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Decomposition properties of PVA/graphene composites during melting-crystallization

文献类型： 外文期刊

作者： Li, Chengpeng 1 ; Hou, Tingting 1 ; She, Xiaodong 1 ; Wei, Xiaoyi 2 ; She, Fenghua 1 ; Gao, Weimin 1 ; Kong, Lingxue 1 ;

作者机构： 1.Deakin Univ, Inst Frontier Mat, Waurn Ponds, Vic 3216, Australia

2.Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Chinese Agr Minist Key Lab Trop Crop Prod Proc, Zhanjiang 524001, Peoples R China

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.

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