Acrylic resin/titania organic-inorganic hybrid materials were successfully prepared by the in situ polymerization of acrylic monomers as well as by blending the synthesized thermoplastic acrylic resins with titania sals which were first prehydrolyzed from the precursor of Ti(On-Bu)4．Effects of the amount of water and acid used for the preparation of TiO2 sols

the —COOH content in the acrylic resin and preparing methods on the structure of hybrid materials were investigated The Soxhlet extracting experiments proved that erosslinking reactions took place between the organic phase and the inorganic phase．leading to homogenous and transparent hybrid systems．Meanwhile．higher —COOH content resulted in higher crosslinking degree．The SAXS results showed that there existed titania networks with a loose structure and nano-scale size within the hybrids．Moreover

larger amount of water and acid in the sol-gel process led to larger size and denser titania organic phase In comparison with the in situ polymerization

blending method could prepare more homogeneous hybrids with mono-dispersed titania.