摘要在常压下水解聚酰胺 6/聚乙二醇（PA6/PEG）制备共聚物是一种较为普遍的方法， 本次实验通过改变 PEG 的加入量来研究 PEG 对 PA6 的改性效果。用傅里叶红外光谱 (FTIR)来分析研究了材料的特征基团；用热重法（TG）分析了不同的 PEG 配比下的 合成材料的热稳定性；用差示扫描量热仪（DSC）测得材料的熔点、结晶温度和结晶 度；用万能拉伸机进行拉伸实验测得聚合物相关的力学性能和塑性性能。结果表明： PEG 与 PA6 在加热搅拌状态下通过引发剂、催化剂等可发生共聚反应生成一种弹性 体；PEG 的加入会使聚合物的起始分解温度降低，聚合物的热稳定性也会降低，PEG 的含量越高生成聚合物的热稳定性越低；PEG 链段的加入会破坏原 PA6 分子链的规 整性，使聚合物的结晶度降低，熔点也略有所降低；纯 PA6 的断裂伸长率能够达到 13%，而改性后的共聚物的断裂伸长率高达 202%，这表明材料的韧性显著地提高， 达到了很好的增韧效果，但是材料的拉伸强度也大幅度下降。81234

毕业论文关键词：水解聚合;聚酰胺 6;聚乙二醇;改性

Abstract Polyamide6/polyethylene glycol(PA6-co-PEG) copolymerhad been prepared via hydrolytic polymerization。The modification effect of PEG on PA6 was studied by changing the amount of PEG added。Thecharacteristic groups of the materials were analyzed by using of Fourier transform infrared spectroscopy (FTIR)。The thermal stability of the composite materials with different PEG ratios was analyzed by the method of thermal gravimetric method (TG)。The melting point, crystallization temperature and crystallinity  of the materials were measured by differential scanning calorimetry (DSC)。Mechanical  and plastic properties of the polymers were measured by using of universal tensile machine。

The results show that PEG and PA6 can produce a kind of elastomer by copolymerization reaction under the condition of heating and stirring by initiator, catalyst and so on。The addition of PEG can reduce the initial decomposition temperature and the thermal stability of the polymer。The higher the content of PEG, the lower the thermal stability of the polymer。The addition of PEG chain can destroy the regularity  of  the original PA6 molecular chain, reduce the crystallinity of the polymer and the melting point of the polymer, but the crystallization ability of the molecule can be improved。 The elongation at break of the pure PA6 could reach 13%, and the elongation at break of the modified copolymer was as high as 202% which indicates that the toughness of  the material significantly increased, and achieved anexcellent toughening effect, but the tensile strength of the material is also significantly decreased。

Keywords: Hydrolytic polymerization; Polyamide 6; Polyethylene glycol; Modification

目录

第一章绪论 1

1。1 前言 1

1。2 聚酰胺 1

1。2。1 聚酰胺的发展历史 1

1。2。2 聚酰胺的分类 2

1。2。3 聚酰胺的性能 2

1。3  聚酰胺 6 3

1。3。1 聚酰胺 6 的发展历史 3

1。3。2 聚酰胺 6 的性质介绍 3

1。3。3 聚酰胺 6 的应用 3

1。3。4 聚酰胺 6 的合成工艺 4

1。3。5 聚酰胺 6 的改性介绍 5

1。4 聚醚简介 8

1。4。1 聚乙二醇简介