Interpenetrated inorganic-organic composite materials can be synthesized by twin polymerization Of (mu(4)-oxido)hexakis(mu-furfuryloxo)octakis(furfuryloxo)-tetra-titanium. Poly(furfuryl alcohol)/titanium dioxide composites are formed in which the titania species are uniform dispersed. Pure nanosized titanium dioxide (anatase) is obtained after heat and water treatment and removing the organic layer of the composite materials by oxidation.