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海藻酸钙水凝胶/聚乳酸复合材料的制备与性能

, PP. 87-92

Keywords: 海藻酸钙,聚乳酸,水凝胶,原位相转变,软骨细胞

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Abstract:

通过化学发泡-冷冻干燥-粒子滤出复合法制备聚乳酸(PLLA)大孔支架,然后在大孔内以海藻酸钠(SA)、碳酸钙、葡萄糖酸内酯(GDL)为原料,通过原位相转变制备海藻酸钙水凝胶/聚乳酸复合材料(CA/PLLA);分别利用SEM、压缩强度测试和细胞培养对CA/PLLA支架的形貌、力学性能及生物相容性进行了研究。结果表明:PLLA具有直径小于2mm、孔道相互连通的孔洞,且在大孔中能够形成均匀的CA。CA/PLLA复合材料的压缩强度(2.74MPa)远大于单一的海藻酸钙水凝胶的压缩强度(0.10MPa)。在CA/PLLA复合支架中,软骨细胞呈簇状圆形生长状态,与其在天然软骨陷窝里生长状态一致。这种软硬结合、天然与合成高分子杂化的CA/PLLA复合材料的力学强度和生物相容性同时得到提高,可进一步作为骨和软骨修复材料研究。

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