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Effects of calcium carbonate as the expanding inhibitor on the structural and mechanical properties of expanded starch/polyvinyl alcohol blends
Author(s) -
Yang JuneHo,
Park Jongshin,
Kim Daehyun,
Lee Daehoon
Publication year - 2004
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.20625
Subject(s) - ultimate tensile strength , starch , materials science , elongation , polyvinyl alcohol , calcium carbonate , composite material , plastics extrusion , fourier transform infrared spectroscopy , chemical engineering , chemistry , organic chemistry , engineering
In this study, expanded starch/PVA/CaCO 3 blends (ESPCs) were prepared using the pilot system composed of a supermixer and a twin‐screw extruder to investigate the effects of CaCO 3 as the expanding inhibitor on the structural and mechanical properties of ESPCs. The pore ratio of ESPCs with the interconnecting open‐cell structure decreased with increasing CaCO 3 content and the structure of ESPCs became more compact. The inhibiting process of CaCO 3 during the expansion of starch/PVA blends was proposed and certified by FTIR spectroscopy and X‐ray diffraction. At least two parts of CaCO 3 were required to obtain a sufficient inhibiting effect on the expansion. The mechanical properties of ESPCs such as tensile strength, elongation at break, modulus, and specific work of rupture were improved by the addition of CaCO 3 as the expanding inhibitor. As CaCO 3 content increased from one to four parts, the tensile strength increased 2.6‐fold, from 70 to 180 kPa, whereas elongation at break increased about 1.5‐fold. The moduli of ESPCs also increased with increasing CaCO 3 content. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1762–1768, 2004