Toughening Anhydride-Cured Epoxy Resins Using Fatty Alkyl-Anhydride-Grafted Epoxidized Soybean Oil

ACS Omega
Santosh K YadavGiuseppe R Palmese

Abstract

The aim of this work is to develop a series of advanced biobased tougheners for thermosetting epoxy resins suitable for high-performance applications. These bio-rubber (BR) tougheners were prepared via a one-step chemical modification of epoxidized soybean oil using biobased hexanoic anhydride. To investigate their toughening performance, these BR tougheners were blended with diglycidyl ether of bisphenol A epoxy monomers at various weight fractions and cured with anhydride hardeners. Significant improvements in fracture toughness properties, as well as minimal reductions in glass transition temperature (Tg), were observed. When 20 wt % of a BR toughener was utilized, the critical stress intensity factor and critical strain energy release rate of a thermosetting matrix were enhanced by >200 and >500%, respectively, whereas the Tg was reduced by only 20 °C. The phase-separated domains were evenly dispersed across the fracture surfaces as observed through scanning electron microscopy and atomic force microscopy. Moreover, domain sizes were demonstrated to be tunable within the micrometer range by altering the toughener molecular structure and weight fractions. These BR tougheners demonstrate the possibility of achieving toughness...Continue Reading

References

Nov 24, 2005·Journal of Agricultural and Food Chemistry·Atanu BiswasJulious L Willett
Apr 11, 2008·Journal of Agricultural and Food Chemistry·Brajendra K SharmaSevim Z Erhan
Jun 19, 2008·Journal of Agricultural and Food Chemistry·Atanu BiswasH N Cheng
Sep 12, 2008·Journal of Agricultural and Food Chemistry·Sevim Z ErhanAtanu Adhvaryu
Mar 8, 2011·Journal of Agricultural and Food Chemistry·Atanu BiswasH N Cheng
Oct 16, 2013·Chemical Reviews·Rémi AuvergneJean-Pierre Pascault
Mar 26, 2014·ACS Applied Materials & Interfaces·Wanshuang LiuXuehong Lu

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Methods Mentioned

BETA
scanning
atomic force microscopy
rheometry
infrared spectroscopy
AFM
acylation

Software Mentioned

ImageJ

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