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Preparation and properties of biocomposites composed of sorbitol‐based epoxy resin, tung oil‐pyrogallol resin, and wood flour
Author(s) -
Shibata Mitsuhiro,
Teramoto Naozumi,
Yoshihara Satoru,
Itakura Yusuke
Publication year - 2012
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.38739
Subject(s) - epoxy , materials science , ultimate tensile strength , pyrogallol , curing (chemistry) , composite material , wood flour , nuclear chemistry , polymer chemistry , chemistry , organic chemistry
The biocomposites composed of sorbitol polyglycidyl ether (SPE), tung oil‐pyrogallol resin (TPG), and wood flour (WF) were prepared by the compression molding at 190°C, and their thermal and mechanical properties were investigated in detail. The epoxy/hydroxy ratio was fixed to 1/1 in the curing reaction of SPE and TPG, based on the fact that the degree of addition of pyrogallol to each tung oil molecule for the TPG used as a flexible bio‐based hardener is evaluated to be 2.3 by 1 H‐NMR method. The SPE‐TPG/WF biocomposites showed much higher storage moduli than SPE‐TPG did, although tan δ peak temperatures of the biocomposites (44.5–45.6°C) were a little lower than that of SPE‐TPG (53.5°C). Tensile moduli of the biocomposites increased with an increase of WF content in the range of 0–50 wt %. Furthermore, the biocomposites had a little higher tensile strength than the cured neat resin did. Field emission‐scanning electron microscopy analysis of the biocomposites revealed that WF is tightly incorporated into the crosslinked epoxy resins. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013