基于碳纳米管的聚甲醛成核剂的设计与合成

摘要本文将不同含量的多壁碳纳米管(Multi walled carbon nanotubes, 简称 MWCNTs)作为添加剂，通过简单的熔融共混制备出具有优异性能的 POM 共混物，而 MWCNTs 由于其独特的由同心石墨烯圆柱体组成的中空结构，表现出非凡的物理和机械性能。因此，本文设计通过加入 MWCNTs 使 POM 进行异相成核，缩小聚合物球晶的尺寸，提高聚合物的结晶速率，改善其机械强度以及热稳定性能。但加入 MWCNTs 的 POM 共混物，其断裂伸长率降低，因此本文设计选取综合性能较优异的 POM 共混物，与不同含量的热塑性聚氨酯弹性体(Thermoplastic polyurethane,简称 TPU)三元共混，改善 MWCNTs 与 POM 的相互作用实现有效分散和成核，希望最终能够提高得到综合性能优异的 POM 复合材料。通过对共混物的相关性能进行表征，可以明显发现，MWCNTs 的加入使得结晶速率加快，球晶变小，拉伸强度提高，热稳定性提高；随着 TPU 的加入，球晶增大，热稳定提高，韧性呈增强趋势。88699

毕业论文关键词：聚甲醛；多壁碳纳米管；热塑性聚氨酯弹性体；成核；结晶

Abstract In this paper, multi-walled carbon nanotubes (MWCNTs) were used to fabricate high performance POM composite by melt processing。 MWCNTs exhibit excellent physical and mechanical properties because of the unique hollow structure consisting of concentric graphene cylinders。 Herein, MWCNTs were introduced into POM matrix in order to induce the heterogeneous nucleation of POM, reduce the size of spherulites, improve the crystallization rate as well as the mechanical strength and thermal stability。 Results show that the combination of MWCNTs obviously increases the crystallization temperature of POM matrix, but reduces the toughness because of MWCNTs agglomeration。 Thus, the thermoplastic polyurethane (TPU) was chosen as ternary component to improve the interaction between MWCNTs and POM。 Hopefully, TPU can improve the toughness and tensile strength of POM。 According to the results, it can be clearly found that despite of increasing size of spherulites, the thermal stability as well as toughness increased with the addition of TPU, that is to say that higher performance POM composite was produced by the combination of MWCNTs and TPU。源Q于D优G尔X论V文Y网wwW.yOueRw.com 原文+QQ75201`8766

Keyword: Polyoxymethylene(POM); carbon nano-tube(CNTs); Thermoplastic polyurethane(TPU); Nucleation; Crystallization; Property

摘要 2

Abstract 3

目录 4

第 1 章绪论 5

1。1 聚甲醛概述 5

1。2 聚甲醛的增韧改性以及成核剂研究 5

1。2。1 聚甲醛的增韧改性研究 5

1。2。2 聚甲醛的成核剂研究 5

1。3 本文设计研究的目的 6

第 2 章多壁碳纳米管/聚甲醛共混物的制备与表征 7

2。1 前言 7

2。2 实验部分 7

2。2。1 主要原料From优T尔K论M文L网wWw.YouERw.com 加QQ75201^8766 及试剂 7

2。2。2 主要仪器设备基于碳纳米管的聚甲醛成核剂的设计与合成:http://www.youerw.com/cailiao/lunwen_165490.html