Preparation Of E-51 Shape Memory Epoxy Resin And Electron Irradiation Effects

Shape memory epoxy resin can change its shape and recover to the original shape under certain conditions. Shape memory epoxy resin has the advantages of greater mechanical properties, lower price and its high reliability, so it has great potential application in deployable mechanism of aircrafts.In general, the shape of epoxy resin should have a high degree of curing, but the degree of crosslinking should be low. According to this theory, in this paper, the raw materials of the shape memory polymer include epoxy resin E-51, curing agent DDM(4’4-Methylene dianiline), flexibilizer PPGDGE(Gather propylene glycol two glycidyl ether). KH-570 silane coupling agent was coated on PVA film surface before casting by using polyvinyl alcohol(PVA) film as substrate, and the shape memory epoxy film that the thickness was 100μm was prepared.These films were irradiated by the electrons of different energy and fluence. The shape memory performance of the irradiated material was tested by using self-made shape memory testing device. Tg(glass transition temperature) was tested by DSC(Differential Scanning Calorimetry), DMA(Dynamic Mechanical Analysis). FT-IR and AFM(atomic force microscopy) was used to detect the change of the internal structure and the roughness of the surface of self-made shape memory epoxy resin.The results show that, when shape memory epoxy resin was irradiated under the electrons that the fluence is less than 1E15cm-2 of low energy, the shape memory properties remains good. When the energy of irradiation electrons is 100 ke V and the fluence is 1E15cm-2, the Tg(glass transition temperature) of self-made shape memory epoxy resin raised by about 5℃, the shape fixed ratio and shape recovery ratio improved and the shape recovery time changes shorter. The material irradiated under electrons that the energy of 170 ke V can undergo more than 7 times the shape memory cycle and the recovery property has not changed. Under the irradiation of the electrons that the energy is low, the storage modulus of shape memory epoxy r e s i n o c c u r r e d t h r e e o r d e r s o f m a g n i t u d e c h a n g e s a f t e r T g. W h e n the shape memory epoxy resin is irradiated by the electrons that the energy is 1Me V, the glass Tg(transition-temperature)alternatingly changes when the fluence increases. And when the electron irradiation energy is 1Me V and the fluence is 1E15cm-2, the Tg(glass transition temperature) of self-made shape memory epoxy resin is the lowest, only 40.25℃.