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Thermal depolarization currents of regenerated cellulose films
Author(s) -
Baum Gary A.
Publication year - 1973
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1973.070170922
Subject(s) - depolarization , cellulose , plasticizer , materials science , thermal , current (fluid) , composite material , regenerated cellulose , chemical engineering , polymer chemistry , analytical chemistry (journal) , chemistry , organic chemistry , physics , thermodynamics , medicine , engineering , endocrinology
The thermal depolarization current technique is applied to plasticized and unplasticized regenerated cellulose films. In unplasticized cellulose, two depolarization current bands are observed. The band with a current maximum occurring near 298°K ( T m ), and with an activation energy, U , of 0.57 eV, is believed to be related to the second‐order transition which is known to occur in dry cellulose in the vicinity of 298°K. The second band, with T m = 215°K and U = 0.26 eV, is also present in the plasticized material, and possibly arises from primary hydroxyl group orientations. In cellulose films plasticized with glycerol, an intense band occurs at 271°K, with U = 0.51 eV, and is attributed to the plasticizer. A third band, occurring in the plasticized material near 300°K, has not been fully investigated.