Repeat step-scan DSC对聚合物可逆熔融性能的研究

论文摘要

由于高分子晶体具有一定的亚稳定性,所以它们可以在低于平衡熔点的温度下熔融,同时晶体又可以增长,即表现出可逆的熔融和结晶现象。为了进一步了解复杂的化学结构、不同的热处理和化学组成对样品可逆熔融现象的影响,本课题利用反复阶梯扫描（repeat step-scan）方法分别对Branched PE、不同冷却速率下的HDPE及不同共聚物组成的PE-b-PEP进行了研究。Branched PE是一种化学结构十分复杂的大分子,研究中发现:通过repeat step-scan扫描所得到的the cooling线与the second heating线在熔融区间的某些温度范围内并不重合,而是有一定程度的分离。为了进一步研究此现象,本课题又对Branched PE进行了两次Repeat step-scan方法扫描,发现所得到的the cooling线和the second heating线在同样的熔融温度范围内仍然存在分离现象,这表明在熔融区间,BranchedPE并不是在所有的温度范围内都存在可逆熔融现象。在不同热处理对可逆熔融现象影响的研究中,本文发现HDPE在三种冷却速率（0.1℃/min、1℃/min和10℃/min）下都表现出了十分明显的可逆熔融现象,并且冷却速率越大,样品the first heating线上的总相变焓、the second heating线上的可逆熔融焓以及相对可逆度就越大,同时,the first heating和the second heating两线的热容值也都很大。通过对不同组成的嵌段共聚物PE-b-PEP（E12EP88、E29EP71和E 54EP46）的可逆熔融现象的研究,本课题发现:由于具有稀释作用的无规EP含量太高,E12EP88的结晶能力十分微弱,基本失去可逆熔融性能。但具有一定结晶能力的E54EP46和E29EP71在熔融区间都表现出较明显的可逆熔融现象;相对于E54EP46,E29EP71 the first heating线上的总相变焓、the second heating线上的可逆熔融焓以及the first heating和the second heating的热容值都较小,但是它的相对可逆度却很大。

论文目录

摘要

ABSTRACT

第一章前言

1.1 DSC差热扫描量热法

1.2 两种新型的DSC热分析技术

1.2.1 TMDSC热分析技术

1.2.2 Step-scan DSC热分析技术

1.3 DSC在高聚物研究中的应用

1.3.1 传统DSC（Normal DSC）在高聚物中的应用[12]

1.3.2 TMDSC在高聚物中的应用

1.3.3 Step-scan DSC在高聚物中的应用

1.4 可逆熔融现象

1.4.1 TMDSC对可逆熔融现象的研究

1.4.2 TMDSC存在的问题

1.5 PE的有关研究

1.5.1 PE的晶体理论研究

1.5.2 PE的相态模型

1.5.3 Branched PE的研究

1.5.4 HDPE的研究

1.5.5 PE共聚物的研究

1.6 本课题的研究意义及思路

第二章实验部分

2.1 实验设备及相关附件

2.2 实验样品

2.3 DSC测试所用固体样品的制备

2.4 Pyris Diamond DSC简介

2.5 DSC测试

2.5.1 Normal-scan DSC测试

2.5.2 Step-scan DSC测试

2.5.3 Repeat step-scan DSC测试

2.6 DSC测试的数据处理

2.6.1 Step-scan DSC测试的数据处理

2.6.2 温度校正

2.6.3 热容校正

第三章 Branched PE复杂热力学性质的研究

3.1 Branched PE的Normal DSC测试

3.2 Branched PE的Step-scan DSC测试

3.3 Branched PE的repeat step-scan DSC测试

3.4 Branched PE的两次repeat step-scan DSC测试

3.5 小结

第四章不同冷却速率的HDPE的复杂热力学性质研究

4.1 不同冷却速率下的HDPE的Normal扫描

4.2 Repeat step-scan方法对不同冷却速率下HDPE可逆熔融的研究

4.3 不同冷却速率下的HDPE的repeat step-scan DSC结果比较

4.4 小结

第五章 PE-b-PEP嵌段共聚物的复杂热力学性质研究

5.1 用Step-scan DSC方法对不同组成的PE-b-PEP研究

5.2 Repeat step-scan DSC方法对PE-b-PEP可逆熔融现象的研究

5.3 不同组成含量的PE-b-PEP嵌段共聚物的repeat step-scan结果比较

5.4 小结

第六章全文主要结论

参考文献

致谢

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标签：差示扫描量热仪论文; 反复式阶梯扫描法论文; 聚乙烯论文; 可逆熔融论文;

Repeat step-scan DSC对聚合物可逆熔融性能的研究

论文摘要

论文目录

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