PP-g-St接枝共聚物的制備及結晶動力學研究

材料科學論文編號:CL064  論文字數:10343,頁數:31

 目  錄
中文摘要 I
英文摘要 II
目錄 III
1. 緒論 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 離子聚合接枝原理 3
                1.2.3 配位聚合接枝原理 4
      1.2.4 偶聯反應接枝機理 4
      1.2.5 其他接枝方法 4
 1.3 結晶動力學研究方法 5
        1.3.1 結晶速度的測定方法 5
        1.3.2 Avrami方程 6
        1.3.3 結晶速度和溫度的關系 6
 1.4 論文研究的意義 7
2. 實驗部分 8
 2.1 原料和儀器 8
 2.1.1 單體和試劑  8
 2.1.2 實驗儀器和設備 8
 2.2 實驗步驟 8
     2.2.1 合成苯乙烯接枝聚丙烯共聚物 8
     2.2.2 接枝率的計算 8
 2.2.3 紅外光譜分析 9
     2.2.4 偏光顯微鏡分析 9
     2.2.5 DSC分析 9
        3. 結果與討論 10
 3.1 紅外光譜分析    10
 3.2 偏光顯微鏡分析 11
    3.3 結晶動力學分析 12
 3.3.1等溫結晶動力學分析 12
 3.3.2非等溫結晶動力學分析 17
4．總結和展望 24
致謝 25
參考文獻 26

摘 要：本實驗以過氧化苯甲酰（BPO)為引發劑，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）。用紅外光譜儀分析接枝產物，結果表明，St能接枝到PP大分子主鏈上；用偏光顯微鏡觀察PP和PP-g-St兩個樣品的晶形，發現晶體形態為球晶，并且接枝后晶體變小。用DSC方法研究了PP和PP-g-St接枝共聚物的結晶動力學。等溫結晶過程分別研究了128、130、132、134、136℃下的結晶行為，用Avrami方程分析PP和PP-g-St的等溫結晶動力學；非等溫結晶過程研究了降溫速率分別為5、10、20、40℃/min下的結晶行為，采用Ozawa、Ozawa和Avrami組合方程、Takhor和Kissinger方程分析非等溫結晶過程，處理PP和PP-g-St的數據發現Ozawa方程不適合PP和PP-g-St的非等溫結晶過程，通過Takhor和Kissinger方程得到的活化能數值較接近。
關鍵詞：聚丙烯；苯乙烯；接枝共聚物；結晶動力學；

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.