Study On The Effect Of Catalyst On The Properties Of Aniline/Epoxy Resin And Composites

Epoxy resins are widely used in industrial fields as thermosetting resins.However,most thermosetting resins cannot be reused,which will cause waste of resources and environmental pollution.However,the traditional thermoplastic resin has high melt viscosity and is not easy to impregnate fibers,which limits its application in fiber-reinforced resin matrix composites.It is the current development direction of composite resin matrix to study new resins with both thermoplastic properties and excellent impregnation properties.The above two problems can be solved by in-situ polymerization of monoamine and epoxy resin.That is to say,the resin has low viscosity in the early stage of the reaction and can well infiltrate the fibers.Through the chain extension reaction,it can provide the physical and mechanical properties of the composite material.However,the molecular weight of the existing in-situ polymerization product is not high enough.Therefore,it is necessary to study how to improve the molecular weight.In order to improve the molecular weight and chain extension reaction efficiency of epoxy resin in-situ polymerization,and enhance its heat resistance,this paper selects bisphenol A epoxy resin（E-51）as the main body,triphenylphosphine（TPP）and stannous octoate as the catalyst,and aniline as the chain extension The reaction characteristics,solubility and physical and mechanical properties of the above in-situ polymerization system were studied;and thermoplastic glass fiber reinforced resin matrix composites were prepared,and their heat resistance,interfacial bonding properties and mechanical properties were tested and evaluated.The specific research contents are as follows:（1）In-situ polymerization system with TPP as catalyst,aniline as chain extender,and E-51 as the main resin.Thermoplastic epoxy resin products can be obtained by controlling the feeding ratio and reaction.The glass transition temperature（T_g）and weight average molecular weight（M_w）of EP-A₃-T₁were increased by 20.3%and205.4%,respectively,compared with the system EP-A₂ without TPP.In the initial stage of in-situ polymerization,the resin has excellent fiber infiltration ability,and the flexural strength of the prepared composite material is up to 773.5 MPa,which is about38.8%higher than EP-A₂.（2）In-situ polymerization system with stannous octoate as catalyst,aniline as chain extender,and E-51 as main resin.The reaction temperature of the in-situ polymerization system will be significantly reduced,and the product has thermoplastic properties.Compared with the resin system without stannous octoate,the T_g and M_wof the resin system with 0.5 phr of stannous octoate are increased by 22.9%and 117.3%,respectively.The flexural strength of EP-A-S_0.5 is 744.2 MPa,and the tensile strength is 1001.6 MPa,which are increased by 33.5%and 36.8%,respectively,compared with the system without catalyst.