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Control of structure and mechanical properties for binary blends of poly(3‐hydroxybutyrate) and cellulose derivative
Author(s) -
Yamaguchi Masayuki,
Arakawa Keiichi
Publication year - 2006
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.25455
Subject(s) - materials science , cellulose , glass transition , crystallization , miscibility , propionate , dynamic mechanical analysis , polymer chemistry , derivative (finance) , polymer , ultimate tensile strength , cellulose acetate , composite material , polymer blend , chemical engineering , organic chemistry , chemistry , copolymer , financial economics , engineering , economics
Structure and mechanical properties for binary blends composed of a poly(3‐hydroxybutyrate) (PHB) and a cellulose derivative, such as cellulose acetate propionate (CAP) and cellulose acetate butyrate (CAB), have been studied by means of dynamic mechanical analysis, isothermal crystallization measurements, and tensile testing. It is found that β relaxation temperature due to glass transition of PHB or PHB‐rich phase in the blends, in which the cellulose derivative has lower molecular weight, is almost the same as that of the pure PHB. On the other hand, the peak location is shifted to even lower temperature than that of the pure PHB by blending the cellulose derivative with higher molecular weight, although the cellulose derivative is a glassy polymer with high glass transition temperature. Further, the blend with lower β relaxation temperature exhibits ductile behavior with low modulus in uniaxial deformation. The difference in the structure and mechanical properties for the blends are found to be determined by the crystallization rate. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3447–3452, 2007