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Morphology and mechanical properties of pullulan/poly(vinyl alcohol) blends crosslinked with glyoxal
Author(s) -
Teramoto Naozumi,
Saitoh Masahiko,
Kuroiwa Johta,
Shibata Mitsuhiro,
Yosomiya Ryutoku
Publication year - 2001
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.2075
Subject(s) - pullulan , vinyl alcohol , materials science , glyoxal , glass transition , ultimate tensile strength , polymer chemistry , composite material , morphology (biology) , casting , dynamic mechanical analysis , polymer blend , polymer , chemical engineering , chemistry , organic chemistry , polysaccharide , copolymer , biology , engineering , genetics
We prepared pullulan/poly(vinyl alcohol) (PVA) blend films by casting the polymer solution in dimethyl sulfoxide. Their morphology and mechanical properties were investigated. Scanning electron micrographs revealed that the pullulan was immiscible with PVA over the entire composition range. The tensile strength and modulus of the blend films were lower than those predicted by the upper bound composite equation. To improve the mechanical properties, we investigated the reaction of the 40/60 blend with glyoxal. The infrared spectral change and the increase in the glass‐transition temperature (corresponding to the PVA component) accompanying the reaction indicated that crosslinking with glyoxal had proceeded. The crosslinked films were homogeneous and had higher tensile strengths and moduli than the simple blend. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2273–2280, 2001