摘要:随着社会的发展,传统的TPU不能满足人民日益增长的需求,为了扩大了TPU的应用范围,TPU改性研究显得尤为重要。本课题研究稀土原料不同形态结构对纳米稀土结构、表观形态等影响规律,并采用原位聚合方法,将不同形态(棒状、片状、花状)的纳米稀土引入到聚氨酯弹性体中。利用4f-5d稀土元素的电子特性,与聚氨酯弹性体中的极性基团进行配位反应,并研究纳稀土添加量对TPU基体的组成、微观结构和性能影响,得到综合性能优良的纳米改性TPU弹性体。实验结果表明,棒状氧化镧对TPU弹性体影响最为明显。并且当其添加量为0.5 wt%时,其断裂伸长率为733.6%,拉伸强度为49.1 MPa,DSC得出氨基甲酸酯的热分解温度为188℃,提高了22℃。57626
毕业论文关键词:聚氨酯弹性体;纳米稀土氧化物;形态结构;复合材料
Study on morphology and structure of nano rare earth oxide effects on TPU elastomer
Abstract: With the development of society, the traditional TPU can not meet the growing demand of the people, in order to expand the scope application of TPU, the research on TPU modification is very important. In this paper, we study the influence of structure, apparent morphology, and adopt in situ polymerization method, using 4f-5d electronic characteristics of rare earth elements, coordinate with polar groups in polyurethane elastomer, and study the influence of micro morphology, introduction and introduction amount on the composition, microstructure and properties of TPU matrix. The experimental results show that the effect of lanthanum oxide on TPU elastomer is the most obvious. When the addition amount is 0.5 wt%, the elongation at break is 733.6% and the tensile strength is 49.1 MPa, and the thermal decomposition temperature is 188℃, which is improved by 22℃.
Key Words: TPU; Nano Rare Earth Compounds; Coordination Structure;Composition
目 录
1.1 聚氨酯简介 1
1.1.1 聚氨酯定义 1
1.1.2 聚氨酯的结构 1
1.1.3 聚氨酯的性能 1
1.1.4 聚氨酯的用途 2
1.2 热塑性聚氨酯弹性体(TPU) 2
1.2.1 热塑性聚氨酯弹性体的性能 3
1.2.2 软段对性能的影响 4
1.2.3 硬段对性能的影响 5
1.2.4 发展趋势 5
1.3 聚氨酯弹性体的改性方法 6
1.3.1 丙烯酸酯改性 6
1.3.2 有机硅改性 6
1.3.3 环氧树脂改性 7
1.3.4 无机纳米粒子改性 7
1.4 选题依据 8
1.5 立题目的和意义 9
1.6 研究内容和目标 9
1.6.1 研究内容 9