中华医学超声杂志

应用化学 ›› 1993, Vol. 0 ›› Issue (3): 20-23.

• 研究论文 • 上一篇    下一篇

稀土氧化物对聚丙烯晶型和动态力学性能的影响

刘景江, 唐功本, 周华荣   

  1. 中国科学院长春应用化学研究所 130022 长春
  • 收稿日期:1992-10-05 修回日期:1992-11-03 出版日期:1993-06-10 发布日期:1993-06-10

EFFECT OF RARE EARTH OXIDES ON THE CRYSTAL FORMS AND DYNAMIC MECHANICAL PROPERTIES OF POLYPROPYLENE

Liu Jingjiang, Tang Gongben, Zhou Huarong   

  1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun
  • Received:1992-10-05 Revised:1992-11-03 Published:1993-06-10 Online:1993-06-10

PDF

520

被引次数

27 | 6

摘要： 本文用DSC和粘弹谱仪研究了La2O3,Y2O3和混合稀土氧化物对全同聚丙烯(iPP)的结晶行为,熔融行为和动态力学性能的影响。结果表明不同的iPP/稀土氧化物复合材料中iPP的晶型不同,Y2O3和稀土氧化物是iPP的α和β晶成核剂,La2O3是α晶成核剂。含有β晶试样同只有α晶试样相比,在Tg真松弛区其tanδ值较低,贮能模量E从-50℃～+50℃较高,从+50℃～+145℃则E值较低。

关键词: 差示扫描量热法, 聚丙烯, 稀土氧化物, 动态力学性质, 晶型

Abstract: The effects of La2O3, Y2O3 and mixed rare earth oxides on the crystallization, melting behavior and the dynamic mechanical properties of isotactic polypropylene in its composites with oxides have been investigated by means of DSC and viscoelastometry. Y2O3 and the mixed rare earth oxides appeared to be an a and β-nucleator and La2O3 is an α-nucleator for iPP. The crystallinity degree increases in order of PP/Y2O3,PP/mixed rare earth oxides,PP/La2O3 and pure iPP. Tanδ values of the samples containning both α and β-phases are lower than that of the iPP and PP/La2O3 in the region near Tg relaxation. Dynamic storage modulus E in the PP/Y2O3 and PP/mixed rare earth oxides was higher than that of PP/La2O3 and iPP in the range of -50℃ to 50℃, but lower in 50℃ to 145℃.These results are attributable to the β-phase of polymer crystal in the samples.

Key words: differential scanning calorimetry, polypropylene, rare earth oxide, dynamic mechanical property, crystal phase

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