聚乳酸(PLA)及PLA/羟基磷灰石多孔支架的制备及性能

被引:0
作者
吴述平
机构
[1] 湖北工业大学
关键词
聚乳酸; 组织工程; 多孔支架; 粒子沥滤; 羟基磷灰石;
D O I
暂无
年度学位
2011
学位类型
硕士
导师
摘要
近年来,可生物降解高分子多孔支架已广泛用作各种再生新组织模板,组织工程要求支架有着良好的相互连通、高度开放的多孔结构,以实现细胞的增殖和分化。因此,如何把材料加工成满足生物体要求的结构至关重要。在多孔支架的诸多制备方法中,溶剂浇铸/粒子沥滤法(SC/PL),因为对实验设备和实验条件要求较低,支架的孔隙率和孔径大小可控等诸多优点,从而成为应用最为广泛的制备方法之一。但SC/PL方法也有很明显的缺点,如溶剂挥发过程中支架体积发生收缩,致使传统的SC/PL方法只适合制备薄层的多孔膜。 本论文采用本课题组发明的溶剂浇铸/真空挥发/粒子沥滤方法(SC/VV/PL),以氯化钠为致孔剂、氯仿为溶剂,分别制备了聚乳酸(PLA)和PLA/羟基磷灰石(HA)复合多孔支架,并对支架的孔的结构、孔隙率、孔径大小、力学性能、亲水性能等进行了测试,测试结果表明:当氯化钠的粒径分布较宽时,能够获得孔-孔连通性良好的多孔支架;支架的孔径可以通过调节氯化钠的粒径进行控制,而孔隙率和压缩模量则可以通过调节氯化钠的用量进行控制;MTT法细胞毒性测试结果不仅证实了PLA支架对实验细胞的生长无毒性,且表明SC/VV/PL方法能完全去除支架中的NaCl粒子和溶剂;压缩模量、接触角、吸水率的测试结果表明,PLA中加入HA后,支架的压缩模量和亲水性能得到了显著改善。以上研究结果证实了SC/VV/PL方法能够成功制备结构可控、性能可调的三维多孔支架,克服了传统的SC/PL方法只能制备不超过2mm厚的多孔膜的缺点,且具有操作简便、实验设备简单等特点。
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