Study on terminal amino polyether toughened modified bisphenol A type epoxy resin

doi:10.19936/j.cnki.2096-8000.20230828.004

Abstract

Abstract: Aiming at the process problem of poor toughness and easy cracking of bisphenol A epoxy resin after crosslinking and curing, the terminal amino polyether is used to toughen and modify the epoxy resin. The curing process of resin glue before and after toughening was studied by viscometer and differential scanning calorimeter and the curing system was determined. The curing kinetic equation of the toughened epoxy resin was derived by curing kinetic analysis. The effects of flexibilizer on T_g value and thermal decomposition performance of resin casting body were studied by DSC method, DMA method and TG method. The mechanical properties of resin casts and composites before and after toughening were tested, and the cross-sectional morphology of castings and composites was analyzed by SEM and the fracture mechanism was speculated. The results showed that when 15 parts of toughening agent were added, the tensile strength of the cast reached a maximum of 69.8 MPa, which was 54.1% higher than before toughening. The impact toughness of the cast has increased by 42.4% compared with before toughening. At this time, the mechanical properties of the composite materials have increased significantly compared with before toughening, and the purpose of toughening and strengthening has been achieved.

Key words: epoxy resin, toughening enhancement, “Island Structure”, casting body, composites

CLC Number:

TB332

ZHANG Weijun, WANG Dan, YANG Kaikai, CHEN Feng. Study on terminal amino polyether toughened modified bisphenol A type epoxy resin[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(8): 26-33.

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