Graphene Oxide Modified PVB Composite Films

Due to many excellent properties,polyvinyl butyral(PVB)is widely used in the fields of automobile,construction and aerospace,especially in the interlayer film of automotive laminated glass,which accounts for more than 90% in the market applications.With the rapid development of the national economy,the domestic automobile industry is booming and has become a heavy industry supporting the development of the national economy,which has prompted the expansion of polyvinyl butyral production and its industry structure has ushered in major changes.The demand for self-developed polyvinyl butyral is increasing,and it is particularly important to develop the new modified polyvinyl butyral.In addition,the preparation of polymer-based nanocomposites is an important way to modify polymers,which can obtain properties that are not possessed by a pristine material,thereby obtaining desirable comprehensive properties.Graphene oxide(GO)has become a popular material for modified polymers due to its excellent physicochemical properties.This work is to obtain high-performance and low-cost modified polyvinyl butyral,aiming to develop a polyvinyl butyral-based nanocomposite film with high strength and good light transmittance.Different functional graphene oxides(m GO)were used to modify PVB,and the effects of m GO filling amount and modification process on the properties of m GO/PVB composite films were studied.The main conclusions are as follows:GO was prepared by a modified Hummers method and functionalized by using hexadecyl trimethyl ammonium bromide or sodium dodecyl or sulfate sodium dodecyl benzene sulfonate.The successful preparation of m GO was proved by FTIR,Raman,TEM and other characterizations.The PVB-m GO composite film was prepared by solution blending method.In order to meet the industrial demand,g PVB-m GO composite film was prepared by adding 30 wt% triglycol dioctate(3GEH).It is found that the introduction of m GO can significantly improve the ultraviolet shielding ability and mechanical properties of PVB.Comparing the three functionalized graphene oxides,when the s GO content is 0.03 wt%,the comprehensive properties of the composite film are the best,in which the tensile strength reaches 55.6 MPa and the elongation at break is 260.4%,and the ultraviolet shielding ability reaches 58.8%.The elongation at break is 43.7%and 5.0% higher than that of g PVB while the ultraviolet shielding ability is nearly double that of g PVB.Additionally,the visible light transmittance remains at 88%.The functionalized graphene modified PVB composite films(YPVB-m GO,g YPVB-m GO)were prepared by in-situ composite method.It was found that the in-situ composite method further improved the compatibility of m GO with the matrix,enhanciing the interfacial interaction.So,the composite film material showed more excellent mechanical properties.Among them,when the s GO content is 0.03 wt%,the tensile strength of the composite reaches 59.8 MPa and the elongation at break is 237.0%,which are 49.3% and 7.7% higher than g YPVB,respectively.Compared with g YPVB,the ultraviolet shielding ability reaches 58.3%,which is nearly doubled.The visible light transmittance is 88.7%,which has the best comprehensive performance.