Preparation And Characterization Of High Performance Epoxy Resin Composites

In order to improve the performance of epoxy resin in advanced field,ternary epoxy resin composites with excellent performance were prepared by introducing cage-type polysilsesquioxane(POSS),nano-zinc oxide,graphene oxide,and its mechanical properties,UV radiation resistance and thermal conductivity were tested and characterized.In this paper,three kinds of POSS-epoxy resin composites with different functional groups were prepared,and the mechanism and influencing factors of POSS toughening epoxy resin were compared.The results show that Methacryl-POSS has the most obvious effect,which can be due to Methacryl-POSS/EP has better dispersibility in the epoxy resin toughening matrix,and the group has a longer molecular chain can have a higher cross-linking strength with the matrix.Scanning electron microscope(SEM)analysis agrees well with the mechanical test results.Meanwhile,adding nanoparticles has no obvious impact on the excellent thermal stability of EP.Based on the above research,in order to improve the anti-ultraviolet performance of epoxy resin in outdoor applications,Vinyl-POSS-ZnO/EP composites were prepared by solution blending.The results show that the bending strength value of pure epoxy resin system is reduced by 20.7%,and the impact strength value is reduced by 20.3%after ultraviolet radiation treatment.However,the composites with Vinyl-POSS(1.0phr)and ZnO(2.0phr)had only a 9.6%reduction in flexural strength and only a 9.9%reduction in impact strength.This shows that the introduction of ZnO and Vinyl-POSS significantly improves the UV radiation resistance and mechanical properties of epoxy resins.SEM analysis of the composites also confirmed this conclusion.POSS-GO was prepared by 1,6-Hexanediamine(HDM)as a bridge and high thermal conductivity toughening composites were prepared by introducing POSS-GO into epoxy resin with solution blending.The introduction of HDM-POSS molecular chain can not only improve the dispersion of GO in epoxy,but also as "stent" prevent the accumulation of GO.Results show that when the weight loading of GO and POSS-GO was 1.0phr,the thermal conductivity of composites improved by 26.32%and 63.16%as compared to neat epoxy.Impact strength of POSS-GO/EP is 29.29%higher than that of GO/EP at 0.8phr and bending strength tests also showed similar results.Compared with pristine GO,POSS-GO possessed better thermal conductivity and toughening effect for epoxy,moreover,the mechanism is discussed in this paper.