CRYSTALLIZATION BEHAVIOR OF POLYPROPYLENE IN PP/LMPM COMPOSITES

熊传溪; 闻荻江

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CRYSTALLIZATION BEHAVIOR OF POLYPROPYLENE IN PP/LMPM COMPOSITES

更新时间：2025-12-16

- CRYSTALLIZATION BEHAVIOR OF POLYPROPYLENE IN PP/LMPM COMPOSITES
- CIESC Journal Issue 2, (1999)
- 作者机构：
  
  武汉工业大学材料科学与工程学院,苏州大学化学化工学院武汉 430070,苏州,215006
- 作者简介：
- 基金信息：
- DOI：
  CLC： Q325
- Online First：25 April 1999，
  
  Published：25 April 1999
- 稿件说明：
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熊传溪, 闻荻江. CRYSTALLIZATION BEHAVIOR OF POLYPROPYLENE IN PP/LMPM COMPOSITES[J]. CIESC Journal, 1999, (2).
DOI：

熊传溪, 闻荻江. CRYSTALLIZATION BEHAVIOR OF POLYPROPYLENE IN PP/LMPM COMPOSITES[J]. CIESC Journal, 1999, (2). DOI：

摘要

引言等规聚丙烯(PP)耐热性较好

可以在100℃下长期使用

但低温脆性是其缺点之一.PP的脆性与其晶态结构密切相关

通过改变PP的形态结构可达到增韧PP的目的.低熔点金属(LMPM)具有优良的导电性

与聚合物如聚丙烯(PP)相比刚性也较大

采用适当的混炼工艺将LMPM与PP复合

可能会产生如下几个方面的效果:一是由于Sn的熔点(231.97℃)较低

在熔点以上混炼时因受到剪切力的作用会在聚合物基体中原位分散成纳米粒子;二是Sn纳米粒子不仅对PP可能有增韧的作用

而且可能会形成更多的导电通道

增加复合材料的导电性

降低渗流阈值;三是sn熔体的粘度比PP熔体的粘度低

可以改善PP的加工性能.在LMPM与即的原位复合过程中

PP的结晶行为有可能改变

以致造成复合材料的物理机械性能发生显著变化.本文采用DSC方法测定了PP/LMPM复合材料试样的等温结晶曲线

计算出了结晶速率常数k及Avrami常数n

探讨了PP的成核机理及生长机理.同时

测定了该试样的非等温结晶曲线

讨论了PP的结晶速率(成核速率、生长速率)和晶粒分布。

Abstract

The kinetics of nonisothermal and isothermal crystallization of polypropylene melt in polypropylene/low melting point metal( PP/LMPM) composites was investigated by DSC. LMPM is shown to be the nucleating agent of PP crystallization

and DBTL can increase the speed of PP crystallization. The higher the rotation speed in mixing process

the more the crystal nuclei. The crystallite dimension of PP decreases with the increase of volume fraction of LMPM

the increase of rotation speed in mixing process and the increase of volume fraction of DBTL. But homogeneous nuclei in PP/LMPM composites always exist and decrease to a limiting value with the increase of LMPM and DBTL.

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