PBAMDIHG体系TPU的制及性能研究.docxVIP

毕业论文PBA/MDI/HG体系TPU的制备及性能研究学生姓名： 学号： 系 部： 专 业： 指导教师： 二○一四年六月 诚信声明本人郑重声明：本论文及其研究工作是本人在指导教师的指导下独立完成的，在完成论文时所利用的一切资料均已在参考文献中列出。 本人签名： 年 月 日PBA/MDI/HG体系TPU的制备及性能研究 摘要：采用聚己二酸丁二醇酯二醇（PBA）、4,4′－二苯基甲烷二异氰酸酯（MDI）及1,6-己二醇（HG）为原料，通过预聚体法制备了硬段含量相同，软段分子量不同；软段分子量相同，硬段含量不同的热塑性聚氨酯弹性体。采用拉伸试验、硬度测试、旋转流变仪、热失重分析、X射线衍射、热变形维卡软化温度测定仪等研究手段研究了不同软段分子量及不同硬段含量TPU结构与性能关系。分析结果表明：PBA/MDI/HG体系TPU随着软段分子量的增加，拉伸强度、强度逐渐增大，断裂伸长率增大；随着硬段含量增加，拉伸强度、硬度逐渐增大，断裂伸长率增大；随着软段分子量的增加，TPU热稳定性越来越好， 软段分子量为3000的TPU初始分解温度达到了293.7℃；随着软段分子量的增加，TPU抗热变形能力增强，软段分子量为3000的TPU具有较高的抗热变形能力，维卡软化点温度达到103℃；结晶性能分析表明TPU具有一定的结晶性能；流变性能分析结果表明TPU表现出典型的假塑性流体的特征。关键词：热塑性聚氨酯，聚己二酸丁二醇酯二醇，预聚体法，旋转流变仪，结晶性能 Preparation and Properties of TPU in PBA/MDI/HGAbstract: In this paper, different thermoplastic polyurethane elastomer were prepared by poly-1,4-butylene adipate glycol (PBA), methylene diphenyl diisocyanate (MDI) and 1,6-hexanediol (HG). The effects of the same molecular weight of soft segment, while the hard segment content were different and the same hard segment content, while the soft segment molecular weight were different on the relationships between the structures and properties of TPU were systematically studied by means of tensile testing, shore hardness testing, rotational rheomiter, TG, X-ray testing, etc. The results showed that with the increase of the soft segment molecular weight, the tensile strength and the shore hardness increased obviously, and the elongation at break increased obviously. And with the increase of the hard segment content, the tensile strength and the shore hardness increased obviously, and the elongation at break increased obviously. With the increase of soft segment molecular weight, the thermal stability of TPU got better. The initial decomposition temperature of TPU (the soft segment molecular weight was 3000) reached 293.7 ℃. With the increase of soft segment molecular weight, the deformation resistance ability of TPU got better. The vicat softening temperature of TPU (the soft segment molecul