Effect of 3-aminopropyltriethoxysilane on properties of poly(butyl acrylate-co-maleic anhydride)/silica hybrid materials

The transparent poly(butyl acrylate-co-maleic anhydride)/silica [P(BA-co-MA n)/SiO2] has been successfully prepared from butyl acrylate-maleic anhydrid e copolymer P(BA-co-MAn) and tetraethoxysilane (TEOS) in the presence of 3- aminopropyltriethoxysilane (APTES) by an in situ sol-gel process. Triethoxy silyl group can be readily incorporated into P(BA-co-MAn) as pendant side c hains by the aminolysis of maleic anhydride unit of copolymer with APTES, a nd then organic polymer/silica hybrid materials with covalent bonds between two phases can be formed via the hydrolytic polycondensation of triethoxys ilyl group-functionalized polymer with TEOS. It was found that the amount o f APTES could dramatically affect the gel time of sol-gel system, the sol f raction of resultant hybrid materials, and the thermal properties of hybrid materials obtained. The decomposition temperature of hybrid materials and the final residual weight of thermogravimetry of hybrid both increase with the increasing of APTES. Scanning electron microscopy (SEM) and atomic forc e microscopy (AFM) showed that the morphology of hybrid materials prepared in the presence of APTES was a co-continual phase structure. (C) 1999 John Wiley & Sons, Inc.