Determination of stereochemical compositions of oligo- and poly(α-methylstyrene)s by 1H and 13C NMR

被引：15
|
作者：
Osa, M [1 ]
Sumida, M
Yoshizaki, T
Yamakawa, H
Ute, K
Kitayama, T
Hatada, K
机构：
[1] Kyoto Univ, Dept Polymer Chem, Kyoto 6068501, Japan
[2] Osaka Univ, Grad Sch Engn Sci, Dept Chem, Toyonaka, Osaka 5608531, Japan
来源：
POLYMER JOURNAL | 2000年 / 32卷 / 04期
关键词：
poly(alpha-methylstyrene); alpha-methylstyrene oligomer; H-1 nuclear magnetic resonance; C-13 nuclear magnetic resonance; 2D nuclear magnetic resonance; gauge-independent atomic orbital method; modified neglect of diatomic overlap method; stereochemical composition; helical wormlike chain;
D O I：
10.1295/polymj.32.361
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A set of oligo- and poly(alpha-methylstyrene) samples were prepared by anionic polymerization, giving particular attention to the polymerization temperature and the initial monomer concentration. The samples were characterized by H-1 and C-13 NMR spectroscopy and also by three kinds of two-dimensional NMR spectroscopy. It is shown that they have almost the same value 0.72 +/- 0.01 of the fraction f(r) of raceme diads independent of molecular weight, indicating that they are adequate for a study of dilute polymer solutions within the new framework of polymer solution science based on the helical wormlike chain model.
引用
收藏
页码：361 / 369
页数：9
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