It has been revealed that PDMS-CaO-SiO2-TiO2 hybrids show both apatite-forming ability and flexibility. However, these hybrids degrade in body environment, especially when their CaO contents are high. In the present study, a CaO-free PDMS-TiO2 hybrid was prepared by sol-gel method and treated with hot water. Before the hot water treatment the hybrid was amorphous, whereas anatase was precipitated by the hot water treatment in the hybrid. The as-prepared hybrid did not form apatite on its surface in a simulated body fluid, whereas it formed apatite after the hot water treatment. It is considered that apatite formation is induced by anatase precipitated by the hot water treatment. Both its tensile strength and Young's modulus decreased, however strain at failure increased by the hot water treatment. It is considered that dispersed TiO2 is segregated, aggregated, transformed into anatase, and the matrix of the hybrid is enriched with PDMS by the hot water treatment. A highly flexible material with apatite-forming ability was obtained by the present method.
|Number of pages||4|
|Journal||Key Engineering Materials|
|Publication status||Published - 2002|
|Event||14th International Symposium on Ceramics in Medicine-Annual Meeting of the International Society for Ceramics in Medicine BIOCERAMICS'01 (ISCM) - Palm Springs, CA, United States|
Duration: 2001 Nov 14 → 2001 Nov 17
- Hot Water Treatment