Morphological consequences of interchange reactions during solid state copolymerization in poly(ethylene terephthalate) and polycarbonate oligomers
Morphological consequences of interchange reactions during solid state copolymerization in poly(ethylene terephthalate) and polycarbonate oligomers
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DOI：
10.1016/j.polymer.2005.05.075
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发表时间：
2005-08
期刊：
影响因子：
4.6
通讯作者：
E. B. Gowd;C. Ramesh
中科院分区：
文献类型：
--
作者：
E. B. Gowd;C. Ramesh
通过高分子量PET的解聚获得聚（对苯二甲酸乙二醇酯）（PET）（IV：0.15dL/g）低聚物。聚碳酸酯（PC）低聚物（IV：0.15dL/g）通过标准熔融聚合程序使用双酚A和碳酸二苯酯在碱性催化剂存在下合成。通过熔融共混化学上不同的PET和PC低聚物来制备不同组成的共混物。以聚酯（PET）和聚碳酸酯（PC）的低聚物为原料，通过固相聚合和酯-碳酸酯交换反应合成了聚对苯二甲酸乙二酯-双酚A碳酸酯共聚物。反应在减压下在低于共混物样品的熔融温度的温度下进行。DSC和WAXS技术表征了共混物的结构和形态，而1 NMR光谱用于监测低聚物之间的交换反应的进展。研究表明，随着固相聚合和交换反应的进行，PET和PC晶相在固相中发生了非晶化。
Poly(ethylene terephthalate) (PET) (IV:0.15dL/g) oligomer was obtained by depolymerisation of high molecular weight PET. Polycarbonate (PC) oligomer (IV: 0.15dL/g) was synthesized by standard melt polymerization procedure using bisphenol A and diphenyl carbonate in the presence of a basic catalyst. Blends of varying compositions were prepared by melt blending the chemically distinct PET and PC oligomers. The copolymer, poly(ethylene terephthalate-co-bisphenol A carbonate) was synthesized by simultaneous solid state polymerization and ester–carbonate interchange reaction between the oligomers of PET and PC. The reaction was carried out under reduced pressure at temperatures below the melting temperature of the blend samples. DSC and WAXS techniques characterized the structure and morphology of the blends, while1NMR spectroscopy was used to monitor the progress of interchange reactions between the oligomers. The studies have indicated the amorphisation of the PET and PC crystalline phases in solid state with the progress of solid-state polymerization and interchange reaction.