高等学校化学学报

高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (8): 1671.

• 研究论文 • 上一篇    下一篇

过冷等规聚丙烯熔体的流变学行为

刘毓海1,3, 李慧珍2,4, 刘溪2,5, 胡丽萍5, 杨展澜2, 徐怡庄2, 吴瑾光2   

  1. 1. 中国科学院化学研究所, 北京分子科学国家实验室, 工程塑料院重点实验室, 北京 100190;
    2. 北京大学化学与分子工程学院, 北京分子科学国家实验室, 稀土材料化学及应用国家重点实验室, 北京 100871;
    3. 中国科学院研究生院, 北京 100049; 4. 河南师范大学化学与环境科学学院, 新乡 453007;
    5. 辽宁中医药大学药学院, 沈阳 110032
  • 收稿日期:2010-01-29 出版日期:2010-08-10 发布日期:2010-08-10
  • 通讯作者: 徐怡庄, 男, 博士, 副教授, 主要从事分子光谱的研究. E-mail: xyz@pku.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 50673005, 50973003)和北京大学先进技术研究院培育项目资助.

Rheological Behavior of Isotactic Polypropylene(iPP) Melts in Supercooling State

LIU Yu-Hai1,3, LI Hui-Zhen2,4, LIU Xi2,5, HU Li-Ping5, YANG Zhan-Lan2, XU Yi-Zhuang2*, WU Jin-Guang2   

  1. 1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
    2. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;
    3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
    4. College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007, China;
    5. School of Pharmaceutical Sciences, Liaoning University of Traditional Chinese Medicine 110032, China
  • Received:2010-01-29 Online:2010-08-10 Published:2010-08-10
  • Contact: XU Yi-Zhuang. E-mail: xyz@pku.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 50673005, 50973003)和北京大学先进技术研究院培育项目资助.

PDF (PC)

被引次数

1

摘要： 采用毛细管流变仪研究低于表观熔点的过冷聚丙烯熔体的流变学行为. 过冷聚丙烯熔体先经过一段诱导期后, 熔体发生凝胶化, 剪切黏度在短时间内大幅度升高, 最终固化结晶. 在诱导期中, 过冷聚丙烯熔体的流变行为与高于聚丙烯熔点的常规熔体的流变行为相仿. 诱导期的长度与温度有关. 在160 ℃下, 诱导期的长度足够长, 于是使用过冷聚丙烯熔体进行纺丝加工成为可能. 实验结果表明, 由过冷熔体制备的初生纤维各项性能与由高温熔体制备的初生纤维亦相似, 因此, 通过降低喷丝头温度的方法发展一种节能降耗的聚丙烯纤维制造技术有潜在的可能性.

关键词: 等规聚丙烯, 过冷, 熔融纺丝, 流变学行为

Abstract: Decreasing the processing temperature can prevent thermal degradation of polymeric material and reduce energy consumption in the manufacturing process. In this paper, capillary rheometer was used to investigate the rheological behavior of isotactic polypropylene(iPP) in supercooling states. Experimental results demonstrate that the iPP melt in supercooling state have an induction period. After the induction period, the iPP melt undergoes gelation that is manifested by rapid increasing of the shear viscosity and leads to solidification and crystallization of iPP. During the induction period, the rheological behavior of iPP melt in supercooling states are similar to the conventional iPP melt whose temperature is above the melting temperature of iPP. The length of the induction period depends on the temperature of the melt. At 160 ℃, the length of the induction period is long enough so that it is possible to produce iPP fibers by spinning supercooling melt. In the suitable process conditions, the mechanical performance, FTIR spectra and XRD patterns of the iPP fibers produced from supercooling iPP melt are similar to those of the iPP fibers prepared from high temperature iPP melt. Thus, this work suggests that it is possible to develop an energy-saving technique to manufacturing of iPP fibers.

Key words: Isotactic polypropylene(iPP), Supercooling, Melt spinning, Rheological behavior

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