Preparation of adipic acid-based epoxy resin and toughening for epoxy resin
A novel epoxy resin,adipic acid base epoxy resin(AAEP)was synthesized and used to toughen bisphenol A type epoxy resin(E-51).The molecular structure of AAEP was characterized by infrared spectroscopy(FTIR)and hydrogen nuclear magnetic resonance spectroscopy(1H-NMR).The results showed that the synthesis of AAEP was consistent with the molecular design.The epoxy value was 0.425 mol/100 g and the viscosity was 320 mPa·s.The synthesized AAEP was used as toughening agent and cocured with epoxy resin E51.The mechanical properties of cured AAEP/E-51 were tested and the fracture surface was characterized.The effect of AAEP addition amont on the mechanical properties of AAEP/E-51 was investigated.The results showed that when the mass ratio of AAEP to E-51 was 10:100,the mechanical properties of AAEP/E-51 were the best.Compared with pure E-51,the tensile strength,elongation at break,impact strength and flexural strength were increased by 30.4％,50.9％,68.2％and 38.0％,respectively,and the ductile fracture was obvious.
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