Effect of substituents on dielectric beta-relaxation in cellulose

被引:0
|
作者
Saad, GR [1 ]
Furuhata, K [1 ]
机构
[1] TOKYO INST TECHNOL,FAC ENGN,DEPT ORGAN & POLYMER MAT,MEGURO KU,TOKYO 152,JAPAN
关键词
dielectric behaviour; beta-relaxation; regenerated cellulose; chlorodeoxycellulose; bromodeoxycellulose; thiocyanatodeoxycellulose;
D O I
10.1002/(SICI)1097-0126(199704)42:4<356::AID-PI709>3.0.CO;2-E
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 dielectric characteristics for some cellulose derivatives, namely chlorodeoxycellulose (Cell-Cl; degree of substitution of chlorine, DSCl = 0.87), bromodeoxycellulose (Cell-Br; DSBr = 0.92) and thiocyanatodeoxycellulose (Cell-SCN; DSSCN = 0.88), all substituted only at C-6, together with those of regenerated cellulose, have been investigated in the temperature range - 60 to 120 degrees C, and in the frequency range 0.2-100 kHz. Only one relaxation process, designated as beta, was identified within the frequency and temperature ranges studied. The activation energy of this relaxation increases in the order Cell-Cl < Cell-Br < Cell-SCN, suggesting that the bulkiness of the substituent was the determining factor of the activation energy. The characteristic dielectric parameters, namely polarization magnitude (Delta epsilon) and shape parameter (alpha or <(beta) over bar>), were obtained by the analysis of absorption bands and are discussed in relation to the substituent effect.
引用
收藏
页码:356 / 362
页数:7
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