Study On The Properties Of Epoxy Resin Composites Modified By Nanofiller

Nowadays,polymer-based nanocomposites have become a research hotspot in academic circles both at home and abroad,and it’s an important way to realize the high performance polymers.Researchers improve polymer performance by adding nanofillers(nanoclays,nano-boron nitride,graphene,etc.).In this paper,epoxy as the matrix,and three different nanofillers were synthesized by mussels-inspired biomimetic material-dopamine.Based on this,the influence of the interfacial forces on the tribology / mechanical properties of epoxy resin-based nanocomposites was investigated systematically.The main findings are as follows:PDA-epoxy nanocomposite has been prepared by dispersing PDA nanospheres.The epoxy/PDA nanocomposites were prepared by curing reaction of epoxy 44,Jeffamine D230 and various content of PDA(1 wt%,2 wt% and 4 wt%).The properties of nanocomposites with various PDA mass fraction were investigated by dynamic mechanical analysis(DMA),tribological and adhesion test.E of the nanocomposite with 4% PDA exhibited the maximum value of 2262 MPa,which increased by 88% in comparison with that of pure epoxy.Low PDA filler addition can remarkably improve the pull-off adhesion of the nanocomposites with steel and glass matrix.Addition of 1wt% PDA into the epoxy matrix brings about 586% and 41.5% increase compared with pure epoxy resin in pull-off adhesion to steel or glass,reaching 2.54 MPa and 2.66 MPa,respectively.Overall,the polydopamine nanocomposites exhibited outstanding performance.This work demonstrated that PDA nanospheres can obviously improve epoxy/PDA nanocomposites properties by compared to pure epoxy resin,indicating potential applications in coatings and composite materials.Dopamine was polymerized and decorated on surface of the hexagonal boron nitride(BN)to enhance the dispersibility and reactivity of BN.The structure and morphology of polydopamine-decorated BN nanosheets were identified by Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),scanning electron microscope(SEM)and transmission electron microscope(TEM),respectively.The thermal,mechanical and wear-resistant performance for nanocomposites with different BN loadings(0.5%,1%,2%,4%)were characterized via thermogravimetric analysis(TGA),dynamic mechanical analysis(DMA)and tribological tests.Results of thermal analysis showed that all BN-based composites possessed the superior thermal stability compared with the pure epoxy resin.The preferable mechanical and wear resistant performance of composites were attributed to the complementary role of mechanical,lubrication and thermal conductivity of BN nanosheets.A biomimetic dopamine chemistry was employed to enhance the dispersibility of nanographite in epoxy resin.The as prepared polydopamine coatied nanographite were characterized by Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),scanning electron microscope(SEM)and transmission electron microscopy(TEM),respectively.Epoxy/nanographite nanocomposites were prepared by curing reaction of epoxy E44,Jeffamine D-230 and polydopamine coated nanographite.Nanocomposites with different nanographite loadings(0.5%,1%,2%)were characterized by thermogravimetric analysis(TGA),dynamic mechanical analysis(DMA),tribological and thermal conductivity test.Results of thermal analysis showed that nanographite all enhanced the thermal stability in comparison with the pure epoxy resin.Compared to pure epoxy resin,the as-prepared nanocomposites exhibited improved thermal,mechanical and wear resistant performance,which was attributed to the complementary role of mechanical and thermal conductivity of nanographite.