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Effect of Substituents on Dielectric β‐Relaxation in Cellulose
Author(s) -
Saad Gamal R.,
Furuhata Kenichi
Publication year - 1997
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199704)42:4<356::aid-pi709>3.0.co;2-e
Subject(s) - substituent , activation energy , dielectric , cellulose , relaxation (psychology) , chemistry , polymer chemistry , materials science , analytical chemistry (journal) , organic chemistry , psychology , social psychology , optoelectronics
The dielectric characteristics for some cellulose derivatives, namely chlorodeoxycellulose (Cell‐Cl; degree of substitution of chlorine, DS Cl =0·87), bromodeoxycellulose (Cell‐Br; DS Br =0·92) and thiocyanatodeoxycellulose (Cell‐SCN; DS SCN =0·88), all substituted only at C‐6, together with those of regenerated cellulose, have been investigated in the temperature range ‐60 to 120°C, and in the frequency range 0·2–100kHz. Only one relaxation process, designated as β, was identified within the frequency and temperature ranges studied. The activation energy of this relaxation increases in the order Cell‐Cl