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Off-stoichiometry Effect on Network Structure and Tensile Properties of an Epoxy Resin
Kosuke Mitsuki,Atsuomi Shundo,Satoru Yamamoto,Keiji Tanaka 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Epoxy resins, which have a network structure formed via curing reactions of epoxy and amine compounds, are often used as a composite with inorganic fillers. In general, either an epoxy or amine component was segregated at the filler interface, meaning that the reaction at the interface would proceed non- stoichiometrically. The objective of this study is to give a better understanding of how off-stoichiometry affects the network, thereby the material properties. The epoxy resins were obtained by the reaction of di-functional epoxy and amine compounds at various ratios (p). Higher p value corresponds to an excess of epoxy groups compared to amino ones. The glass transition temperature decreased with increasing p, suggesting a plasticizing effect of unreacted epoxies. Young’s modulus remained unchanged at a lower p, while it started to decrease at a higher p. Discussion on the correlation with the network will be given.