EO／THF无规共聚醚结构研究（Ⅰ）──端羟基液体共聚醚的NMR分析  

Studies of EO/THF Random Copolyether(Ⅰ)──NMR Analysis for the Liquid Hydroxy Terminated TEO

作　　者：张建国[1] 裴奉奎[1] 吴亦杰 景凤英[1] 张喜田[1] 谭惠民[1] 

机构地区：[1]中国科学院长春应用化学研究所,北京理工大学

出　　处：《高等学校化学学报》1994年第2期290-294,共5页Chemical Journal of Chinese Universities

基　　金：国家八六三项目

摘　　要：用核磁共振技术研究了环氧乙烷（ＥＯ）与四氢呋喃（ＴＨＦ）端羟基液体共聚醚（ＴＥＯ）的链结构，定量测定了ＴＥＯ的结构组成参数以及二元组与三元组序列分布。实验结果表明，端羟基液体ＴＥＯ易形成以Ｅ－ＯＨ为端基的线型无规交替结构，且序列分布随ＥＯ／ＴＨＦ组成比而变化。In this work, the chain structure of the liquid hydroxy terminated TEO was described by 1D￣(13)C NMR and 2D COSY spectroscopies. Some difficulties in recognition of the (13)C spectra of TEO come from the overlap of peaks or small difference for chemical shifts. The assignment of the peaks in (13)C spectra of TEO was discussed deeply with information provided from 2D H-H COSY and C-H COSY experiments. The diads and triads distribut ion were determined by the gated decoupling (13)C NMR spectrum and based on the change of sequence structure with the content ratio of EO/THF. The four peaks in the high field of ￣(13)C NMR spectrum of TEO(50%EO) sample solution in CDCl3, obviously, were assigned to TTT, TTE, and ETE(-CH_2-).In the lower field, the six peaks were identified as ETE(71.12 ppm), TTE(71.08 ppm), TEE 3nd EEE(70.85 ppm), EEE(70.55 ppm), EET(70.55 ppm), TTT(70.52 ppm),TTE (70.52 ppm), TET(70.02 ppm), EET(70.02 ppm). The experiment results indicate that the average functionalities are about 2, and the average alternated degree close to 50 per cent,so, TEO's are copolyether of the random and the alternation.

关 键 词：NMR 无规共聚醚 链结构 共聚醚 

分 类 号：O632.32[理学—高分子化学]