Thermal depolymerization mechanisms of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) |
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| Authors: | Hengxue Xiang Xiaoshuang Wen Xiaohui Miu Yan Li Zhe Zhou Meifang Zhu |
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| Affiliation: | State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201621, China;State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201622, China;State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201623, China;State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201624, China;State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201625, China |
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| Abstract: | Thermal degradation processes and decomposition mechanisms of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) were investigated by using thermal gravity analysis(TGA), Gel permeation chromatography (GPC), elemental analyzer, pyrolysis-gas chromatography-mass spectrometry (PyGC-MS) and 1H nuclear magnetic resonance (1H NMR). The degradation activation energy was calculated via the dependence of residual mass on isothermal temperature. 1H NMR and PyGC-MS were used to investigate the chemical structure and component proportion of volatile gases and degradation residues which were produced by thermal decomposition, and to infer the process of macromolecular chain scission. Besides, the influence of the factors, such as outfield atmosphere, residual metal ions, on the degradation behaviors of PHBV was also studied. Finally, the PHBV thermal decomposition mechanisms were speculated on the basis of the degradation behaviors of molecular and chemical structure. |
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| Keywords: | Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) Thermal depolymerization Thermal degradation Biopolymer Polyhydroxyalkanoates(PHAs) |
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