为考察介孔纳米羟基磷灰石(MHA)/左旋聚乳酸(PLLA)复合材料的性能,以十六烷基三甲基溴化铵(CTAB)为模板合成MHA,采用溶液相分离结合粒子沥滤法制备了不同纳米粒子含量的MHA/PLLA多孔支架复合材料,考察了其抗压缩性能和淬断面微观结构.采用溶液浇注法制备了MHA/PLLA复合膜,并对其拉伸性能和拉伸断面微观结构进行了研究.FTIR、XRD、TEM和氮气吸附测试等结果显示:合成的MHA具有典型的晶体结构、介孔结构和较高的比表面积.力学测试结果显示:在发生10％压缩形变时,填料含量为1％、5％和10％的MHA/PLLA多孔支架复合材料的抗压缩强度随填料含量增加而提高,与相应含量的纳米羟基磷灰石(HA)/PLLA多孔支架复合材料相比,分别提高了约37.0％、67.7％和144.7％.在填料含量为5％和1o％时,MHA/PLLA复合膜的拉伸强度较HA/PLLA复合膜分别提高约38.7％和46.1％,拉伸模量分别提高约35.4％和14.5％.而且MHA/PLLA复合膜具有更高的断裂伸长率,填料含量为1％、5％和10％时断裂伸长率分别较HA/PLLA复合膜提高约91.3％、79.7％和96.1％.FESEM结果显示:尤其当填料含量较高时,MHA/PLLA多孔支架复合材料或复合膜中填料粒子分布较HA/PLLA中均匀.结果表明:与HA/PLLA复合材料相比,随着MHA含量增加,MHA/PLLA复合材料具有更好的力学性能,MHA在PLLA基体中分布相对更均匀.
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