilic PVDF membrane for highly efficient organic dyes and heavy metal ions adsorption and oil/water emulsions separation

At present, various water pollution problems have attracted extensive attention all over the world. Among them, a large amount of wastewater contains oil-water emulsions, heavy metal ions, organic dyes and other pollutants. Therefore, it is urgent to prepare multifunctional materials that can separate these pollutants. In this paper, superhydrophilicity/underwater superoleophobicity PVDF membrane and superhydrophilicity/underwater superoleophobicity polyester fiber were successfully prepared by deposition of suspension containing montmorillonite, β-cyclodextrin, tannic acid and sodium alginate on the substrate. The modified membrane showed good durability and stability under extreme environmental conditions such as different pH conditions, salt immersion test, ultraviolet irradiation and mechanical wear. he modified polyester fiber membrane can effectively separate oil-water mixture and various oil-in-water emulsions. More importantly, the modified PVDF membrane can effectively adsorb organic dyes and heavy metal ions, filter the mixture of oil, organic dyes and various heavy metal ion solutions, and the separation efficiency is very high. Based on all the advantages mentioned above, this study provides a new idea for the efficient adsorption of organic dyes and heavy metal ions and the efficient separation of oil-water mixtures.

Fire hazard of textile materials based on polyester fibers for rail vehicles

Introduction. Wide application for the arrangement of passenger railcars (curtains, upholstery and covers of chairs and sofas, bedding) is occupied by fabrics made of fire-proof, chemically modified polyester fibers that meet ­foreign requirements. An experimental study of the parameters of fire hazard of such a fire-resistant textiles ac­cording to the Russian requirements to furnish railcars showed the impossibility of achieving normative criteria on the toxicity of combustion products and smoke-forming ability because of the peculiarities of the process of ­thermal decomposition. Therefore, an important task is to conduct a comprehensive research on the feasibility of establishing realistic numerical values of criteria of toxicity of products of combustion and smoke generation. Problem of the issue . A feature of the thermal decomposition of polyethylene terephthalate (PET) is its ability to be in a viscous state at high temperatures. The most effective method of fire protection of PET fibers is chemical modification at the stage of their production due to the introduction of organophosphorus functional compounds in the synthesis process. Wide application in the construction of railcars, flameproof tissue is significantly hampered by their failure to comply with the requirements for smoke generation ability and toxicity index of combustion ­products. Results and discussion . Introduction in the polymer chain of PET retardants that do not affect the conditions of tech­nological processing, possibly with their contents not more than 10 % by mass. This amount of flame re­tardant provides the material’s resistance to ignition and flame spread on the surface, lack of education burning melt, but does not alter significantly the toxicity index of combustion products and the rate of smoke generation. Experimental data on the toxicity of combustion products (the yield of CO and CO 2 in the mode of flaming combus­tion) flame retardant, low flame on the surface of the fabrics, flameproof polyester fibres. A comparison of the results of determination of toxicity index of products of combustion to the results of calculations of the generalized index of toxicity (CIT g ). Conclusions . The criterion value of CIT g (0.75) was established for evaluating the possibility of using textile materi als in railway sleeping railcars, corresponding to the index of toxicity of combustion products from 34 to 52 mg/m 3 (43 mg/m 3 ± 20 %), which indicates the possibility of using fabrics with the index of toxicity of combustion products HCl 50 ≥ 35 mg/m 3 . Proposals have been developed to improve fire safety requirements for textile materials used in passenger railcars.

Effect of modified polyester fiber on early crack and shrinkage of concrete

Effect of modified polyester fiber on early crack and shrinkage of concrete

Modeling of disperse dye adsorption on modified polyester fibers

The results of the research on the ability of adsorption of dye on polyester fibers at a temperature of 98?C are presented in this paper. The fibers were previously modified in aqueous solutions of NaOH, KOH or Al(OH)3. Typically, the dyeing of the fibers takes place at high temperatures and under pressure in the presence of the carrier. Previous processing before adsorption-dyeing, alkali hydrolysis, changes the surface morphology of polyester fibers. Based on dye exhaustion results, it was found that the dye adsorption on modified polyester fibers (degree of exhaustion 18.2 %, for a dye concentration of 200 mg?dm-3 and adsorption time of 5 min) has been bigger than adsorption to unmodified fibers (degree of exhaustion 10 %, for a dye concentration of 200 mg?dm-3 and adsorption time of 5 min). The five-parameter nonlinear model of Fritz-Schlunder is the most efficient in simulating isothermal adsorption of disperse dye on polyester fibers (the correlation coefficient is 0.995). Other adsorption models, Dubinin-Radushkevich, Marczewski-Jaroniec and Hill give poorer results and cannot be used to explain the adsorption of the disperse dye for polyester fibers (the correlation coefficients are 0.891, 0.922 and 0.973, respectively).

Hydrophilic Modified Polyester Based on Waste PET Bottles

In this study, a hydrophilic modified polyester/PET fiber was prepared with waste PET bottles as a raw material. The PET bottles were first pelletized and used as both feed stock and for purified terephthalic acid (PTA) preparation. Glycolysis of PET bottle chips was performed to give purified PTA that was used in copolymer synthesis. Hydrophilic modified polyester was prepared from 5-sodiosulfoisophthalic acid (SIPA) and ethylene glycol, and this was copolymerized with purified PTA. The resulting alkali-soluble modified polyester and PET bottle chips were blended. After hollow spinning and alkali treatment, a good hydrophilic modified polyester fiber was obtained. Rheological properties of the modified fiber were studied, and the effect of alkali treatment on the thermal properties, water absorption, and morphology of the fibers were investigated.

Surface Modification of Polyester Fiber with Perfluorooctyltrimethoxysilane

An excellent modified polyester fiber was prepared via chemical grafting between polyester fiber and perfluorooctyltrimethoxysilane (FAS-17), or silane coupler (KH-570), or Titanate coupler (DN-101) in isopropyl alcohol aqueous solution. Volume ratio of isopropyl alcohol in aqueous solution was 50:50, the mass concentration of FAS-17 is 2%, reacting on polyester fiber modified for 24h at 60 °C, the polyester fiber contact angle to water was 145 °, and the contact angle to peanut oil was 118 °, with excellent performance of amphiphobic property. KH-570 and DN-101 modified polymer fiber to be hydrophobic properties nearly as FAS-17, but modified polyester fiber have no amphiphobic property.

High‐Performance Polypyrrole/Graphene/SnCl2 Modified Polyester Textile Electrodes and Yarn Electrodes for Wearable Energy Storage

AbstractFlexible supercapacitors have potential for wearable energy storage due to their high energy/power densities and long operating lifetimes. High electrochemical performance with robust mechanical properties is highly desired for flexible supercapacitor electrodes. Usually, the mechanical properties are improved by choosing high flexible textile substrates but at the much expense of electrochemical performance due to the nonideal contact between conductive materials and textile substrates. Herein, the authors present an efficient, scalable, and general strategy for the simultaneous fabrication of high‐performance textile electrodes and yarn electrodes. It is interesting to find that the conformal reduced graphene oxide (RGO) layer is uniformly and successively painted on the surface of SnCl2 modified polyester fibers (M‐PEF) via a repeated “dyeing and drying” strategy. The large‐area textile electrodes and ultralong yarn electrodes are fabricated by using RGO/M‐PEF as substrate with subsequent deposition of polypyrrole. This work provides new opportunities for developing high flexible textile electrodes and yarn electrodes with further increased electrochemical performance and scalable production.

Hydrophilic modification of polyester fabric by synergetic effect of biological enzymolysis and non-ionic surfactant, and applications in cleaner production

A significant trend in textile manufacturing is the improvement in cleaner production processes using new biotechnological techniques. The biological enzyme lipase was used to improve the surface hydrophilicity of polyester fabric. The activity of a lipase (triacylglycerol hydrolase, EC 3.1.1.3) from Pichia pastoris and the effects of various parameters were investigated. The surface morphology of the modified polyester fiber was examined using reflectance spectroscopy and scanning electron microscopy. The synergetic effects of lipase combined with each of the five surfactants, namely JFC, AEO-9, HMA-474B, Tween-80, and sodium dodecyl sulfate (SDS), were investigated. The surfactants AEO-9, HMA-474B, and SDS significantly inhibited the lipase activity. Tween-80 decreased the lipase activity slightly. A combination of the non-ionic surfactant JFC and the lipase gave excellent synergy and significantly improved the hydrolysis of polyester fabric. This synergetic technique using a lipase combined with JFC was successfully used in cleaner production in a pilot plant to improve the hydrophilicity of polyester fabric. The moisture regains and the antistatic properties of the modified fabric were clearly improved.

Induced superabsorbency in polyester fiber

Modified polyester fibers are considered as a significant part of the polyester produced throughout the world due to the new properties and also reduced undesirable properties, compared to non-modified polyester fibers. In this study, the modification of polyester fiber properties was evaluated for its superabsorbency. The fibers obtained superabsorbency by their treatment with a special latex prepared by inverse emulsion polymerization. Different polymer latexes based on acrylic acid, sodium acrylate, acrylamide (AM) and 2-acrylamide-2-methyl propane sulfonic acid were prepared using inverse emulsion polymerization. Chemical bond (or hydrogen bond) was formed between the functional groups of the fiber surface and functional groups present in the polymer latex by heating. The modified fibers were characterized by swelling, mechanical, morphological, and thermal measurements. The effect of several modifications of parameters such as latex type, AM content in latex, aquatic-organic phase ratios of latex, modification time and modification temperature on the swelling properties of fibers were investigated. Water absorption of the unmodified fiber was 1.5 g/g which increased up to 75 g/g, significantly. This considerable development in hydrophilic characteristics of polyester fibers has led to water blocking of the fiber. Such modification did not have adverse effects on the tensile properties or thermal resistance of the polyester fiber.

Polyvinylamine modified polyester fibers – innovative textiles for the removal of chromate from contaminated groundwater

A new polyelectrolyte and textile based adsorbent material for the removal of chromate from contaminated groundwater.

Structure and Properties of Novel Modified Polyester Fibers

The structure and properties of the fiber affect its processing and wearing performance of the textile product. There are 3 kinds of novel polyester fibers modified by copolymerization. To make good use of these modified polyester fibers and predict their processing and wearing performance, the structure and properties of the fibers were characterized by cross section, crystallinity, moisture regain, tensile test, DSC and TG. Results show that the 2 of the modified fibers are profiled fibers with lower crystallinity and higher moisture regain. The mechanical properties of the modified fibers are worse than that of the ordinary polyester, but much better than cotton fiber. The modified polyester fibers are more thermal sensitive than ordinary polyester fiber. The heat treatment temperature of them in the textile processing should be controlled more carefully than ordinary polyester fibers.

Study on the Pore Structure of Cotton-Like Polyester Knitted Fabrics

Porous structure of fabric has a significant impact on the fabric functions such as air permeability, water transport and heat retention. In this article, six knitted fabrics with different blend ratio of cotton-like modified polyester fiber and cotton fiber were prepared. Pore sizes and its distribution of the fabrics were measured by CFP-1100-AI pore diameter tester. Porosity of the fabrics was obtained by three ways respectively, namely loop model method, image method and density method. The results show that the pore diameter of blended knitted fabrics presents an asymmetric distribution, that is, the smaller pores have a greater proportion to the total pores than larger pores. There exists an obvious diameter change in the pore size distribution which indicates the transition from intra-yarn pores to inter-yarn pores. Among the 3 test methods for porosity, the porosity obtained by the image method is much smaller than that of loop model method and density method, but its relationship to the fiber blending ratio is consistent with the variation law of fabric air permeability, which indicates intra-loop pores takes greater impact on air permeability of fabrics. The results of present study can play a theoretical guiding role in comfort property design and product development of cotton-like polyester fabrics.

Manufacturing Technique and Property Evaluation of Resilient Nonwoven Fabrics

This study creates the high resilience nonwoven fabrics by using modified polyester fiber. In order to have resilience, the nonwoven fabrics are thermally bonded with various temperatures and the air permeability and mechanical properties of the nonwoven fabrics are then evaluated. The optimum tensile strength of 481 N and resiliency of 26 cm occur when the nonwoven fabrics are thermally bonded at 180 °C, and the optimum tear strength of 276 N occurs when the nonwoven fabrics are thermally bonded at 160 °C.

Preparation and Properties of Kaolin Modified Polyester Fibers

Abstract:Kaolin masterbatch was prepared first, and then three kinds of kaolin modified polyester fibers (100 dtex) which respectively contained kaolin masterbatch 2%(PK2), 4%(PK4), 6%(PK6) were successfully spun. Properties of kaolin modified fibers were discussed. The results showed that kaolin particles were evenly dispersed in polyesters. Breaking strength and Young’s modulus of the kaolin modified fibers were decreased with the increase of the kaolin content; moisture absorption was increased with the increase of the kaolin content; boiling water shrinkage was decreased with the increase of the kaolin content; and kaolin modified polyester fibers have good performance of ultraviolet resistance.

Dyeing Properties of Blends of Wool/Modified Polyester Fibers- Effects of Temperature

Two modified polyester fibers (EDDP and ECDP) are blended with wool and dyed with two different disperse dyes. The effects of temperature on the dye uptake of the modified polyesters and the staining of wool are investigated. Dye uptakes for EDDP and ECDP are greater than that for normal polyester (NPET) over the whole temperature range studied. Deeper shades are obtained on EDDP and ECDP, even when dyeing occurs at the boil. Compared to the wool/NPET blend, staining of wool by disperse dye is significantly reduced when the wool is dyed together with the modified polyesters. Color fastness to washing of shades on the two modified polyesters is poorer than that for NPET. Color fastness to washing on EDDP and ECDP also decreases as the dyeing temperature increases. ' Color fastness of disperse dyes on the wool component dyed with modified polyesters is better than that dyed with conventional polyester.