Zheng Xiaotong, Zhou Shaobing, Li Xiaohong, Weng Jie
School of Materials Science and Engineering, Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, PR China.
Biomaterials. 2006 Aug;27(24):4288-95. doi: 10.1016/j.biomaterials.2006.03.043. Epub 2006 May 3.
Poly(D,L-lactide) (PDLLA) and Hydroxyapatite (HA) are compounded, which possess biodegradation, biocompatibility and shape memory properties. In the paper, we prepared serial imposing shape memory composites with different shapes, composite ratios and sample thicknesses. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) were carried out to examine surface morphology, glass transition temperature (Tg), dynamic mechanical properties, and shape memory effect of PDLLA/HA composites, respectively. Moreover, some interesting shape memory behaviors were investigated. The results show that the better disperse morphology of HA grains using the experiment methods, and PDLLA/HA composites at a definite range of compound ratio have much better shape memory effect than pure PDLLA polymer. It indicates that HA particles can improve shape memory effect and PDLLA/HA composites are potential for biomedical applications.
聚（D，L-丙交酯）（PDLLA）与羟基磷灰石（HA）复合，它们具有生物降解性、生物相容性和形状记忆性能。在本文中，我们制备了具有不同形状、复合比例和样品厚度的系列施加形状记忆复合材料。分别进行扫描电子显微镜（SEM）、差示扫描量热法（DSC）和动态力学分析（DMA）来研究PDLLA/HA复合材料的表面形态、玻璃化转变温度（Tg）、动态力学性能和形状记忆效应。此外，还研究了一些有趣的形状记忆行为。结果表明，采用实验方法HA颗粒具有更好的分散形态，并且在一定复合比例范围内的PDLLA/HA复合材料比纯PDLLA聚合物具有更好的形状记忆效应。这表明HA颗粒可以改善形状记忆效应，并且PDLLA/HA复合材料在生物医学应用方面具有潜力。
