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Kinetic Study of the Thermal and Thermo-Oxidative Degradations of Polystyrene Reinforced with Multiple-Cages POSS

机译:用多笼加固聚苯乙烯热和热氧化降解的动力学研究

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摘要

A comprehensive kinetics degradation study is carried out on novel multiple cages polyhedral oligomeric silsesquioxane (POSS)/polystyrene (PS) composites at 5% (w/w) of POSS to assess their thermal behavior with respect to the control PS and other similar POSS/PS systems studied in the past. The composites are synthesized by in situ polymerization of styrene in the presence of POSSs and characterized by 1H-NMR. The characteristics of thermal parameters are determined using kinetics literature methods, such as those developed by Kissinger and Flynn, Wall, and Ozawa (FWO), and discussed and compared with each other and with those obtained in the past for similar POSS/PS composites. A good improvement in the thermal stability with respect to neat polymer is found, but not with respect to those obtained in the past for polystyrene reinforced with single- or double-POSS cages. This behavior is attributed to the greater steric hindrance of the three-cages POSS compared with those of single- or double-cage POSS molecules.
机译:综合动力学降解研究在多种笼式多面体低聚体倍半硅氧烷(POSS)/聚苯乙烯(PS)复合材料中进行,以5%(w / w),以评估其相对于控制PS和其他类似的热行为/ PS系统过去研究过。通过在足够的存在下通过苯乙烯的原位聚合来合成复合材料,其特征在于1H-NMR。使用动力学文献方法确定热参数的特性,例如由基辛格和Flynn,Wall和Ozawa(FWO)开发的动力学文献方法,以及彼此讨论和与过去获得的那些相比和相似的相似性/ PS复合材料。发现了相对于纯聚合物的热稳定性的良好改善,但对于用单件或双足碱的聚苯乙烯加强的聚苯乙烯而言,不适用于聚苯乙烯的热稳定性。这种行为归因于与单件或双笼相比,三笼的较大的三封闭障碍。

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