纳米HA/PU复合材料的力学性能和热性能

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n2 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。 

Mechanical and thermal properties of nano-hydroxyapatite/polyurethane composites

Aliphatic polyurethanes based on 4, 4′-dicyclohexylmethane diisocyanate ( H12MDI), poly ( ethylene glycol) (PEG), castor oil (CO), 1, 4-butandiol (BDO) and bioactive nano-hydroxyapatite (n-HA) were selected to prepare a nanocomposite by the prepolymerization method. The mechanical and thermal properties of the nano-composites were investigated. The results show that the tensile strength and broken elongation of the nano-composites are all reinforced with the addition of nano HA particles. When incorporation of 30 wt% n-HA into PU matrix, the tensile st rength and broken elongation increase by 186 % and 107 % compared to those of pure PU, respectively, which reach the maximum values. The storage modulus of the composites increases obviously with the increase of n-HA loading. The nano composites exhibit improved thermal stability with the incorporation of HA nanoparticles, and the differential scanning calorimetry (DSC) indicates that the incorporation of n-HA can hinder the crystallization process of PU. These results suggest that the n-HA/PU composite might be a prospective material for future applications in tissue engineering.