中国塑料 ›› 2011, Vol. 25 ›› Issue (12): 35-38 .DOI: 10.19491/j.issn.1001-9278.2011.12.009

• 材料与性能 • 上一篇    下一篇

高密度聚乙烯的过氧化物交联行为及结晶行为研究

谭志勇 阙盼 李丹 刘庆辉   

  1. 长春工业大学化学工程学院合成树脂与特种纤维教育部工程研究中心 长春工业大学化学工程学院 长春工业大学化学工程学院
  • 收稿日期:2011-07-29 修回日期:1900-01-01 出版日期:2011-12-26 发布日期:2011-12-26

Study on Cross-linking Behavior and Crystallization Behavior of Dicumyl Peroxide Crosslinked High-density Polyethylene

  

  • Received:2011-07-29 Revised:1900-01-01 Online:2011-12-26 Published:2011-12-26

摘要: 采用过氧化物交联法分析了高密度聚乙烯(PE-HD)的交联行为,研究了过氧化二异丙苯(DCP)含量对PE-HD凝胶含量的影响,确定了最佳交联条件;采用差示扫描量热法和广角X射线衍射等测试技术研究了不同DCP含量对PE-HD结晶行为的影响。结果表明,随着DCP用量的增加,PE-HD的凝胶含量逐渐增加,当DCP用量高于1.5 %(质量分数,下同)时,凝胶含量增加缓慢,用量达到3.0 %时,凝胶含量可以达到73.9 %;当交联温度为170 ℃、交联时间为30 min时,DCP可完全分解,交联反应充分;随着DCP含量的增加,PE-HD的熔融温度、结晶温度及结晶度均呈下降趋势,晶粒尺寸变小,晶型未发生改变。

关键词: 高密度聚乙烯, 过氧化二异丙苯, 凝胶含量, 结晶行为, 交联

Abstract: In this paper, the effect of dicumyl peroxide (DCP) content on crosslinking behavior of high density polyethylene (PE-HD) was investigated. The gel fraction of PE-HD increased with increasing DCP content and reached 73.9% with a DCP content of 3.0 %, a temperature of 170 ℃, and a reaction time of 30min. The effect of DCP content on crystallization behavior of PE-HD was studied using differential scanning calorimetry (DSC) and X-ray diffraction (XRD). It showed that with increasing DCP content, the melting point and crystallization temperature decreased, the crystallinity degree and grain size decreased, however, the crystal structure was not affected.

Key words: high density polyethylene, dicumyl peroxide, gel fraction, crystallization behavior, cross-linking

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