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Highly ductile glassy epoxy systems obtained by network topology modification using partially reacted substructures
Journal article   Open access   Peer reviewed

Highly ductile glassy epoxy systems obtained by network topology modification using partially reacted substructures

J. Gao, X. Chu, C. K. Henry, S. C. Santos and G. R. Palmese
Polymer (Guilford), v 212, p123260
06 Jan 2021
DOI: https://doi.org/10.1016/j.polymer.2020.123260
url
https://doi.org/10.1016/j.polymer.2020.123260View
Accepted (AM)Maybe Open Access (Publisher Bronze),  Open

Abstract

Physical Sciences Polymer Science Science & Technology
A strategy for toughening epoxy thermosets via topological rearrangement of cross-linked networks is presented. Amine-cured epoxy systems were modified by mixing partially reacted substructures (mPRS), which were synthesized by partially curing tetraglycidyl ether of diaminodiphenylmethane (TGDDM) and polyether monoamine (Jeffamine M1000) to provide free unbound surfaces that enhance protovoid formation during deformation. The influence of mPRS conversion and weight ratio on the properties of diglycidyl ether of bisphenol A (DGEBA) and TGDDM systems cured with Jeffamine D230 was investigated. Adding mPRS resulted in high T-g systems capable of exceptional strain at failure in tension: 43% for the DGEBA (T-g = 75 degrees C) and 20% for the TGDDM (T-g = 135 degrees C). The addition of mPRS, however, decreases T-g relative to unmodified systems. SEM and SAXS characterization provide evidence of protovoid (18-34 nm) formation. Quasi-static compressive tests conducted at testing temperatures selected to maintain a constant (T-g - T-test) reveal the protovoid opening mechanism plays a dominant role in enhanced ductility.

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