聚碳酸酯自然老化的红外光谱研究

摘要

Selecting three areas(Beijing, San Ya, Ruoqiang) to do natural exposure experiment for polycarbonate(PC), using FTIR as the main detection method, some key factors to the outdoor natural aging mechanism of PC was discussed, including the substituted types of the conformations of PC(trans-cisor or trans-trans), hydroxyl index, carbonate carbonyl index, oxygen correntration and solar irradiation wavelength. The results showed that in the process of outdoor natural aging of PC, the photo-oxidative degradation was considered to be the major mechanism, while the photo-fries rearrangement was an auxiliary one.%选取3个不同地区(北京、三亚、若羌)分别对聚碳酸酯(PC)进行自然暴晒试验,利用傅立叶变换红外光谱(FTIR)技术研究分子构型(反式-反式或反式-顺式)、羟基指数、羰基指数、氧气浓度及太阳辐照波长对PC户外自然老化机理的影响.结果表明,PC在户外自然老化过程中,PC以光氧老化途径为主,以光-弗里斯重排途径为辅.