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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Bioactivity and mechanical properties of PDMS-modified CaO-SiO_2TiO_2 hydrids prepared by sol-gel process
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Bioactivity and mechanical properties of PDMS-modified CaO-SiO_2TiO_2 hydrids prepared by sol-gel process

机译：溶胶-凝胶法制备PDMS改性的CaO-SiO_2TiO_2氢化物的生物活性和力学性能

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摘要

Hydrolysis and polycondensation of poly(dimethylsiloxane) (PDMS), tetraethoxysilane (TEOS), tetraiso-propyltitanate (TiPT), and calcium nitrate gave essentially pore- and crack-free transparent monolithics of PDMS-modified CaO-SiO_2TiO_2 hybrids, when PDMS/(TFOS + TiPT) was larger than 26:74 in weight, under constant ratios of TEOS/TiPT of 9:1 in mol and Ca/(TEOS + TiPT) of 0.15 in mol. Their apatite-forming abilities in a simulated body fluid, which is indicative of bioactivity, increased with decreasing PDMS/(TEOS + TiPT). Their extensibility and Young's modulus decreased and increased, respectively, with decreasing PDMS/(TEOS + TiPT). The hybrids with PDMS/(TEOS + TiPT) of about 30:70 in weight showed fairly high apatite-forming ability, high extensibilities, and Young's moduli almost equal to those of the human cancellous bones. These new kind of bioactive materials with unique mechanical properties may be useful as bone-repairing materials.
机译：聚二甲基硅氧烷（PDMS），四乙氧基硅烷（TEOS），四异丙基钛酸酯（TiPT）和硝酸钙的水解和缩聚反应使PDMS改性的CaO-SiO_2TiO_2杂化物具有基本上无孔和无裂纹的透明整体结构。在恒定比例的TEOS / TiPT为9：1摩尔和Ca /（TEOS + TiPT）为0.15摩尔的恒定比率下，TFOS + TiPT）的重量大于26:74。随着PDMS /（TEOS + TiPT）的降低，它们在模拟体液中形成磷灰石的能力（表明生物活性）增加。随着PDMS /（TEOS + TiPT）的降低，它们的可扩展性和杨氏模量分别降低和增加。 PDMS /（TEOS + TiPT）重量约为30:70的杂种显示出相当高的磷灰石形成能力，高延展性和杨氏模量，几乎与人的松质骨相同。这些具有独特机械性能的新型生物活性材料可用作骨修复材料。

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