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        Enhanced Toughness and Mechanical Property of Epoxy Resins with Good Shape Memory Behaviors

        Longhao Tang,Yanling Wang,Tuo Zhou,Yongfei Li,Qiang Li 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6

        Developing shape memory polymers (SMPs) with enough mechanical strength, good toughness and excellentprocessability(mild synthesis conditions) is still a challenge for researchers. Therefore, a series of rigid-flexible epoxy SMPswere prepared based on epoxy resin, trimethylolpropane tris(3-mercaptopropionate) (TMP), and N,N-diglycidyl-4-glycidyloxyaniline (TGE) through thiol-epoxy click-reaction. The effect of sulfide curing agent and modifier on the crosslinknetworks and main features (mechanical strength, toughness, and shape memory performance) of epoxy samples wereinvestigated. Experimental results displayed temperature-dependent modulus and strength with two order of magnitudedifference between room temperature and glass transition temperature (Tg). TGE showed great effect on the improvement ofmechanical properties of the epoxy material, increasing from 724.2 MPa to 1637 MPa, nearly 220 %. Moreover, shapememorytest revealed that prepared epoxy SMPs are capable to fulfil the recovery process within 2 mins as long astemperature elevated to or above Tg, with shape fixity ratio over 99 % and shape recovery ratio above 90 %.

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