Premium
Characterization of biodegradable polymers by inverse gas chromatography. III. Blends of amylopectin and poly( L ‐lactide)
Author(s) -
Zhong Bihuan,
AlSaigh Zeki Y.
Publication year - 2011
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.34516
Subject(s) - inverse gas chromatography , crystallinity , miscibility , materials science , amylopectin , lactide , polymer chemistry , polymer , polymer blend , surface energy , chemical engineering , polymerization , copolymer , chemistry , composite material , organic chemistry , starch , amylose , engineering
The morphology changes and surface thermodynamics of blends of amylopectin (AP)–poly( L ‐lactide) (PLA) were investigated over a wide range of temperatures and compositions using the inverse gas chromatography method. Twenty‐five solutes were selected such as alkanes, acetates, oxy, halogenated, and six‐member ring families. They provided a variety of specific interactions with the blends' surface. The morphology showed two regions, some others showed a de‐polymerization above 130°C. These zones enabled the estimation of T g and T m of AP, PLA, and the blends. Blending AP with PLA caused a decrease in AP's T g value due to the reduction of the degree of crystallinity of the blend. Exothermic values of χ 23 were obtained indicating the compatibility of AP and PLA at all temperatures and weight fractions of AP–PLA. The miscibility was favored at 75%AP, only 25%AP–75%PLA composition influenced the degree of crystallinity. The dispersive component of the surface energy of the blends ranged from 16.09 mJ/m 2 for the pure AP as high as 58.36 mJ/m 2 at 110°C when AP was mixed with PLA in a 50–50% ratio. The surface energy was at its highest value when the composition was 75% of AP, in good agreement with χ 23 values. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012