聚乙烯接枝马来酸酐共聚物的制备及结晶动力学的研究

材料科学论文编号:CL088  论文字数:9212,页数:29

 目  录
中文摘要 I
英文摘要 II
目录 III
1. 绪论 1
 1.1  引言 1
 1.2  接枝改性方法 2
 1.2.1   化学方法 2
      1.2.2   光引发接枝 2
 1.2.3   辐射诱导接枝 2
 1.2.4   等离子态接枝 2
 1.2.5   化学动力接枝 2
 1.2.6   阴离子机理 3
 1.2.7   阳离子机理 3
 1.2.8   配位聚合接枝机理 3
 1.2.9   偶联反应接枝机理 3
 1.2.10  其他接枝方法 3
 1.3  接枝物的表征和结晶动力学研究 4
 1.3.1   表征 4
 1.3.2   结晶动力学研究 4
 1.4  论文的研究意义 5
2. 实验部分 7
 2.1  原料与仪器 7
 2.1.1  原料 7
 2.1.2  仪器设备 7
 2.2  实验方法 7
 2.2.1  接枝物的制备 7
 2.2.2  接枝率计算 7
 2.2.3  红外光谱分析 8
 2.2.4  偏光显微镜分析 8
 2.2.5  DSC分析 8
 2.2.5.1  等温结晶 8
 2.2.5.2  非等温结晶 8
3. 结果与讨论 9
 3.1  接枝物的表征  9
 3.1.1  红外分析 9
 3.1.2  偏光显微镜的分析 10
 3.2  DSC分析 11
 3.2.1  等温结晶动力学 11
 3.2.2  非等温结晶动力学 16
4．总结与展望 22
致谢 23
参考文献 24

摘 要：本论文用自由基引发制备了聚乙烯接枝马来酸酐共聚物（LDPE-g-MAH），用红外和偏光显微镜对接枝前后的聚乙烯进行表征。用DSC对LDPE和LDPE-g-MAH共聚物进行等温结晶和非等温结晶动力学的研究。等温结晶设定的结晶温度分别为92,93,94,95℃，用Avrami方程研究LDPE和接枝物LDPE-g-MAH的等温结晶动力学，得到等温结晶参数n和K(T),结果发现低密度聚乙烯(LDPE)和共聚物LDPE-g-MAH的等温结晶动力学受指定结晶温度的影响，且结晶较为复杂。非等温结晶的降温速率分别设置为5,10，20,30℃/min, 用Ozawa方程，Ozawa和Avrami组合方程研究LDPE和接枝物LDPE-g-MAH材料的非等温结晶动力学，得到非等温结晶动力学参数，结果发现Ozawa方程不适合这个体系，而利用Ozawa和Avrami组合方程能很好的描述。

关键词：低密度聚乙烯；马来酸酐；接枝共聚物；结晶动力学
 

Abstract: In this paper, the graft copolymer LDPE-g-MAH was prepared with LDPE, monomers of malefic anhydride via free radical polymerization. The copolymer was characterized by IR. Then the crystal morphology of copolymer was investigated by polarizing microscope. The differential scanning calorimetry researching was used to study the isothermal and non-isothermal crystallization of LDPE-g-MAH and LDPE. Isothermal crystallization tests were performed at 92℃, 93℃, 94℃, and 95℃. The Avrami equation was used to investigate the isothermal crystallization.,then obtained the isothermal crystallization parameters. In this test, it was found that the effect of crystallization temperature on the isothermal crystallization kinetics is obviously. For non-isothermal crystallizations, crystallizations were performed at cooling rates 5, 10, 15, and 30 ℃/min respectively. In the case of non-isothermal crystallization, it was found that the Ozawa analysis was rather inapplicable for the graft copolymer LDPE-g-MAH and LDPE. In contrast, the modified Avrami method, as well as the method proposed by Mo was applied giving satisfactory results.
Keywords：PE;MAH; Copolymer; Crystallization kinetics;