Decomposition properties of PVA/graphene composites during melting-crystallization

文献类型： 外文期刊

第一作者： Li, Chengpeng

作者： Li, Chengpeng;Hou, Tingting;She, Xiaodong;She, Fenghua;Gao, Weimin;Kong, Lingxue;Wei, Xiaoyi

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关键词： PVA/graphene composites;Isothermal decomposition;Melting-crystallization;Decomposition kinetics

期刊名称：POLYMER DEGRADATION AND STABILITY （ 影响因子：5.03； 五年影响因子：5.207 ）

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收录情况： SCI

摘要： The thermal decomposition of PVA and PVA composites during the melting-crystallization process is still unclear due to indistinct changes in chemical compositions. Using graphene as a model, the decomposition properties of PVA and PVA graphene composites were systematically analyzed under multiple melting-crystallization cycles. And a series of isothermal decomposition experiments around the melting-crystallization temperature were carried out to simulate the corresponding decomposition kinetics. Based on multiple cycle melting-crystallization, the weight loss of PVA and PVA/graphene composites was successfully quantified. Further morphology investigation and chemical structure analysis indicated that the decomposition was non-uniformly distributed, rendering the possibility of crystallization for PVA and PVA/graphene composites after multiple heating cooling cycles. In addition, isothermal decomposition analysis based on reduced time plot approach and model-free iso-conversional method indicated that Avrami-Eroffev model could well match the decomposition process of the neat PVA and PG-0.3 composite, while the Avrami-Eroffev and first order models could precisely forecast the decomposition of PG-0.9 composite. Both analyses during multiple cycle melting-crystallization and isothermal decomposition demonstrated that graphene served as decomposition accelerator in the whole thermal decomposition process, and particularly the decomposition of neat PVA and PVA/graphene composites was highly related to the band area ratios of C-H and O-H vibrations in Fourier transform infrared (FTIR) spectrum. (C) 2015 Elsevier Ltd. All rights reserved.

分类号： O631.3

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