SEGMENTAL DYNAMICS IN A GLASSY POLYELECTROLYTE - SOLID-STATE H-2-NMR

被引：11
|
作者：
SCHAEFER, D
RIETZ, RR
MEYER, WH
SPIESS, HW
机构：
来源：
BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 1991年 / 95卷 / 09期
关键词：
DIFFUSION; GLASSES; MOLECULAR MOTIONS; POLYMERS; SPECTROSCOPY; NUCLEAR MAGNETIC RESONANCE;
D O I：
10.1002/bbpc.19910950924
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The segmental dynamics of a special "ionene" polyelectrolyte, poly[(dimethylimino)decamethylene-tetrafluoroborate]-[-(CH2)10-N+(CH3)2-]n*nBF4-, has been investigated by applying one-and two-dimensional deuteron NMR techniques. Selective deuteration in the methyl groups and in the alpha-, beta- and gamma-positions of the methylene chain allow for investigation of the molecular mobility of each site. Below the glass transition the ammonium groups are essentially static, due to strong Coulombic interactions between the cationic centres, whereas the methylene chains undergo trans-gauche isomerizations. At T(g) the ammonium groups become mobile, and we discuss the coupling of this glass transition process to the local methylene dynamics.
引用
收藏
页码：1071 / 1076
页数：6
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