Highly ductile glassy epoxy systems obtained by network topology modification using partially reacted substructures
نویسندگان
چکیده
A strategy for toughening epoxy thermosets via topological rearrangement of cross-linked networks is presented. Amine-cured systems were modified by mixing partially reacted substructures (mPRS), which synthesized curing tetraglycidyl ether diaminodiphenylmethane (TGDDM) and polyether monoamine (Jeffamine M1000) to provide free unbound surfaces that enhance protovoid formation during deformation. The influence mPRS conversion weight ratio on the properties diglycidyl bisphenol (DGEBA) TGDDM cured with Jeffamine D230 was investigated. Adding resulted in high Tg capable exceptional strain at failure tension: 43% DGEBA (Tg = 75 °C) 20% 135 °C). addition mPRS, however, decreases relative unmodified systems. SEM SAXS characterization evidence (18–34 nm) formation. Quasi-static compressive tests conducted testing temperatures selected maintain a constant - Ttest) reveal opening mechanism plays dominant role enhanced ductility.
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ژورنال
عنوان ژورنال: Polymer
سال: 2021
ISSN: ['1873-2291', '0032-3861']
DOI: https://doi.org/10.1016/j.polymer.2020.123260