乙烯—醋酸乙烯酯(EVA)共聚物组成及结构分析

Analysis on the Components and the Constructions of EVA(ethylene-vinylacetate copolymers)

利用 FT-IR、NMR 对 EVA 的组成、序列结构进行分析,结果准确度高,分析过程方便、快速。

This paper introduced the analysis of EVA(ethylene -vinylacetate copolymers)structures.The compn,of EVA were detd.by FT-IR and ~1H-NMR,the sequence distribution and the number-average sequence length in EVA were detd.by ^(13)C - NMR.A few papers described the distribution of branchings in EVA.This thesis got a method to analyze the distribution of branchings in EVA.Using the model compounds such as polyproplylene,α-ethyl hexanel and poly -α-hexene,we obtained the total branchings, ethyl -branching,butyl -branching and long -chain branchings compn,respectively by FT -IR.The number of total branchings obtained by FT-IR agreed with the results from ~1H -NMR.