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采用原位沉析与原位聚合的方法制备了聚甲基丙烯酸甲酯(PMMA)/聚乙丙交酯(PLGA)/羟基磷灰石(HA)三元复合材料,并对其组成、结构进行了表征,对其热稳定性、力学性能及离子稳定性进行了研究。结果表明:在聚合物生成时,同步原位沉析出的HA晶体结构与纯HA特征峰一致;三元复合材料中HA与PMMA以—O—H形式形成键接,有利于提高无机有机相间的界面结合强度;与普通机械共混法相比,复合材料的热稳定性、拉伸强度及断裂伸长率均明显提高,当HA用量为15%时,复合材料的拉伸强度、断裂伸长率及冲击强度同时达到最大值;无机离子Ca~(2+)、PO_4~(3-)在模拟体液中的溶出率明显降低。
Poly (methyl methacrylate) (PMMA) / polylactide (PLGA) / hydroxyapatite (HA) ternary composites were prepared by in situ precipitation and in situ polymerization, and their composition, structure Were characterized and their thermal stability, mechanical properties and ionic stability were studied. The results show that the crystal structure of HA precipitated by simultaneous in-situ precipitation is in agreement with that of pure HA during the polymer formation. HA and PMMA bond in the form of -O-H in ternary composites, Compared with the conventional mechanical blending method, the thermal stability, tensile strength and elongation at break of the composites were significantly improved. When the amount of HA was 15%, the tensile strength, elongation at break And the impact strength reach the maximum at the same time. The dissolution rates of inorganic ions Ca 2+ and PO 4 3- in the simulated body fluid obviously decrease.