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Moisture‐resistant and strength retention properties of supercritical CO 2 ‐processed thermoplastic starch modified by polyvinyl alcohol with varying degrees of polymerization
Author(s) -
Sun LiangShuang,
Wang Dawei,
Peng Xuanlong,
Runt James,
Huang Chaoming,
Huang KuoShien,
Yeh Jentaut
Publication year - 2019
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4515
Subject(s) - materials science , polyvinyl alcohol , ultimate tensile strength , composite material , thermoplastic , supercritical fluid , starch , organic chemistry , chemistry
The ease of melt‐processing, moisture‐resistance, and tensile retention properties of scCO 2 and polyvinyl alcohol (PVA)–modified thermoplastic starch (scCO 2 TPS x PVA a y ) materials were explored in this investigation. These characteristics were considerably improved by PVA modification particularly with decreasing PVA degree of polymerization (DP). The intensities of O―H stretching bands of scCO 2 TPS x PVA a y were considerably larger, and peak location of O―H stretching bands were significantly smaller than those of the corresponding TPS x PVA a y and reduced gradually with the decrease in PVA's DP. The ΔH of melting and diffraction peaks of V h ‐type crystals for conditioned TPS x PVA a y and scCO 2 TPS x PVA a y were considerably smaller than those of corresponding TPS and TPS x PVA a y aged for the same time period and gradually reduced in intensity with decreasing PVA's DP. Possible reasons accounting for the considerably improved melt processing, moisture resistance, tensile retention, and retrogradation of scCO 2 TPS x PVA a y with decreasing PVA's DP are proposed.