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以4,4′-亚甲基二环己基二异氰酸酯(H12MDI)、聚乙二醇、蓖麻油、1,4-丁二醇和具有生物活性的纳米羟基磷灰石(n-HA)为原料,采用预聚法制备了纳米羟基磷灰石/聚氨酯(HA/PU)复合材料,并对其力学性能和热性能进行了研究。结果表明:复合材料的拉伸强度和断裂伸长率随n-HA含量的增加而提高。当n-HA的质量百分数为30%时,复合材料的综合力学性能达到最佳,与纯PU相比,拉伸强度和断裂伸长率分别提高了186%和107%。动态力学分析得出复合材料的储能模量随n-HA质量百分含量的增加而显著上升。TGA试验表明HA/PU纳米复合材料的热稳定性能随n-HA的添加得到改善,而DSC分析显示n-HA的加入在一定程度上降低了PU软段的结晶度。这些结果均表明该n-HA/PU是一种有应用前景的组织工程材料。
Using 4,4’-methylene dicyclohexyl diisocyanate (H12MDI), polyethylene glycol, castor oil, 1,4-butanediol and biologically active nano-hydroxyapatite (n-HA) The nano-hydroxyapatite / polyurethane (HA / PU) composites were prepared by the prepolymerization method and their mechanical properties and thermal properties were studied. The results show that the tensile strength and elongation at break of the composites increase with the increase of n-HA content. When the mass percentage of n-HA is 30%, the composite has the best comprehensive mechanical properties. Compared with pure PU, the tensile strength and elongation at break increase by 186% and 107% respectively. Dynamic mechanical analysis shows that the storage modulus of composites increases significantly with the increase of n-HA mass fraction. TGA test showed that the thermal stability of HA / PU nanocomposites was improved with the addition of n-HA. DSC analysis showed that the addition of n-HA reduced the degree of crystallinity of PU soft segment to some extent. These results indicate that the n-HA / PU is a promising tissue engineering material.