Copolymers Based on Epoxidized Soy Bean Oil and Diglycidyl Ether of Bisphenol A: Relation Between Morphology and Fracture Behavior

F. I. ALTUNA; V. PETTARIN; L. MARTIN; A. RETEGI; I. MONDRAGON; R.A. RUSECKAITE; P.M. STEFANI

POLYMER ENGINEERING AND SCIENCE

JOHN WILEY & SONS INC

Lugar: New York; Año: 2014 vol. 54 p. 569 - 578

0032-3888

Epoxidized soybean oil (ESO) was proved to be a good alternative to partially replace a synthetic commercial epoxy resin in a formulation to obtain thermosetting polymer, contributing to transform a vegetable oil into a higher added value product. This work focuses on the study of the fracture behavior of copolymers based on anhydride-cured epoxy systems with different contentsof ESO as a replacement for the synthetic resin. It was found that fracture toughness was greatly improved when replacing diglycidyl ether of bisphenol A (DGEBA) by ESO, being the critical stress intensity factor (KIC) 1.067 MPam1/2 for cured ESO and 0.557 MPam1/2 for cured DGEBA. The better performance of ESO networks was ascribed to its higher ability toattain plastic deformation. Moreover, for DGEBA-ESO systems, the morphologies generated during the curing process were also considered to account for the observed results.