Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (6): 1252.

• Articles • Previous Articles     Next Articles

Microspheres Prepared from Ultrahigh Molecular Weight Polyethylene in Supercritical CO2 Fluid

WANG Chang-Ming1,2, ZHANG Xiu-Qin1, ZHAO Ying1, HAN Bu-Xing1, WANG Du-Jin1*   

  1. 1. Chinese Academy of Sciences Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2010-01-04 Online:2010-06-10 Published:2010-06-10
  • Contact: WANG Du-Jin. E-mail: djwang@iccas.ac.cn
  • Supported by:

    国家杰出青年基金(批准号: 50925313)和国家“八六三”计划项目(批准号: 2007AA03Z554)资助.

Abstract:

The hollow microspheres were prepared from ultrahigh molecular weight polyethylene(UHMWPE) in supercritical CO2 fluid. The sphere size is Gaussian distribution, and can be controlled at a narrow range. There are pores on the surface of hollow microspheres due to the CO2 gas releasing from confined location in the microsphere with decreasing the temperature of supercritical fluid. The crystallinity increases and monoclinic crystals can be generated for prepared UHMWPE microspheres in supercritical CO2 fluid. The isothermal crystallization process can increase both the crystallinity and the content of orthorhombic crystals of UHMWPE.

Key words: Ultrahigh molecular weight polyethylene; Hollow microsphere; Supercritical fluid; CO2; Crystallization

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