甲基丙烯酸甲酯-甲基丙烯酸正丁酯均聚共混物和无规共聚物的裂解色谱定量分析

Quantitative Analysis of Homopolymer Blends and Random Copolymers of Methyl Methacrylate with n-Butyl Methacrylate by Pyrolysis-Gas Chroma- tography

聚甲基丙烯酸酯类是被广泛应用于工业、建筑、医疗等方面的一类塑料。人们曾经用多种方法对这类材料进行过分析和研究。甲基丙烯酸甲酯(MMA)-甲基丙烯酸正丁酯(BMA)共聚物和均聚共混物的裂解色谱鉴别和定量测定已有报道,但这些方法比较烦琐,不易做准,有的还不完善。本文对聚甲基丙烯酸甲酯(PMMA)-聚甲基丙烯酸正丁酯(PBMA)共混物(简称共混物)和MMA-BMA无规共聚物(简称共聚物)进行了裂解色谱定量研究,探讨了采用回归分析作出的工作曲线的定量方法。

A method using the calibration curves for determination of homopolymer blends and random copolymers of methyl inethacrylate with n-butyl methacrylate by pyrolysis-gas chromatography is presented. The calibration curves were established by using samples of homopolymer mixtures of known compositions. This method was simple and convenient. The precision was good, and the standard deviation was less than 2% in the range of 4-95wt% for n-butyl methacrylate. A technique to distinguish homopolymer blends from copolymers simply and exactly is also presented.