PGC-MS鉴别乙烯-辛烯共聚物

Identification of Ethylene-Octene Copolymer by Pyrolysis GC-MS

乙烯-辛烯共聚物与聚乙烯性能、价格差别很大, 但无鉴别二者的检验方法。我们采用裂解气相色谱-质谱(PGC-MS)方法研究这两种聚合物的热裂解产物的组成, 发现两者裂解产物的成分相同, 均为不同碳数的烷烃、烯烃化合物; 但含量有区别, 主要区别在辛烯。乙烯-辛烯共聚物裂解产物中辛烯(C8)的相对含量明显高于聚乙烯, C8 峰可作为鉴别乙烯-辛烯共聚物的特征峰, 据此建立了鉴别两种聚合物的方法, 并在进出口商品检验中得到很好的应用。

A new method for the identification of ethylene-octene copolymer and polyethlene by pyrolysis GC-MS,which could not be distinguished before,was established.The major pyrolysis products were C 6 -C 25 olefine and alkane.The results showed that the chemical constituents of pyrolysis products were similar,but their relative contents were different.The content of octene in ethylene-octene copolymer was higher than that in polyethylene.The octene peak was used as the characteristic peak to identify ethylene-octene copolymer,and its relative content was used for the determination of octene proportion in the copolymer.This method is rapid,simple and has been applied in the identification of ethylene-octene copolymer and polyethene.