Pavel A. Mikhaylov, Marina P. Filatova, Valeriy G. Kulichikhin
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Abstract
In the present study, the macromolecular chain composition of copolymers prepared by the reactive blending of poly(ethylene terephthalate) (PET) and bisphenol A polycarbonate (PC) in the presence of Ti(OBu)4 catalyst was tested using 1 H and 13 C NMR spectroscopy. The NMR spectra were meticulously analyzed across all regions, revealing unexpected results that provide new insights into the transreaction mechanism occurring between these two polymers in the melt phase. It was found that only two primary reactions occurred: the formation of a bisphenol A terephthalate bond accompanied by the release of ethylene carbonate and the formation of an aliphatic–aromatic ether bond with the release of CO2 . The release of ethylene carbonate during the PET-PC blending led to a loss of ethylene glycol (EG). The kinetics of EG loss and ether bond formation were examined. A new transreaction mechanism for PET-PC reactive blending is proposed. © 2024 Society of Chemical Industry.
熔体中聚对苯二甲酸乙酯与双酚A聚碳酸酯反应机理的新认识
在Ti(OBu)4催化剂的存在下，用1H和13C NMR对聚对苯二甲酸乙酯（PET）和双酚A聚碳酸酯（PC）反应共混制备的共聚物的大分子链组成进行了测试。对所有区域的核磁共振光谱进行了细致的分析，揭示了意想不到的结果，为这两种聚合物在熔体阶段发生的反应机制提供了新的见解。结果发现，只发生了两个初级反应：形成双酚a对苯二甲酸酯键，同时释放碳酸乙烯；形成脂肪族芳醚键，同时释放CO2。在PET-PC共混过程中，碳酸乙烯的释放导致乙二醇（EG）的损失。考察了EG损失和醚键形成的动力学。提出了一种新的PET-PC反应共混反应机理。©2024化学工业学会。
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