Thermogravimetric Tests Research Articles

Evaluation of red mud as oxygen carrier for chemical looping combustion of methane and biomass in fluidized bed

The reaction performance of red mud, which generally contains high amount of Na, as an oxygen carrier for Chemical Looping Combustion (CLC) was evaluated using methane and biomass char as fuel respectively. Effects of reaction temperature and cycles on fuel conversion, particle agglomeration and Na distribution were investigated. Fluidized Bed Thermogravimetric test suggested a stable reactivity during successive redox cycles of the red mud with an oxygen transport capacity of 1.65%. The red mud demonstrates a low reactivity with methane, and a serious agglomeration was found during the fluidized bed experiments with methane due to the further reduction of Fe2O3 to its low state of FeO. It has enough reactivity to oxidize the char gasification productions, thus accelerating the char conversion. The average values of the instantaneous rate increase by 2.82 times at 1143 K, 3.88 times at 1163 K, 3.58 times at 1183 K and 2.0 times at 1203 K in comparison with inert gasification process. Almost no agglomerates formation was found for the CLC investigation using biomass char as fuel. Irrespective of the CLC process of methane or the biomass char, Na exists in a stable phase of NaAlSiO4 with a high melting point and has no influence on particle agglomeration.

Effect of a Powder Mould in the Post-Process Thermal Treatment of ABS Parts Manufactured with FDM Technology.

The post-process thermal treatment of thermoplastics improves their mechanical properties, but causes deformations in parts, making them unusable. This work proposes a powder mould to prevent dimensional part deformation and studies the influence of line building direction in part deformations in a post-process thermal treatment of 3D printed polymers. Two sets of ABS (acrylonitrile butadiene styrene) test samples manufactured by fused deposition modelling (FDM) in six different raster directions have been treated and evaluated. One set has been packed with a ceramic powder mould during thermal treatment to evaluate deformations and mould effectiveness. Thermogravimetric tests have been carried out on ABS samples, concluding that the thermal treatment of the samples does not cause degradations in the polymeric material. An analysis of variance (ANOVA) was performed to study internal building geometry and mould influence on part deformation after the thermal treatment. It can be concluded that powder mould considerably reduces dimensional deformations during the thermal treatment process, with length being the most affected dimension for deformation. Attending to the length, mould effectiveness is greater than 80% in comparison to non-usage of moulding, reaching 90% when the building lines are in the same direction as the main part.

Thermal Stability of Nanosilica-Modified Poly(vinyl chloride).

The thermal stability of PVC with 1 wt % of spherical porous nanosilica, prepared by roll milling at processing time varied from 1 to 20 min, was investigated by means of visual color changes, Congo red, and thermogravimetric tests (TGA and DTG), as a function of rolling time and composition of PVC matrix. The melt flow rate (MFR) measurements were realized to identify the degradation-induced changes of processing properties. A high level of gelation of the PVC matrix for all samples was verified by DSC (differential scanning calorimetry). It was found that the addition of porous nanosilica to absorb a certain volume of HCl, produced by dehydrochlorination reaction, leads to an improvement of thermal stability, an effect observed in a form of minor color changes of the samples, lower evolution of gas hydrogen chloride, and slight changes of the MFR value. It was demonstrated that the TGA measurements are not sufficiently sensible to detect the degradation of PVC at the processing conditions, i.e., at the temperature equal to 220 °C and below this temperature.

Study on the Thermal Stability of Urea‐Formaldehyde Resin Microcapsules with Nanosilica Incorporation by Molecular Dynamics Simulation and Experiments

AbstractIt is an innovation to self‐heal the microdefects inside materials by doping microcapsules. Urea‐formaldehyde resin (UF) microcapsule is widely used in self‐healing materials owing to its excellent mechanical properties. However, when it is used in electrical insulation materials, the thermal stability of the microcapsules need to be enhanced owing to the relatively high internal temperature of the material under the long‐term action of electric field. In this paper, molecular dynamics simulation is used to calculate the properties related to the thermal stability of UF microcapsule with and without nanosilica incorporation. The simulation result shows that incorporating nanosilica can increase the density and glass transition temperature, decrease the fractional free volume of UF materials. The UF microcapsules with and without nanosilica incorporation are prepared experimentally, and thermogravimetric test result shows that incorporating nanosilica can enhance the thermal stability of UF microcapsule; scanning electron microscope result shows nanocomposite microcapsule has more UF debris adhered on its surface. By establishing the interface model of UF and nanosilica to explore the internal mechanism, it is found that the interface interaction between UF and nanosilica is conducive to enhancing the thermal stability of UF material.

Oxidation Behavior and Kinetics Parameters of a Lean Coal at Low Temperature Based on Different Oxygen Concentrations

The method of dividing the “three zones” of spontaneous combustion in goaf by oxygen volume fraction is the most widely used and effective method at present. However, the oxygen volume fraction method does not consider the influence of methane concentration in goaf, which is only applicable to low-gas goaf, not high-gassy goaf. In this work, the oxidation behavior and kinetics parameters of a lean coal at low temperatures under five different oxygen concentrations, including methane and its kinetics during low-temperature oxidation, were studied using temperature programming tests and thermogravimetric tests. The results showed that the decrease of oxygen content improves the adsorption capacity of coal to absorb different atmospheres at the initial stage. In the whole reaction process, there is a negative correlation between the strong-to-weak order of exothermicity and adsorption capacity, with a significant increase in apparent activation energy E. A marked hysteresis of the precipitation time of CO and CO2 and a decrease in their precipitation amount and a rise in the initial temperature for the generation of CO and CO2 were found.

Study on the antibacterial properties of two novel isomorphic sandwich tungsten oxide cluster compounds by two-dimensional infrared correlation spectroscopy

Two new tungsten oxide clusters compounds on Na1, and through the OW16···O7 (2.988Å) hydrogen bond connect into a three-dimensional network structure. We conducted infrared tests, thermogravimetric tests and two-dimensional infrared correlation spectroscopy tests on compounds 1 and 2, and set up control experiments to test the inhibitory effects of two compounds on two common pathogenic bacteria E. coli and Staphylococcus aureus in life, combined with two-dimensional infrared correlation spectroscopy (2D-IR COS) and thermogravimetric analysis, the sandwich-type compound 1 and compound 2 with the same configuration, the polarizability of Mn and Cu have a greater impact on the overall configuration, which may be directly lead to the different antibacterial effects of the both. Experimental tests and analysis show that the transition metals in the compound have a close influence on the inhibition of S. aureus.

Highly Proton Conductive Sulfonyl Imide Based Polymer Blended from Poly(arylene ether sulfone) and Parmax-1200 for Fuel Cells.

Thermally and chemically stable, sulfonyl imide-based polymer blends have been prepared from sulfonimide poly(arylene ether sulfone) (SI-PAES) and sulfonimide Parmax-1200 (SI-Parmax-1200) using the solvent casting method. Initially, sulfonimide poly(arylene ether sulfone) (SI-PAES) polymers have typically been synthesized via direct polymerization of bis(4-chlorophenyl) sulfonyl imide (SI-DCDPS) and bis(4-fluorophenyl) sulfone (DFDPS) with bisphenol A (BPA). Subsequently, SI-Parmax-1200 has been synthesized via post-modification of the existing Parmax-1200 polymer followed by sulfonation and imidization. The SI-PAES/SI-Parmax-1200 blend membranes show high ion exchange capacity ranging from 1.65 to 1.97 meq/g, water uptake ranging from 22.8 to 65.4% and proton conductivity from 25.9 to 78.5 mS/cm. Markedly, the SI-PAES-40/SI-Parmax-1200 membrane (blended-40) exhibits the highest proton conductivity (78.5 mS/cm), which is almost similar to Nafion 117® (84.73 mS/cm). The thermogravimetric analysis (TGA) and Fenton's test confirm the excellent thermal and chemical stability of the synthetic polymer blends. Furthermore, the scanning electron microscopy (SEM) study shows a distinct phase separation at the hydrophobic/hydrophilic segments, which facilitate proton conduction throughout the ionic channel of the blend polymers. Therefore, the synthetic polymer blends represent an alternative to Nafion 117® as proton exchangers for fuel cells.

Microencapsulated bio-based phase change material-micro concrete composite for thermal energy storage

The quest and interest shown towards developing organic phase change materials (PCMs) for thermal energy storage (TES) applications in buildings are gaining momentum in recent years. From this perspective, the present study aims at developing a novel microencapsulated bio-based phase change material (MbP) integrated in to a micro concrete composite (MbPMC) for thermal energy storage in buildings. The MbP and MbPMC were experimentally characterized in terms of their morphological, thermal and structural properties. The surface morphology results signified that, the as-prepared MbP particles being formed were near-spherical in shape with sizes ranging between 2 μm and 10 μm. The highly crystalline nature of the bio-based PCM chains and the amorphous structure of the shell material were confirmed through the X-ray diffraction analysis. The Fourier transform infrared (FTIR) spectra has further confirmed the chemical stability between the core (PCM) and the shell material. The MbP has exhibited congruent phase change behavior with a good latent heat potential of 47.31 J/g. Besides, the MbP was found to be thermally stable, commencing from the operating temperature of 35 °C up to 150 °C, as confirmed through the leakage and thermogravimetric tests. A unique and optimized sequential operation of mixing the ingredients for preparing MbPMC matrix was established with a view to obtain the best end product. The as-prepared MbPMC has exhibited adequate structural integrity with a compressive strength of 38.78 MPa at a MbP dosage of 0.075% by the weight of cementitious materials added in the mix. Ultrasonic pulse velocities (UPV), along the directions orthogonal to the direction of pour of the concrete specimens, were observed to be very close, thus proving that the densities, across the cross section of the specimen are more or less uniform. For incremental dosages of MbP, the trend observed in the indicative compressive strengths of MbPMC specimens from rebound hammer tests was observed to be similar to the trend observed in the compressive strength values obtained from the compressive testing machine (CTM). In total, these test results have revealed the ability and stability of the MbP incorporated micro concrete composite (MbPMC) for achieving thermal energy storage and passive cooling in buildings without sacrificing its structural integrity.

Effect of Nanoclay in the Mechanical and Thermal Behaviour of Glass Fibre Reinforced Epoxy

This work investigates the effect of nanoclay in the mechanical and thermal characteristics of GFRP laminates. The Cloisite 15A nanoclay has added to the matrix with proportion of 1%, 2% and 3% by weight. The processed nanocomposites are characterized with X-Ray Diffraction to identify the inter layer spacing of clay in the matrix. The filler added epoxy, reinforced with the unidirectional glass fibre by hand layup technique and the specimens are tested for tension, hardness, flexural and fracture loadings. Dynamical mechanical analysis and thermo gravimetric tests are also conducted to understand the visco-elastic and thermal behaviour of the material. The addition of clay in the matrix generally increases the mechanical properties up to our consideration that is 3% clay loading. Thermal and visco-elastic behaviour found consistent up to 1% clay loading and reduces the performance after that in overall sense.

Preparation and characterization of microencapsulated aluminum hypophosphite and its performance on the thermal, flame retardancy, and mechanical properties of epoxy resin

AbstractA novel microcapsule flame retardant microencapsulated aluminum hypophosphite (MAHP) was introduced. Fourier transform infrared spectroscopy, scanning electron microscopy, and x‐ray photoelectron spectroscopy were used to characterize the shell material on the surface of MAHP. The water contact angle (WCA) experiments show that the WCA of MAHP (71.4°) is significantly larger than that of aluminum hypophosphite (34.4°). And the interfacial free energy between MAHP and epoxy resin (EP) is only 7.89 mJ/m2, which results in good compatibility with EP. The results from differential scanning calorimeter test indicate that the addition of MAHP can improve the heat resistance of EP matrix. Thermogravimetric (TG) tests show that EP/MAHP has the largest amount of residue (32.03 wt%). The combustion behaviors of flame‐retardant EP (FR‐EP) composites were evaluated by limiting oxygen index, UL‐94, and cone calorimetry. The results show that the microencapsulation to AHP in this study can significantly improve the flame retardancy of EP. Thermogravimetric infrared analysis was used to investigate the gas‐phase products. Surface morphology and structure of char residues of EP and FR‐EP was also studied. The carbon layer became quite dense and continuous when MAHP was added. On the premise of improving the flame retardancy, the mechanical properties of the material are retained. The tensile strength and bending strength of EP/MAHP‐3 were 23.98 and 50.75 MPa, respectively.

Enhanced anti-biofouling ability of polyurethane anti-cavitation coating with ZIF-8: A comparative study of various sizes of ZIF-8 on coating

Biofouling and cavitation erosion are the key important factors causing the degradation and fatigue failure of metal materials in seawater. Herein, a series of polyurethane (PU) /ZIF-8 (PHZ) composite coatings were successfully synthesized with different sizes of ZIF-8 nanoparticles (NPs) for antifouling property combined with cavitation erosion resistance. The morphology and structure of the PHZ composite coatings were characterized by XRD, ATR-FTIR, SEM and AFM. The static water contact angle, dynamic mechanical analysis and thermo gravimetric tests further confirmed that the ZIF-8 NPs could improve the hydrophobic, mechanical and thermal properties of the PU coatings. Importantly, the effect of the ZIF-8 NPs with different sizes on the performance of the PHZ coatings was also investigated. The PHZ1 coating with the ZIF-8 NPs (~50 nm) displayed the highest static water contact angle (105°), the largest tensile strength (6.78 MPa) and the best thermal stability among these PHZ coatings. The antifouling properties of the PHZ coatings were also tested against marine diatom (Nitzschia closterium). Especially, the biofouling attachment rate of the PHZ1 coating was 0.51%, which was far less than that of pure PU coating (92%). Moreover, the mass loss of the PHZ1 coating was only 8.9 mg after cavitation test for 24 h. Notably, both antifouling and anti-cavitation properties of the PHZ coatings were inversely proportional to the particle size of the ZIF-8 NPs. The present study offers a simple and green coating technology that combines the antifouling and anti-cavitation to promote the development of ZIF/PU nanocomposite systems for practical applications.

Study on aging of lignin modified asphalt under thermogravimetric conditions

In order to study the aging process of lignin-modified asphalt and explore the effect of lignin on the anti-aging performance of base asphalt, 4 sets of lignin-modified asphalt were prepared under different base asphalt, different dosage, temperature and time. Based on the thermal oxidation test (TFOT), dynamic shear rheological test (DSR), thermogravimetric test (TG), and infrared spectroscopy micro-performance test (FTIR), the high-temperature rheological properties and performance of aging lignin-based asphalt with different content were investigated. The changing law of the chemical properties of functional groups. The results show that the addition of lignin to the base asphalt sample increases the complex shear modulus G* and decreases the phase angle δ compared to the base asphalt sample prepared by the same sample preparation process. In the same sample, with the continuous increase of the test temperature, the complex shear modulus G* of the matrix asphalt before or after aging and the modified asphalt with different content of lignin showed a downward trend. The modification mechanism of lignin on asphalt is essentially that lignin decomposes and reacts with oxygen in the process of thermal oxidative aging, which delays the oxidation reaction of asphalt during aging, so as to achieve the anti-aging effect of asphalt.

ФИЗИКО-ХИМИЧЕСКИЕ ПРЕВРАЩЕНИЯ ГИБРИДНОЙ ПОЛИУРЕТАНО-НЕОРГАНИЧЕСКОЙ ТЕПЛОИЗОЛЯЦИИ ПРИ НАГРЕВАНИИ НА ВОЗДУХЕ И В ИНЕРТНОЙ АТМОСФЕРЕ

Purpose. The article presents the results of a study of physicochemical processes occurring when a hybrid polyurethane inorganic thermal insulation is heated under dynamic conditions up to 800 °C in different atmospheric environments. The object of the study was an industrial sample of thermal insulation “FoamTech 1 550” made in South Korea. Methods. In the course of the work thermo-gravimetric analysis and IR-Fourier spectrometry were used. Samples for spectrometric analysis were prepared in the process of thermogravimetric tests by suspending the experiment. Findings. As the result of the combined studying hybrid thermal insulation material by thermogravimetry and IR-Fourier spectrometry methods, the following was established: – polyisocyanate used for obtaining the material is aliphatic in nature; – the hybrid thermal insulation sample contains about 40 % inorganics, presumably aerogel silica; – there are three main stages of hybrid thermal insulation decomposition, both in air and in an inert atmosphere; – analysis of the changes in IR spectra when heating the hybrid sample showed that at the first stage of decomposition, regardless of the atmospheric environment, the condensation reaction of silanol groups of silica aerogel takes place with the water release; – at the second stage, thickening of the inorganic framework continues, chemical polyurethane bonds with the inorganic are destroyed, and polyurethane component carbonization begins. Research application field. The results give the idea of material decomposition process in a fire. Differences in behavior in oxidizing and inert environments are shown. This is important for comparing a new group of materials with the already known types of polymer thermal insulation in terms of their fire hazard and possible application in building construction. Conclusions. The paper studies the chemical structure and physicochemical changes when heating the new group of materials, namely hybrid organic-inorganic thermal insulation materials. The article is a continuation of a team of authors’ systematic study of a thermal behavior of modern types of polymer thermal insulation.

Spectroscopic and thermogravimetric studies of homogeneous materials from PU/PMMA/SiO2

Polymers of organic-inorganic origin are incompatible by nature and a proposal to solve this behavior is the formation of Interpenetrated Polymeric Networks (IPN) using coupling agents. Coupling agents make it possible to create a crosslinking between the phases present that provides better mechanical, optical and thermal properties. These materials are known as Hybrid Networks. To obtain optically transparent materials, individual networks of Polyurethane (PU), Methyl Polyacrylate (PMMA) and Silica (SiO2) were used. Binary and ternary networks were synthesized using bulk polymerization incorporating SiO2 up to 10% by weight. In this research, coupling agents such as Trimethoxysilyl Propyl Methacrylate (MSMA) and Isocyanotopropyl Triethoxy Silane (IPTS) were introduced to the ternary networks in order to reduce the phase separation that occurs in these systems. Fourier Transform Infrared Spectroscopy (FTIR) studies demonstrated the presence of functional groups of binary and ternary networks. On the other hand, the thermogravimetric tests (TGA) carried out on hybrid IPN´s with coupling agents, presented greater thermal stability and better optical properties, providing the new IPN´s with the opportunity to have promising applications.

Effect of coactive influence of LDHs and PNCC on thermal and mechanical properties of epoxy resin

ABSTRACT The nanofiller improve the properties of the pristine polymer resins to the great extent. In present findings, the preparation of nanocomposites (epoxy/PNCC/LDHs) was done by the ‘Slurry-compounding method’. Precipitated nano-calcium carbonate (PNCC) were mixed with Layer double hydroxides (LDHs) in varying ratio and added to epoxy resin with constant stirring at room temperature. The degree of distribution of the nanofiller and the kind of polymeric nanocomposites formed was observed by Wide-angle X-ray Diffraction, and Scanning Electron Microscopy. The thermal and mechanical properties of epoxy nanocomposites were characterised by Thermogravimetric analysis and Universal Testing Machine, respectively. However, harmonisation and coactive influence of PNCC with LDHs showed a better effect on the mechanical and thermal properties of epoxy resin and offers superior mechanical and thermal properties as compared to pristine epoxy resin and two-component ( Epoxy/PNCC) nanocomposites.

Pyrolysis characteristics and products distribution of petroleum sludges

ABSTRACT Pyrolysis can realise the harmlessness, reduction and resource utilisation of petroleum sludge in a short period. In the present work, a tank bottom sludge (SSOS) and a landing sludge (SLOS) from Shengli Oilfield were used for experimental research. Thermogravimetric testing is used to initially determine the optimal range of pyrolysis temperature. Pyrolysis experiments were performed in a tube furnace reactor. Pyrolysis products were collected and analysed separately. The char yield of SSOS and SLOS were 50% and 70%, respectively. Although there are differences in the oil content of the two types of petroleum sludge, the oil yield remained nearly the same, which were both between 7% and 8%. As the pyrolysis temperature was raised to 500°C, the yield of each product did not change greatly while their composition had obvious changes. High temperature is more conducive to the production of small molecule products. Result showed that pyrolysis treatment of petroleum sludge can effectively recover energy materials in the form of pyrolysis gas and oil. The heating value of char is lower than that of petroleum sludge, which means that char is not suitable for direct use as fuel. Pyrolysis treatment also showed good curing effect on Cr, which reached 85%. However, the solidification effect decreased as pyrolysis temperature increasing. It is necessary to pay attention to the heavy metal contained in char as soil improver. The rich surface structure of char provides evidence to produce high value-added carbon materials.

The kinetics of intumescent flame retardant foaming

Introduction. Intumescent flame retardants are intensively used as passive fire protection means. Under fire conditions, these coatings foam and turn into coke, which turns into ash. These products have various fire resistant properties. These transformations are possible due to the foaming process, whose kinetics determines the fire protective characteristics of the compositions used. The paper considers the kinetics of the foaming process in the course of the pyrolysis of four different foaming compositions. The classical triad was used as a thermally expanding agent for the three of them, it includes ammonium polyphosphate, pentaerythritol, and melamine, and the fourth one has intercalated graphite.Research methods. Thermal analysis is widely used to identify and study various materials, substances and fire retardants. However, we have not found any kinetic studies performed using methods of thermal analysis in the literature. In this work, methods of non-isothermal kinetics are used to identify the mechanism of foaming. For this purpose, four series of thermogravimetric tests were carried out at different heating rates for each composition under study. The results of the experiment made it possible to solve inverse and direct kinetic problems and identify mechanisms of the processes.Results and discussion. Methods of non-isothermal kinetics were employed to show that low-temperature stages of thermolysis can be considered as gross-one-stage processes for all samples. The solution of the direct kinetic problem has helped to identify that the limiting foaming stage is described by the Avrami – Erofeev equation for all compositions under study, while the values of kinetic parameters differ significantly. Consequently, foaming proceeds are similar for samples having different compositions. The foaming of the sample containing intercalated graphite depends on heating conditions.Conclusions. It was identified that the studied compositions transform into the viscous-fluid state at high temperatures. In this case, the limiting stage of the foaming process is the nucleation of primary bubbles in the volume of the liquid phase. This process determines the kinetics of foaming, coke properties and its thermophysical characteristics.

Investigation on the urea deposit formation and thermal decomposition characteristics in the SCR aftertreatment system of a diesel engine

Selective catalytic reduction is the most efficient and reliable equipment for NOx control in current diesel engines. However, the issue of urea crystallization becomes increasingly serious with the implement of the new emissions standards. In this paper, urea deposit samples collected from engine test bed and tube furnace were characterized by thermogravimetric analysis and Fourier transform-infrared analysis to aid the comprehension of urea deposit formation. Moreover, thermogravimetric tests were conducted to disclose the effects of catalyst on the thermal decomposition processes of urea deposit. The results indicated that less temperature resistant species are formed in the engine test bed than in the tube furnace at conditions with the same temperatures. The main compositions in the World Harmonized Transient Cycle (WHTC) urea deposits are urea, cyanuric acid (CYA) and ammelide, implying that accelerating the decomposition of these species could prevent the accumulation of urea deposit. CuWTi, Cuβ and CuZSM catalysts could lead to increased yield of CYA during pure urea thermolysis. Cuβ, CuWTi and VWTi catalysts tend to promote the thermolysis of CYA while VWTi has the most significant catalytic effects on the thermal decomposition of ammelide and ammeline.

Breakdown failure analysis of 220 kV cable joint with large expanding rate under closing overvoltage

The silicone rubber is subjected to either the mechanical stress or the pulse voltage, making it is easier for initiation and development of electrical tree, which is the main reason for breakdown failure of cable joint. Studying the effect of electrical tree for breakdown failure of cable joint is the valid way to ensure the safety and stability of the cable system. In this paper, a breakdown failure case of 220 kV integral prefabricated silicone rubber cable joint with large expanding rate under closing overvoltage is discussed. Through dissection, it was found that there were electric trees inside the cable joint produced by factory C. Based on the failure characteristics, the mechanical stress model of the cable joint and the closing overvoltage model of the system were established to analyze the influencing factors of electric trees. Furthermore, some sample tests were carried out to discuss the relationship between material performance and electrical tree, including carbon black test, gel content test, thermogravimetric test, tensile test and volume resistivity. The results showed that the large circumferential stress would destroy the physical crosslinking of silicone rubber, leading to a decrease in tensile strength and volume resistivity. This was the main factor affecting the growth of electrical trees. Meanwhile the overvoltage and the poor material characteristics of cable joint would accelerate the growth rate of electrical trees. Eventually the breakdown failure of cable joint occurred when the electric trees running through both polarities. The analytical method and conclusions proposed in this paper can provide suggestions and guidance for the analysis of similar breakdown accidents in the future.

Evaluation of the Mechanical Behavior of Bisphenol-A Polycarbonate after Thermal Degradation

This work investigates the mechanical behavior of a PCLIGHT type of polycarbonate (PC). PC samples display interesting results after thermal degradation at different temperatures. Samples of PC in sheet form were exposed for a period of 5 hours at temperatures of 50, 100, 150 e 200°C. After, thermogravimetric test, flexural, impact and tensile tests were performed. The results show that the samples treated at 200oC have their mechanical performance affected. This indicates that the temperature acts on the PC embrittlement behavior. Thus, it can be inferred that temperatures above 150oC can negatively influence the mechanical behavior of the polycarbonate indicating that this material should not be used in association with high temperatures.