Premium
Characterization of polyurethane foam prepared by using starch as polyol
Author(s) -
Kwon OhJin,
Yang SeongRyul,
Kim DaeHyun,
Park JongShin
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.25363
Subject(s) - polyurethane , polyol , hexamethylene diisocyanate , isocyanate , materials science , polypropylene glycol , polymer chemistry , toluene diisocyanate , prepolymer , polyethylene glycol , fourier transform infrared spectroscopy , chemical engineering , composite material , chemistry , organic chemistry , engineering
Polyurethane foams were prepared using starch as a main component of polyols and their structural, mechanical, and absorbing properties for organic solvents were investigated. Fourier transform infrared spectra showed that urethane linkage was formed by the reactions between NCO of diisocyanates and OH of polyols. When polyurethane foams were prepared at high molar ratio of NCO/OH, the unreacted NCO groups were detected. Also, urea linkage was formed by the reaction between diisocyanate and water, which was used as the foaming agent. The micrographs showed that the polyurethane foams had closed‐cell structure, of which the cell size increased with NCO/OH molar ratio. The density of polyurethane foams increased with molecular weight of polyethylene glycol. The compressive moduli of polyurethane foams increased with NCO/OH molar ratio. Polyurethane foams prepared using toluene‐2,4‐diisocyanate as diisocyanate had the highest modulus, while those prepared using hexamethylene diisocyanate had the lowest modulus. In case of the absorbency for the organic solvents, the polyurethane foams prepared at NCO/OH molar ratio of 0.8 had the maximum absorbency. Among several organic solvents, the absorbency for dimethyl sulfoxide was the highest, while the absorbency for tetrahydrofuran was the lowest. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1544–1553, 2007