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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >An Evaluation of Mechanical Property and Microstructural Development in HAP-Ca Polycarboxylate Biocomposites Prepared by Hot Pressing
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An Evaluation of Mechanical Property and Microstructural Development in HAP-Ca Polycarboxylate Biocomposites Prepared by Hot Pressing

机译：热压法制备HAP-Ca多羧酸钙生物复合材料的力学性能和微观结构发展评价

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摘要

A hot-pressing technique was used to prepare composites anticipated to be biocompatible. Ca_4(PO_4)_2O (TetCP) was reacted with an acrylic-itaconic copolymer (CoP) in the absence of a solvent to form composites comprised of Ca_(10)(PO_4)_6(OH)_2, (hydroxyapatite, or HAp) and the Ca polyalkenoate salt. The effect of temperature, pressure, and hot-pressing time on the mechanical properties and microstructure of the composites were studied. Results showed that both tensile strength and elastic modulus increased when temperature and time were increased. When the compaction pressure was increased, these properties initially increased but decreased at high pressures. These variations in the mechanical properties were correlated with the microstructure of these composites. The mechanism of the reaction was also studied. Reaction starts when the copolymer is heated to above its T_g permitting it to flow and react with the TetCP grains. The COOH groups on the polymer are neutralized by Ca~(2+) ions liberated from the TetCP. At the end of reaction, a network of the Ca polyalkenoate salt is formed in which HAp crystals are embedded.
机译：使用热压技术来制备预期具有生物相容性的复合材料。在没有溶剂的情况下，将Ca_4（PO_4）_2O（TetCP）与丙烯酸-衣康体共聚物（CoP）反应，形成由Ca_（10）（PO_4）_6（OH）_2，（羟基磷灰石或HAp）和多烯酸钙盐。研究了温度，压力和热压时间对复合材料力学性能和微观结构的影响。结果表明，随着温度和时间的增加，拉伸强度和弹性模量均增加。当压实压力增加时，这些性能最初增加，但在高压下降低。机械性能的这些变化与这些复合材料的微观结构相关。还研究了反应机理。当将共聚物加热到高于其T_g时，反应开始，使其流动并与TetCP晶粒反应。聚合物上的COOH基团被TetCP释放的Ca〜（2+）离子中和。在反应结束时，形成了聚烯酸钙盐网络，其中嵌入了HAp晶体。

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