HIGH-FREQUENCY DIELECTRIC-RELAXATION MEASUREMENTS OF SIDE-CHAIN DYNAMICS OF BRANCHED CHITOSAN DERIVATIVES IN AQUEOUS-SOLUTIONS

被引：9

作者：

BORDI, F

CAMETTI, C

PARADOSSI, G

机构：

[1] UNIV ROMA LA SAPIENZA,DIPARTIMENTO FIS,I-00185 ROME,ITALY

[2] UNIV ROMA TOR VERGATA,DIPARTIMENTO MED INTERNA,SEZ FIS MED,ROME,ITALY

[3] UNIV ROMA TOR VERGATA,DIPARTIMENTO SCI & TECNOL CHIM,ROME,ITALY

来源：

MACROMOLECULES | 1993年 / 26卷 / 13期

关键词：

D O I：

10.1021/ma00065a020

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 linear chain of polysaccharide chitosan has been derivatized by attaching different molecules to the 2-amino function of the backbone, namely lactose and ketoglutaric acid, therefore yielding branched comblike polymers. The dielectric behavior of aqueous solutions of these derivatives has been investigated in the frequency range from 1 MHz to 1 GHz, where pronounced dielectric dispersions occur. The deconvolution of both the permittivity and the dielectric loss spectrum into more than one dielectric mechanism shows that the high-frequency dielectric dispersion can be attributed to side-chain motions. The influence of pH and different species of counterions is investigated.

引用

页码：3363 / 3368

页数：6

共 26 条

[1] MEASUREMENTS OF COMPLEX DIELECTRIC-CONSTANT OF HUMAN-SERA AND ERYTHROCYTES [J].