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首页> 外文会议>13th International Symposium on Ceramics in Medicine and the Annual Meeting of the International Society for Ceramics in Medicine 22-26 November 2000 Bologna, Italy >Bioactivity and mechanical Behavior of PTMO-Modified CaO-SiO_2 Hybrids Prepared by Sol-Gel Process
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Bioactivity and mechanical Behavior of PTMO-Modified CaO-SiO_2 Hybrids Prepared by Sol-Gel Process

机译：溶胶-凝胶法制备PTMO修饰的CaO-SiO_2杂化体的生物活性和力学行为

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摘要

Triethoxysilyl-terminated polytetramethylene oxide (Si-PTMO)-modified CaO-SiO_2 hybrids were prepared by hydrolysis and polycondensation of Si-PTMO, tetraethoxysilane (TEOS) and calcium nitrate. The effects of CaO and Si-PTMO contents on the bioactivity and mechanical behavior of the hybrids were investigated. The apatite-forming ability which is indicative of bioactivity was evaluated in a simulated body fluid (SBF) and the mechanical properites including strength, Young's modulus and strain at failure were measured in air by tensile testing. As for the series of the samples with a fixed weight ratio, (Si-PTMO) / (TEOS) = 2/3, the apatite-forming ability in SBF remarkably increased with increasing CaO content, although the tensile strength and Young's modulus decreased. The hybrid sampel with (Ca(NO_3)_2)/(TEOS) = 0.15 in molar ratio formed the apatite on its surface within only one day. For this series of samples, the strain at failure was found to be about 30 percent and almost independent of a CaO content. As for the series of the samples with a fixed molar ratio, (Ca(NO_3)_2/(TEOS) = 0.15, the straina t failure increased with increasing Si-PTMO content, but the apatite-forming ability, tensile strength and Young's modulus decreased. Thus, the synthesis of the hybrids exhibiting both high apatite-forming ability and high capability for deformation can be achieved by selecting suitable CaO and Si-PTMO contents. These hybrids may be useful as new kind of bioactive bone-repairing materials.
机译：通过Si-PTMO，四乙氧基硅烷（TEOS）和硝酸钙的水解和缩聚反应，制备了三乙氧基甲硅烷基封端的聚四亚甲基氧化物（Si-PTMO）改性的CaO-SiO_2杂化物。研究了CaO和Si-PTMO含量对杂种的生物活性和力学行为的影响。在模拟体液（SBF）中评估了指示生物活性的磷灰石形成能力，并通过拉伸试验在空气中测量了包括强度，杨氏模量和断裂应变在内的机械性能。对于重量比固定的系列（Si-PTMO）/（TEOS）= 2/3，尽管抗拉强度和杨氏模量降低，但随着CaO含量的增加，SBF中磷灰石形成能力显着提高。摩尔比为（Ca（NO_3）_2）/（TEOS）= 0.15的混合样品仅在一天之内就在其表面形成了磷灰石。对于这一系列样品，发现破坏时的应变约为30％，几乎与CaO含量无关。对于固定摩尔比（Ca（NO_3）_2 /（TEOS）= 0.15）的系列样品，应变破坏随着Si-PTMO含量的增加而增加，但是磷灰石形成能力，拉伸强度和杨氏模量因此，通过选择合适的CaO和Si-PTMO含量，可以合成具有高磷灰石形成能力和高变形能力的杂化物，这些杂化物可作为新型的生物活性骨修复材料。

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