Solid state 13C nuclear magnetic resonance for polyguanidines

被引：10
|
作者：
Lim, AR [1 ]
Kim, JH
Novak, BM
机构：
[1] Jeonju Univ, Dept Phys, Jeonju 560759, South Korea
[2] N Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA
来源：
POLYMER | 2000年 / 41卷 / 07期
关键词：
structural analysis; NMR spectroscopy; spin-lattice relaxation;
D O I：
10.1016/S0032-3861(99)00431-0
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 structure and variations in dynamic motions of three polyguanidines possessing different side chains were studied by C-13 CP/MAS NMR. From these results, the structures of the polyguanidines were confirmed, and the C-13 spin-lattice relaxation times in the rotating frame were measured. The polyguanidine backbone mobilities were measured as a function of size and chemical make up (aliphatic vs. aromatic). The main-chain carbon of polyguanidine (II) with aromatic side chains has a higher activation energy, 23.12 KJ/mol, than the polyguanidine (1) with aliphatic side chains, 19.76 KJ/mol. Also, the activation energy of the main-chain carbons of polyguanidine (II) and (LII) with aromatic side chains was found to depend on the size of side chains. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：2431 / 2438
页数：8
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