Epoxidized soybean oil oligomer toughened epoxy adhesives

Epoxidized soybean oil(ESO) has been used to toughen epoxy resin cured at room and high temperature. The ESO was prepolymerized by three methods to obtain the liquid epoxidized soybean rubber (ESR). The ESR modified epoxy networks were evaluated for their adhesion and mechanical properties. Testing resulte show that,the ESR has much affection on adhesion and mechanical properties of cured epoxy resins and less effect on initial viscosity of modified epoxy resins. In comparison with unmodified epoxy resin,the shear strength of modified epoxy resin by the ESR synthesized with cis -butenedioic anhydride has increased by 56.64%.