PP-g-St接枝共聚物的制备及结晶动力学研究

材料科学论文编号:CL064  论文字数:10343,页数:31

 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 聚丙烯接枝方法 1
 1.2.1 自由基接枝原理 2
                1.2.2 离子聚合接枝原理 3
                1.2.3 配位聚合接枝原理 4
      1.2.4 偶联反应接枝机理 4
      1.2.5 其他接枝方法 4
 1.3 结晶动力学研究方法 5
        1.3.1 结晶速度的测定方法 5
        1.3.2 Avrami方程 6
        1.3.3 结晶速度和温度的关系 6
 1.4 论文研究的意义 7
2. 实验部分 8
 2.1 原料和仪器 8
 2.1.1 单体和试剂  8
 2.1.2 实验仪器和设备 8
 2.2 实验步骤 8
     2.2.1 合成苯乙烯接枝聚丙烯共聚物 8
     2.2.2 接枝率的计算 8
 2.2.3 红外光谱分析 9
     2.2.4 偏光显微镜分析 9
     2.2.5 DSC分析 9
        3. 结果与讨论 10
 3.1 红外光谱分析    10
 3.2 偏光显微镜分析 11
    3.3 结晶动力学分析 12
 3.3.1等温结晶动力学分析 12
 3.3.2非等温结晶动力学分析 17
4．总结和展望 24
致谢 25
参考文献 26

摘 要：本实验以过氧化苯甲酰（BPO)为引发剂，用溶液接枝法合成了聚丙烯接枝苯乙烯的接枝共聚物（PP-g-St）。用红外光谱仪分析接枝产物，结果表明，St能接枝到PP大分子主链上；用偏光显微镜观察PP和PP-g-St两个样品的晶形，发现晶体形态为球晶，并且接枝后晶体变小。用DSC方法研究了PP和PP-g-St接枝共聚物的结晶动力学。等温结晶过程分别研究了128、130、132、134、136℃下的结晶行为，用Avrami方程分析PP和PP-g-St的等温结晶动力学；非等温结晶过程研究了降温速率分别为5、10、20、40℃/min下的结晶行为，采用Ozawa、Ozawa和Avrami组合方程、Takhor和Kissinger方程分析非等温结晶过程，处理PP和PP-g-St的数据发现Ozawa方程不适合PP和PP-g-St的非等温结晶过程，通过Takhor和Kissinger方程得到的活化能数值较接近。
关键词：聚丙烯；苯乙烯；接枝共聚物；结晶动力学；

Abstract: In this paper, the graft copolymer PP-g-St was prepared by polypropylene and styrene by solution polymerization with the initiator benzoyl peroxide (BPO). The copolymer was characterized by IR,it is showed that copolymer posses more a styrene
group of peaks compared with PP.The crystallization morphology of the PP and PP-g-St two samples was measured by polarizing microscope, the results show that the size of crystal was decreased. The isothermal and non-isothermal kinetics of copolymer was researched by differential scanning calorimetry (DSC). In the isothermal process, the crystallization kinetics was investigated with different annealing temperature such as 128, 130,132,134 and 136℃. .In the non-isothermal process, the crystallization kinetics was investigated with different cooling rate such as 5, 10, 20, 40℃/min. respectively.
The DSC dates was discussed by Ozawa and Avrami combination Takhor equation, Kissinger and the isothermal crystallization process equation analysis, PP and PP-g-St data found Ozawa equation is not suitable for PP and PP-g-St of isothermal crystallization process, through the Takhor Kissinger and the activation energy equation numerical closer.

Keywords：Polypropylene, Styrene, Graft copolymer, Crystallization kinetics.