C-13 NUCLEAR-MAGNETIC-RESONANCE STUDY OF POLY(TRANS-4-METHACRYLOYLOXYAZOBENZENE)

被引：6

作者：

SOLARO, R

ALTOMARE, A

机构：

[1] Dipartimento di Chimica e Chimica Industriale, Centro CNR Macromolecole Stereordinate Otticamente Attive, Università di Pisa

来源：

POLYMER | 1990年 / 31卷 / 08期

关键词：

!sup]13[!/sup]C nuclear magnetic resonance; nuclear Overhauser enhancement factor; poly(4-methacryloyloxyazobenzene); relaxation time; stereoregularity;

D O I：

10.1016/0032-3861(90)90143-M

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The 50.3 MHz 13C nuclear magnetic resonance of radically initiated poly(trans-4-methacryloyloxyazobenzene) was studied in CDCl3 solution at room temperature. Resonance assignments were made by comparison with low-molecular-weight structural analogues and from dynamic measurements. Restricted internal rotation of the side-chain azobenzene group was found to be responsible for the splitting of some aromatic carbon signals. The carbonyl, methyl and main-chain quaternary carbons gave rise to multiplets attributable to pentad and triad stereosequences. Their intensity distribution closely fitted Bernoullian statistics (Pm = 0.257) consistent with a predominantly syndiotact structure of the polymer backbone. Molecular dynamics in solution was investigated by measurements of 13C T1 and nuclear Overhauser enhancement factor. © 1990.

引用

页码：1415 / 1418

页数：4

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