High‐resolution thermogravimetry of poly(phenylene sulfide) film under four atmospheres

Li, Xin‐Gui; Huang, Mei‐Rong; Bai, He

doi:10.1002/app.10120

Cited by 7 publications

(9 citation statements)

References 22 publications

(6 reference statements)

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“…Therefore, the thermal decomposition of the PES depends significantly on the density and thermal conductivity of the testing atmospheres, besides their reactivity such as oxidative ability from oxygen. Similarly, different activation energy values are also observed for the thermal decomposition of thermoplastic polyimide28 and polyphenylene sulfide24 in the four testing atmospheres. This semiquantitative relationship between the decomposition characteristics of the polymers and the physical properties of the testing atmospheres might be established for the first time.…”

Section: Resultsmentioning

confidence: 71%

“…The decomposition temperature of polyethersulfone determined by the high‐resolution TG in air and nitrogen is higher than that by traditional TG, but the activation energy of the decomposition based on the high‐resolution TG data is much higher than that based on the traditional TG data. The high‐resolution TG/DTG techniques and procedures described here have been satisfactorily used for a quick investigation of the thermal degradation and its kinetics of several heat‐resistance polymers 15, 16, 18, 24, 28. There is a significant relationship between the thermal decomposition characteristics of the polymers and the physicochemical properties of the testing atmospheres.…”

Section: Discussionmentioning

confidence: 99%

“…The sensitivity was fixed at its default value of 1 in a temperature range of 25–790°C. The temperatures and activation energy of thermal degradation were determined using the techniques previously described 12–29. The degradation temperature T d was obtained by extrapolation of the initial degradation portion of the TG curve.…”

Section: Methodsmentioning

confidence: 99%

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High‐resolution thermogravimetry of polyethersulfone chips in four atmospheres

Shao

Bai

et al. 2003

J of Applied Polymer Sci

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Thermal degradation and kinetics of polyethersulfone (PES) chips were studied in air, nitrogen, helium, and argon from room temperature to 790°C by highresolution thermogravimetry (TG) at a variable heating rate in response to changes in the sample's degradation rate. In the four atmospheres, a two-step degradation process in air, argon, and helium or a three-step degradation process in nitrogen of the PES were found in this investigation. In particular, the three-step degradation process in nitrogen of the PES revealed by the high-resolution TG was hardly ever observed by a traditional TG. The initial thermal degradation temperature of the PES increases with the testing atmosphere in the following order: air Ͻ argon Ͻ helium Ͻ nitrogen but the activation energy of the first major degradation of PES increases in a different order: argon Ͻ nitrogen Ͻ helium Ͻ air. The degradation temperature, the temperature at the maximum weight-loss rate, the maximum weight-loss rate [(d␣/dT) m1 and (d␣/dT) m2 ], char yield at 790°C, and activation energy of the first major degradation process obtained by the high-resolution TG were compared with those by traditional TG. The PES exhibits the largest (d␣/dT) m1 and the greatest char yield at 790°C in helium but the largest (d␣/dT) m2 and smallest char yield in air. A significant dependency of the thermal decomposition of the polymers on the physicochemical properties (density, thermal conductivity, and oxidative ability) of the testing atmospheres is elaborated for the first time.

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Section: Resultsmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 99%

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High‐resolution thermogravimetry of polyethersulfone chips in four atmospheres

Shao

Bai

et al. 2003

J of Applied Polymer Sci

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“…Considering PH-50 with polycarbonate soft segments resistant to oxidation, enhanced stability was observed on the contrary. It ought to be explained by the oxidation processes that stabilize hard segments with diphenyl sulfide units [32]. In oxidative atmosphere, both these SPURs and RPUR, decomposed in three stages (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Transparent sulfur-containing thermoplastic polyurethanes with polyether and polycarbonate soft segments

Rogulska

2017

Polym. Bull.

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New thermoplastic polyether-and polycarbonate-based segmented polyurethanes were synthesized by a catalyzed one-step melt polyaddition from diphenyl sulfide-derivative diol, i.e., 2,2 0 -[sulfanediylbis(benzene-1,4-diyloxy)]diethanol as a nonconventional chain extender, 1,1 0 -methanediylbis(4-isocyanatocyclohexane), and 40, 50, and 60 mol% poly(hexane-1,6-diyl carbonate) diol (PHCD) of M n ¼ 860 g=mol or poly(oxytetramethylene) diol (PTMO) of M n ¼ 1000g=mol as soft segments. The structures and thermal properties of the polymers were examined by FTIR, elemental analysis, differential scanning calorimetry, thermogravimetry (TG), and TG-FTIR. Moreover, their Shore A/D hardness, tensile, physicochemical, adhesive, and optical properties were determined. The obtained colorless, transparent, amorphous materials exhibited elastomeric or plastic properties. The PTMO-based polymers showed lower glass-transition temperatures than those based on PHCD (from -29 to 5°C vs. from 11 to 43°C) as well as a higher degree of microphase separation. On the other hand, the polymers with the polycarbonate soft segments revealed better transparency (transmittance at 800 nm: 84-89% vs. 75-82%), higher tensile strength (up to 48.6 MPa vs. up to 28.3 MPa), and hardness in comparison with those with the polyether soft segments. The polymers decomposed in two (in helium) or three (in air) stages and possessed a relatively good thermal stability. Their temperatures of 1% mass loss were contained within the range of 255-274°C. In inert atmosphere, the values shown by polymers from PTMO were higher than those from PHCD, whereas in oxidative atmosphere, the situation was reversed. The newly synthesized sulfur-containing polymers showed a higher refractive index and adhesive strength to copper than analogous polymers based on butane-1,4-diol as a chain extender.

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“…According to the literature, 19,20 According to this schema, one can note clearly that the oxidative degradation process contains main routes which can start from the bond position of C-S or C-H. It is noteworthy that, as the past research, 30,38 the classic oxidative degradation mechanism of PPS can be displayed by the differential equations.…”

Section: Uv Measurementmentioning

confidence: 98%

Multiscale physicochemical characterization of a short glass fiber–reinforced polyphenylene sulfide composite under aging and its thermo‐oxidative mechanism

Zuo

Tcharkhtchi

Shirinbayan

et al. 2018

Polymers for Advanced Techs

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physicochemical characterization of a short glass fiber-reinforced polyphenylene sulfide composite under aging and its thermo-oxidative mechanism.In this paper, the thermo-oxidation for a short glass fiber-reinforced polyphenylene sulfide (PPS/GF) composite was experimentally and theoretically studied by a wide range of physicochemical and mechanical techniques. The accelerated thermal aging temperatures were fixed at 100°C, 140°C, 160°C, 180°C, and 200°C. Firstly, the results of weight loss under aging indicate the formation of volatile products because of chain scission of end groups. Also, Fourier-transform infrared spectroscopy (FTIR) results suggest that the formation and accumulation of carbonyl group arising from the formation of hydroperoxides in oxidative propagation process. In all cases of different thermal oxidation temperatures, it is hard to observe some significant change about the concentration of carbonyl group during the induction time. This induction time depends inversely on the oxidation temperature. Moreover, the cross-linking and chain scissions exist together according to the results of rheological results andit is easier to see the cross-linking phenomenon at the beginning of oxidation while the chain scissions are more pronounced, with the oxidation process developing further. In aspect of mechanical properties, σ max increases at the beginning of oxidation because of cross-linking, and subsequently, the σ max always decreases because of thermo-oxidation of the PPS matrix. In addition, the detailed thermo-oxidation processes are fully discussed in the end of this study. A mechanistic schema has been proposed to present different oxidation reactions of PPS polymer and then a kinetic model has been extracted from this mechanism. Afterwards, the model has been verified by experimental results at different temperatures.

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High‐resolution thermogravimetry of poly(phenylene sulfide) film under four atmospheres

Cited by 7 publications

References 22 publications

High‐resolution thermogravimetry of polyethersulfone chips in four atmospheres

High‐resolution thermogravimetry of polyethersulfone chips in four atmospheres

Transparent sulfur-containing thermoplastic polyurethanes with polyether and polycarbonate soft segments

Multiscale physicochemical characterization of a short glass fiber–reinforced polyphenylene sulfide composite under aging and its thermo‐oxidative mechanism

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