NONISOTHERMAL CRYSTALLIZATION KINETICS OF POLYPROPYLENE/MONTMORILLONITE NANOCOMPOSITE

XU Weibing; GE Mingliang; HE Pingsheng

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NONISOTHERMAL CRYSTALLIZATION KINETICS OF POLYPROPYLENE/MONTMORILLONITE NANOCOMPOSITE

Research Article | 更新时间：2021-03-19

- NONISOTHERMAL CRYSTALLIZATION KINETICS OF POLYPROPYLENE/MONTMORILLONITE NANOCOMPOSITE
- Acta Polymerica Sinica Issue 5, Pages: 584-588(2001)
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- Published：20 October 2001，
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XU Weibing, GE Mingliang, HE Pingsheng. NONISOTHERMAL CRYSTALLIZATION KINETICS OF POLYPROPYLENE/MONTMORILLONITE NANOCOMPOSITE. [J]. Acta Polymerica Sinica (5):584-588(2001)
DOI：

XU Weibing, GE Mingliang, HE Pingsheng. NONISOTHERMAL CRYSTALLIZATION KINETICS OF POLYPROPYLENE/MONTMORILLONITE NANOCOMPOSITE. [J]. Acta Polymerica Sinica (5):584-588(2001) DOI：

摘要

用熔融插层法制备聚丙烯

蒙脱土纳米复合材料

用DSC手段研究了其非等温结晶行为

并与聚丙烯进行了对比．对所得数据分别用修正Avrami方程的Jeziomy法、Ozawa法和Mo法进行处理．结果表明

用Jeziomy法和Mo法处理非等温结晶过程比较理想

而用OZawa法处理则不太适用．用Jeziomy法求出的参数Z

和n随冷却速率的增加而增加

但复合材料的Z。和n略大于聚丙烯的Z。和n

用Mo法求出的参数F(r)随结晶度的增加而略有增加

a几乎未变

复合材料的F(T)略小于聚丙烯的F(T)

复合材料的α约为1.40略大于聚丙烯的α(其值约为1.04)．按Kissinger方法计算出聚丙烯及聚丙烯

蒙脱土纳米复合材料的结晶活化能分别为189.37kJ／mol

155.69 kJ／mol

说明有机蒙脱土的加入

降低了聚丙烯的结晶活化能

起到了异相成核的作用．

Abstract

The nonisothermal crystallization kinetics of polypropylene (PP) and polypropylene／organicmontmorillonite (PP／Mont) nanocomposite

which was prepared by melt intercalation

was studied by means of differential scanning calorimetry (DSC)．The modified Avrami theories of Jeziorny

Ozawa and Mo were used to analyze the data of DSC．The result showed that both the Jeziorny and Mo methods could describe this system very well

but the Ozawa analysis failed．The values of Zc and n increased with increasing cooling rate

and the values of Zc and n of PP／Mont nanocomposite were higher than those of PP at the same cooling rate．The value of F(T) increased

and the value of a had no significant change with increasing degree of crystallinity for PP and PP／Mont nanocomposite

respectively. The values of F(T) of PP／Mont nanocomposite were lower than those of PP at the same degree of crystallinity．The value ofa was 1.04

1.40 or so for PP and PP／Mont nanocomposite

respectively．The activation energies have been evaluated by Kissinger method to be 189.37 kJ／mol and 155.69 kJ／mol for the nonisothermal crystallization of PP and PP／Mont nanocomposite

respectively．The addition of organic montmorillonite decreased the activation energy of crystallization of PP

which could be used as nucleating agent during nonisothermal crystallization process of PP．

关键词

聚丙烯蒙脱土纳米复合材料非等温结晶动力学

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Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology

1,2),GAO Xueqin~2,YUAN Yi~2,SHEN Kaizhi~2

四川大学高分子科学与工程学院高分子材料工程国家重点实验室

四川大学高分子科学与工程学院高分子材料工程国家重点实验室成都

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