高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (8): 1528.

• 研究简报 • 上一篇    下一篇

链缠结对聚合物结晶行为的影响

范仲勇, 于瀛, 王一任, 卜海山   

  1. 复旦大学材料科学系, 上海 200433
  • 收稿日期:2002-09-30 出版日期:2003-08-24 发布日期:2003-08-24
  • 通讯作者: 范仲勇(1962年出生),男,博士,副教授,主要从事聚合物结晶研究.E-mail:zyfan@fudan.edu.cn E-mail:zyfan@fudan.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20074008和90103037);国家重点基础研究专项经费(批准号:95-预-12和G1999064800)资助

Influence of Intermolecular Entanglements on CrystallizationBehavior of Macromolecules

FAN Zhong-Yong, YU Ying, WANG Yi-Ren, BU Hai-Shan   

  1. Department of Materials Science, Fudan University, Shanghai 200433, China
  • Received:2002-09-30 Online:2003-08-24 Published:2003-08-24

关键词: 缠结, 结晶, 超高分子量聚乙烯

Abstract: Ultra-high molar mass polyethylene(UHPE) or HDPEwas melted at various temperatures or at a constant temperature for various time, and then crystallization from the melt was investigated.The crystallization behavior of UHPE was found to be different from those of HDPE.It was found that the crystallization temperature decreased as the heating time or heating temperature increased.During the melting process, thermal motion of the chains leads to a change of chain conformation from parallel-extended chains to interpenetrated random coils, accompanied by the occurrence of entanglements.As a result, the crystallization temperature shifts to a lower temperature.In addition, the samples of UHPE with less entanglement were prepared by a freeze-drying procedure from dilute solution was proved the effect of entanglements on crystallization behavior of macromolecules.Apreliminary study on the crystallization of the samples indicates that entanglements have a pronounced effect on the crystallization behavior of macromolecules.

Key words: Entanglement, Crystallization, Ultra-high molar mass polyethylene

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