TRANSESTERIFICATION OF POLY(ETHYLENE TEREPHTHALATE) WITH POLY(ε-CAPROLACTONE)* |
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作者姓名: | Zheng-ping Zhang Xiao-lie Luo Yu-chen Lu De-zhu Ma Department of Polymer Science and Engineering University of Science and Technology of China Hefei 230026 China |
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作者单位: | Zheng-ping Zhang;Xiao-lie Luo;Yu-chen Lu;De-zhu Ma Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei 230026,China |
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基金项目: | This project was supported by the National Natural Science Foundation of China and the National Key Projects for Fundamental Research "Macromolecular Condensed State", The State Science and Technology Commission of China. |
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摘 要: | Transesterification of poly(ethylene terephthalate) (PET) with poly(ε-caprolactone) (PCL) was investigated bymeans of NMR spectroscopy, extraction experiments, differential scanning calorimetry (DSC) and phase contrast microscopy(PCM). The ~1H-NMR results show that transesterification takes place in the melt blends and leads to the formation of thePET-PCL copolyester with a chemical structure similar to ethylene terephthalate-ε-caprolactonc copolycster (TCL)synthesized directly from monomers. However, even in the blend that has been transesterified for 8 h, the random PET-PCLcopolyester, PET-PCL copolyester with long PET or long PCL segments and the unreacted PET and PCL homopolymersmay coexist. Due to the low mobility of PET and PCL chains and the high viscosity of the two macromolecules, thetransesterification proceeds with difficulty. Furthermore, PET is incompatible with PCL, the transesterification can onlyoccur at the interface or in the interfacial region between two phases, and finally the reaction can only reach a localequilibrium. These results indicate that in fact the transesterification in the melt blend between two incompatiblehomopolymers could not lead to the formation of completely random or typical block copolyesters.
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关 键 词: | Transesterification Poly(ethylene terephthalate) Poly(ε-caprolactone) Crystallization Phase structure |
收稿时间: | 1999-09-14 |
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