Toughening of Epoxy Resins Using Anhydride Modified Epoxidized Soybean Oil
The aim of this work is to develop of advanced biobased tougheners for thermosetting epoxy resins suitable for high-performance applications. These tougheners (bio rubbers BRs) were prepared via one-step chemical modification of epoxidized soybean oil (ESO) using biobased anhydride. To investigate their toughening performance, these BR tougheners with variable weight fractions were utilized to formulate with a bisphenol diglycidyl ether (DGEBA, commercially named EPON828) and cured with anhydride hardeners. Significant improvements of fracture toughness properties and highly retained of glass transition temperature (Tg), were observed. Scanning electron microscopy (SEM) was used to study the fracture surface morphology, it was observed that phase separation domains evenly dispersed across the fractures. Moreover, phase separation domain sizes were demonstrated to be well tunable in micrometer range by altering toughener weight fractions. These BR tougheners display the possibility of fully combining the extraordinary performance of BRs with the properties of epoxy thermosetting resins.
Author: Santosh Kumar Yadav
Conference: SAMPE Seattle 2017