C-13 NMR-STUDY OF POLY[(-)-METHYL METHACRYLATE]

被引：10
|
作者：
SOLARO, R
ALTOMARE, A
机构：
[1] Dipartimento di Chimica e Chimica Industriale, Centro CNR Macromolecole Stereordinate Otticamente Attive, Universita di Pisa, Pisa
来源：
POLYMER JOURNAL | 1990年 / 22卷 / 06期
关键词：
13c nmr; Nuclear overhauser enhancement factors; Poly[methyl methacrylate; Relaxation time; Stereoregularity;
D O I：
10.1295/polymj.22.497
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Microtacticity and dynamics in solution of radically initiated radically poly[(−)-methyl methacrylate] was investigated by 13C NMR, in different solvents and at different field strengths. Resonance assignments were made from 13C dynamic measurements and by comparison with suitable high and low molecular weight model compounds. The correlation times evaluated from relaxation time (T1) and Nuclear Overhauser Enhancement Factors (NOEF) measurements are in agreement with an isotropic overall tumbling model. The splittings of the carbonyl signal, attributed to pentad stereosequences, allow to determine the main chain stereochemistry (Pm=0.366). © 1990, The Society of Polymer Science, Japan. All rights reserved.
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页码：497 / 501
页数：5
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