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“Antiplasticization” in starch‐glycerol films?
Author(s) -
Lourdin D.,
Bizot H.,
Colonna P.
Publication year - 1997
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/(sici)1097-4628(19970222)63:8<1047::aid-app11>3.0.co;2-3
Subject(s) - plasticizer , glycerol , materials science , starch , polymer , elongation , relaxation (psychology) , polymer chemistry , dynamic mechanical analysis , composite material , chemical engineering , chemistry , organic chemistry , ultimate tensile strength , psychology , social psychology , engineering
Calorimetric, mechanical, and thermomechanical properties have been measured on starch films with various glycerol/water contents. For calorimetric measurements, a continuous decrease in T g was observed as glycerol increases from 0 to 25%. Mechanical properties exhibit a minimum of elongation at break for glycerol content ∼ 12%. In slightly hydrated starch films not containing another plasticizer, a β relaxation is detected by DMTA around −68°C. This relaxation is modified by the presence of glycerol, the α relaxation of which appears in the same temperature range. Results are discussed comparing with the well‐known antiplasticization effect in synthetic polymers such as PVC and PC. The combination of the plasticizer α mode and the polymer β mode is considered. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 1047–1053, 1997