毕业论文 初稿：（对学弟们特别是大四的应该有一点参考价值，虽然写得不很好）.doc

北方民族大学 学士学位论文 论文题目: PHB基复合纤维的组分共混形态分析 院(部)名 称: 材料科学与工程 学 生 姓 名: 专 业: 高分子材料与程 学 号: 2007 指导教师姓名: 论文提交时间: 2011年5月15日 论文答辩时间: 2011年5月21日 学位授予时间: 北方民族大学教务处制 摘 要 聚β-羟丁酸(PHB)是一种广泛存在于许多微生物细胞中的天然用高分子聚合物，具有良好的生物可降解性、生物相容性、压电性、光学活性等特殊性质。因而，PHB成为新型的组织工程支架材料，用于软骨、皮肤、心脏瓣膜等组织工程方面。但PHB的脆性大，降解时间长等方面不足，促使人们用其它生物可降解材料与PHB共混改善其性能。在共混体系中，共混组分的形态对共混物的性能有着重要的影响。 本实验主要以PHB为基体，聚乳酸（PLLA)为主要共混组分，再加入另一种生物降解材料PEO作为改性剂，将其通过溶液纺丝的方法制备出不同共混组分比例的PHB/PLLA/PEO复合纤维。XRD手段分析利用扫描电子显微镜（SEM）复合纤维的表面采用水和丙酮复合纤维相，各组分在纤维中的共混形态。 实验结果表明晶型纤维中PHB的结晶程度随PHB含量增大而依次升高结晶程度复合纤维的结构基质-原纤型形态相态是海岛结构 关键字：聚β-羟丁酸酯，聚乳酸，复合纤维，共混，基质-原纤型形态ABSTRACT Poly-phydroxybutyrate(PHB) is a kind of natural polymer which widely exists in many microbial cells, with good biodegradation, biocompatibility, piezoelectricity, optical activity as well as special qualities. Therefore, PHB become a new tissue engineering scaffolds materials, used in cartilage, skin, heart valve etc tissue engineering. But the shortages such as the brittleness is big, degradation time is too long and so on, drives people to use other biodegradable materials blend with PHB to improve its properties. In blending system, the morphology of blending components has great effect on the perfor- mance of the blend . In this experiment, PHB mainly act as matrix and PLLA as the main blending comp- onents, and another PEO biodegradable materials was added as the modifier, then we can gain the PHB/PLLA composite fiber with different component ratio of blend through the solvent spinning method. And by means of XRD to analysze the interaction among each blending components, and do with scanning electron microscope (SEM) that we analysis the morphology of composite-fibers surface . Meanwhile, we dissolve out one components of composite fiber