Epoxy thermosets modified with novel nano-scaled, self-assembled block copolymers: Toughening mechanisms and extension to composites

Nikhil E. Verahese, George Jacob, Marv Dettloff, Ha Q. Pham, Jia Liu, Hung Jue Sue, Zachary J. Thompson, Frank S. Bates, John F. Mandelf, Daniel Samborsky

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A unique approach to toughening thermosets has been identified by introducing small amounts of amphiphilic block copolymer. The result is a good viscosity-Tg-toughness balance. In this paper, the fracture behavior of these modified epoxies, was carefully studied in an attempt to understand the toughening mechanisms that exist. The findings suggest that cavitation in even these nano-sized spherical micelles is the primary mechanism of toughening. These findings were also found to be a strong function of the crosslink density of the host network with higher levels of plastic deformation at the crack tip being observed in the low crosslink density systems. Glass fiber reinforced composites made with epoxies modified with these toughening agents were found to have improved fatigue resistance.

Original languageEnglish (US)
Title of host publication9th Annual Automotive Composites Conference and Exhibition, ACCE 2009
Pages513-521
Number of pages9
StatePublished - Dec 1 2009
Event9th Annual Automotive Composites Conference and Exhibition, ACCE 2009 - Troy, MI, United States
Duration: Sep 15 2009Sep 16 2009

Publication series

Name9th Annual Automotive Composites Conference and Exhibition, ACCE 2009

Other

Other9th Annual Automotive Composites Conference and Exhibition, ACCE 2009
CountryUnited States
CityTroy, MI
Period9/15/099/16/09

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