高岭土杂化改性端羧基聚乳酸复合材料的制备与性能研究-化学专业论文.docxVIP

采用梯度升温法，直接熔融合成端羧基聚乳酸共聚物P(LA／SA)，接着用 1，3．PBO(2,2．(1，3．亚苯基)．二恶唑啉)对共聚物进行扩链，制得聚酰胺酯 (PEA)，最后将高岭土与PEA熔融复合改性。红外图谱和核磁图谱数据 表明，聚乳酸中的—COOH与二恶唑啉成功合成出目标产物。研究得出， 以丙交酯为原材料，丁二酸酐为亲水改性剂，l，3．PBO为扩链剂合成聚乳 酸的最佳工艺条件为在0．098MPa，150℃下，力(丁二酸酐)：刀(丙交 酯)=1：9．5，刀(丙交酯)：n(1，3．PBO)=1：2．4，扩链反应时间为1h，制得扩 链产品聚酰胺酯PEA。GPC测出该条件下产物的相对分子质量最大为24 万。玻璃化转变温度数据表明扩链后的聚乳酸和复合改性后的耐热性能均 提高。拉伸强度测试说明复合材料的力学性能得到提升。电子扫描图表明 成功地将聚酰胺酯颗粒插入到高岭土片层之间。 (3)高岭土改性聚乳酸基复合材料的制备。本实验采用原位聚合法制 备高岭土／PLEA(聚酰胺酯)纳米复合材料。首先制备出分子量较小的的端羧 基聚乳酸P(LA／SA)，其次合成出插层复合物高岭土／--甲亚砜，一定温度 减压原位扩链聚合45 min，制备PLEA／高岭土复合材料。根据前面所述的实 验步骤将PLEA与不加高岭土／--甲亚砜复合物合成的产物作比较。研究发 现，实验成功的以1，3．PBO作为扩链剂，制备出了高岭土改性聚乳酸基复合 材料，并确定在m(P(LA／SA))：m(高岭土／--甲亚砜)=1：1．2，聚合温 度为160℃，反应时间为十-4,时时所得到的的高岭土／PLEA复合材料的 各种性能得到了显著的提高，高岭土改性后的高岭土／PLEA复合物的耐热 性得到提高。 关键词t聚乳酸，二恶唑啉，聚酰胺酯，扩链，高岭土复合材料 万方数据  KAoLIN HYBIUD MODIFIED THE PREPAR ATIoN AND PERFORMANCE STUDY OF THE END CARBoXYL POLyLATIC ACID COMPoSITE ⅣIATERlAL ABSTRACT Polylactic acid(PLA)is a kind of green materials，but also a renewable plant resources for the new biodegradable synthetic raw materials．In vivo or in the soil，the role of microorganisms in the poly-lactic acid degrades to lactic acid， the last metabolites into carbon dioxide and water．Because of its good chemical inertness，easy to machining，good biological compatibility and biodegradable properties，in the body Can be gradually degraded into carbon dioxide and water, and there has not pollution to the environment,the polylactide and its copolymers has been attached great importance to both at home and abroad in the pharmaceutical and medical supplies applications and development．The significance of polylactic acid application is not only reflected in environmental protection，for recycling economy and building a conservation-oriented society will also have a positive effect．This paper studies the preparation and kaolin terminal carboxyl—modified polylactic acid／polylactic acid compound material preparation． (1)Preparation and polylactic acid lactide．This article USeS two-step， condensation