コロイダルシリカを含有した生体活性な有機-無機ハイブリッド材料の微構造と機械的特性

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Synthesized through sol-gel processing were Ormosil type hybrid gels containing varied mass fractions of colloidal silica, poly (dimethylsiloxane) (PDMS), tetraethoxysilane (TEOS) and calcium nitrate. Viscoelasticity, mechanical strength and _<29>Si MAS NMR spectra were measured, and in vitro apatite deposition in a simulated body fluid (SBF) of the Kokubo recipe was examined. The relative height of a T_g peak at about - 100℃ in tan σ versus temperature curves grew with the colloidal silica content. This peak growth was accounted for the relative increase in PDMS-colloidal silica interactions. As the increase in the compressive strength followed the increase in colloidal silica content, the number of PDMS-silica bonds and hydrogen bond of colloidal silica increased due to the NMR spectra and tan σ curve. Thus, mechanical strength was dependent on PDMS-silica bonds and the hydrogen bond of colloidal silica. On the other hand, as the relative PDMS content increased, the number of PDMS-silica bonds was little influenced while PDMS chain structure increased. The gel (with a molar ratio TEOS:PDMS:H_2O:HCl:Ca(N0_3)_2・4H_2O = 1:0.48:5.0:0.9:0.10) containing 14mass% colloidal silica (CS_<14>P_<0.48>Ca_<0.10>) exhibited the highest maximum failure strain (about 70%) among all samples. Thus, the relative content of PDMS chain structure depending on PDMS content influenced the maximum failure strain. CS_<14>P_<0.48>Ca_<0.25> could not deposit apatite within 7 d after soaking in SBF, while PDMS/TEOS = 0.24 (molar ratio) could deposit apatite within 3 d. The increase in PDMS content restrained the dissolution of Ca ions.
2003-04-01

コロイダルシリカを含有した生体活性な有機-無機ハイブリッド材料の微構造と機械的特性

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