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Characterization of soy‐based polyurethane networks prepared with different diisocyanates and their blends with petroleum‐based polyols
Author(s) -
Pechar Todd W.,
Wilkes Garth L.,
Zhou Bing,
Luo Ning
Publication year - 2007
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.26569
Subject(s) - polyol , polyurethane , hydroxyl value , glass transition , materials science , dynamic mechanical analysis , modulus , chemical engineering , polymer chemistry , composite material , polymer , engineering
Raw soybean oil was hydroxylated with acetic acid and hydrogen peroxide to prepare soy‐based polyols of various functionalities. These polyols were reacted with a modified diphenyl methane diisocyanate (Isonate 143L) to make polyurethane networks. The sol fractions decreased as the hydroxyl number of the polyol increased, and the glass‐transition temperatures increased with the hydroxyl number, as did the rubbery plateau storage modulus and Young's modulus of the networks. When the glass‐transition temperatures of each network were plotted as a function of the polyol's hydroxyl number, a linear relationship was observed over the range investigated. This trend closely matched that of our previous work with soy‐based polyurethane networks. A second series of networks was prepared with the same polyols but with different isocyanates. The nature of the crosslinker was shown to somewhat influence the sol fractions, glass‐transition temperatures, and stress–strain behavior of the networks. A linear relationship was recorded between the storage modulus at 125°C of a network and the average functionality of the polyol from which it was synthesized. Finally, two separate polyurethane networks were prepared through the blending of two polyols: one based on petroleum and the other based on soy. These networks were also characterized, and the compatibility of each blend was addressed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007