中华医学超声杂志

应用化学 ›› 1992, Vol. 0 ›› Issue (6): 26-30.

• 研究论文 • 上一篇    下一篇

稀土氧化物对聚丙烯等温结晶动力学的影响

刘景江, 唐功本, 曲桂杰, 周华荣, 郭其鹏   

  1. 中国科学院长春应用化学研究所, 长春 130022
  • 收稿日期:1991-10-22 修回日期:1992-08-19 出版日期:1992-12-10 发布日期:1992-12-10
  • 基金资助:
    中国科学院长春应用化学研究所稀土化学与物理开放实验室

EFFECT OF RARE EARTH OXIDES ON THE CRYSTALLIZATION KINETICS OF ISOTACTIC POLYPROPYLENE

Liu Jingjiang, Tang Gongben, Qu Guijie, Zhou Huarong, Guo Qipeng   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022
  • Received:1991-10-22 Revised:1992-08-19 Published:1992-12-10 Online:1992-12-10

PDF

515

被引次数

17 | 4

摘要： 本文用差示扫描量热法测定了3种稀土氧化物对聚丙烯等温结晶行为的影响。结果表明,Avrami方程指数n、成核机理、晶体生长方式以及结晶晶型基本上不受稀土氧化物的影响。少量稀土氧化物可使结晶晶格垂直于分子链方向单位面积的界面自由能降低,结晶速率加大,其中Y2O3的效果最为显著,La2O3效果最低,混合稀土的作用效果与Y2O3相似。填加1 wt%的Y2O3可使聚丙烯的结晶速度常数增大一个数量级。

关键词: 聚丙烯, 稀土氧化物, 等温结晶动力学, 差示扫描量热法

Abstract: The effect of three rare earth oxides, La2O3, Y2O3, and a mixture of rare earth oxides on the crystallization behavior of isotactic polypropylene (iPP) has been studied via differential scanning calorimetry (DSC). Avrami exponents n, the mechanism of nucleation, spherulite growth style and the crystal form of iPP have not been influenced badly by the rare earth oxides during the isothermal crystallization. However, a little of rare earth oxides will increase the crystallization rate and decrease the fold surface free energy, Oe, remarkable. This effect for Y2O3 most obvious and lowest for La2O3. The effect of the mixture of rare earth oxides is similar to the effect of Y2O3. By adding 1 wt% Y2O3 into iPP, the overall rate constant k in Avrami equation increases in one order.

Key words: polypropylene, rare earth oxide, isothermal crystallization kinetics, differential scanning calorimetry (DSC)

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