聚乳酸滑石粉结晶动力学的研究汇总.doc

聚乳酸/滑石粉结晶动力学的研究 摘要：采用密炼机熔融混炼制备了聚乳酸（PLA）基生物降解材料，并以滑石粉（Talc）作为成核剂，聚乙二醇(PEG)为增塑剂，研究了它们单独以及共同对PLA结晶能力的影响。使用DSC和热台偏光显微镜研究了PLA/Talc、PLA/PEG和PLA/PEG/Talc共混体系的等温结晶动力学，对所得数据用Avrami方程进行了处理，并计算了其活化能，结果表明：随着Talc的不断加入，加快了成核速率和球晶生长速率，缩短了半结晶时间并降低了活化能，表明Talc是有效的成核剂。而PEG的不断加入，提高了其结晶温度区间，并且球晶尺寸变得更大、更加完善，说明PEG是一个很好的增塑剂。 关键词：聚乳酸；增塑剂；成核剂；等温结晶动力学  The Study of Crystallization Kinetics of PLA/Talc composites Abstract：The polylactic acid （PLA） based biodegradable materials were prepared by using internal mixer，which took the method of melt-mixing，Talcum powder （Talc） as nucleating agentas plasticizer. We were studied the influence of plasticizer and nucleating agent to the crystallization of PLA. The isothermal crystallization kinetics of PLA and its composites with Talc or PEG or both of them was analyzed by DSC and POM. Processing of the Talc obtained using the Avram equation and calculate its activation energy,The results showed that, With the addition of nucleating agent Talc， accelerated the nucleation rate and spherulite growth rate， shorten the half crysllization time and reduces the activation energy，That Talc is an effective nucleating agent. With the addition of plasticizer improved the crystallization temperature range, and the spherulite size become bigger、 more perfect, shows that PEG is a good plasticizer Key words： polylactic acid; plasticizer；nucleation agent; the isothermal crystallization kinetics  目 录 摘要 I Abstract II 目 录 III 1.绪论 1 1.1前言 1 1.2聚乳酸的合成、性能与应用 1 1.3聚乳酸结晶过程的研究方法 3 1.4 PLA结晶性能的研究进展 4 1.4.1 PLA/成核剂体系 5 1.4.2 PLA/增塑剂体系 6 1.5 PLA的结晶结构 7 1.6课题研究目的与意义 8 2.实验 9 2.1 实验原料 9 2.2 实验设备 9 2.3 样品制备 9 2.3.1 PLA/PEG 复合材料制备 9 2.3.2 PLA/Talc复合材料的制备 10 2.3.3 PLA/Talc/PEG复合材料的制备 10 2.4 P0M 测试 10 2.5 DSC测试 11 3.实验分析 12 3.1 POM图分析 12 3.1.1 PLA的POM图分析 12 3.1.2 PLA/PEG 的POM图分析 13 3.1.3 PLA/Talc的POM图分析 15 3.1.4 PLA/Talc/PEG 的POM图分析 17 3.2 DSC图分析 18 3.2.1 PEG对PLA等温结晶行为的影响 18 3.2.2 Talc对PLA等温结晶行为的影响 19 4.结论 24 4.1 PEG对PLA结晶行为的的影响 24 4.2 Talc对PLA结晶行为的的影响 24 4.3 PEG与Talc的协同效应对PLA结