Abstract
Sorbitol polyglycidyl ether (SPE) was cured with citric acid (CA), tartaric acid (TA), maleic acid (MA) and itaconic acid (IA) as biobased di- and tricarboxylic acids in the presence or absence of microfibrillated cellulose (MFC) to produce biobased epoxy nanocomposites or cured epoxy resins, respectively. For the curing systems of SPE/IA, the crosslinking of unsaturated C = C bonds in the IA units were investigated by the addition of potassium persulfate (KPS) as an aqueous radical initiator. The FT-IR spectral analysis revealed that the curing reaction of epoxy and carboxy groups smoothly proceeded for all the cured resins and nanocomposites, and unsaturated C = C bonds of IA were crosslinked by use of KPS. The addition of KPS in the SPE/IA curing system was effective to improve the glass transition temperature (Tg) and tensile properties. SPE-IA-KPS exhibited the highest Tg, tensile strength and tensile modulus (62.8 °C, 15.4 MPa and 1.08 GPa) among all the cured resins. The tensile properties of all the cured resins were effectively improved by the addition of MFC. Although the tan δ peak temperatures (59–62 °C) of SPE-IA-KPS and SPE-IA-KPS/MFC nanocomposites were almost no changes, the storage moduli at the temperature range of 60–100 °C increased with increasing MFC content.
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We thank Dr. Naozumi Teramoto of our department for his helpful suggestions.
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Sugane, K., Mishima, T. & Shibata, M. Biobased epoxy nanocomposites composed of sorbitol polyglycidyl ether, biobased carboxylic acids and microfibrillated cellulose. J Polym Res 28, 257 (2021). https://doi.org/10.1007/s10965-021-02595-x
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DOI: https://doi.org/10.1007/s10965-021-02595-x