本科毕业设计（论文）--聚乳酸复合材料结晶性能的研究.doc

编号本科生毕业设计( 论文) 题目: 聚乳酸复合材料结晶性能的研究化学与材料工程学院高分子材料与工程专业学号学生姓名指导教师二〇年摘要 I 摘要本文采用成核剂 VP101t 、共混型立构复合聚乳酸(SC-PLA) 和嵌段立构复合聚乳酸 PDLA-PLLA-PDLA(DLD-PLA) 作为成核剂, 制备聚乳酸/VP101t 、聚乳酸/SC-PLA 和聚乳酸/DLD-PLA 复合材料, DSC 和 XRD :三种物质都可提高 PLA 的结晶速率和结晶度; XRD 结果表明,三种物质的加入没有改变 PLA 的晶型. 通过溶液挥发法制备了不同配比的 T (SEM) 研 T 在 PLA 中的微观形态,T 在 PLA 基体中分散性较好,分别通过差示扫描量热仪(DSC) 、 X- 射线衍射(XRD) T 的加入对 PLA 的结晶、, CNT 的加入提高了 PLA 的结晶速率、结晶度和力学性能. CNT 在基体中的分散直接影响了 PLA 的性能,T 更好的分散在 PLA 基体中, T 的纳米复合材料. SEM 及 XRD 的结果均表明,与溶液挥发法比较,T 的团聚,达到较好地分散,并对其晶体结构、, CNT 的加入不但提高了 PLA 的结晶度,并且改变了结晶结构,促进 PLA 含量的增加, PLA 结晶度减小,但其热稳定性和力学性能却有较大的提高. 关键词: 聚乳酸;纳米复合;结晶;成核剂;碳纳米管 Abstract II ABSTRACT In this paper, polylactic acid (PLA) was modified by solution casting method using nucleating agents VP101t, plex (SC) PLA and triblock plex copolymer (DLD-PLA). The crystallization of posites were studied by using X-ray diffraction(XRD) and differential scanning calorimetry(DSC). It was shown that the crystallinity of posites was improved, although crystal forms did not change. T posites with T percent were prepared via solution casting method for the first time in this work. The micro-morphology of PLA posites was characterized by scanning electron microscopy(SEM). The influence T on the crystal structure, crystallinity and mechanical properties of PLA was investigated by X-ray diffraction(XRD), differential scanning calorimetry(DSC) and tensile test, respectively. SEM observation indicated T were dispersed in the PLA matrix very well. It was found that the presence T had enhanced significantly the crystallinity and mechanical properties, but did not change the crystalline structure. The micro-morphology T in the PLA matrix had strong effect on the properties of PLA. Solution coagulation method was used to prepare the T posites with T loadings percent so as to get the better dispersion. This method indeed refrained the agglomeration T pared to the solu