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Citation: Liu Jingjiang, Tang Gongben, Qu Guijie, Zhou Huarong, Guo Qipeng. EFFECT OF RARE EARTH OXIDES ON THE CRYSTALLIZATION KINETICS OF ISOTACTIC POLYPROPYLENE[J]. Chinese Journal of Applied Chemistry, ;1992, 9(6): 26-30. shu

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

1.
Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022

Corresponding author: Liu Jingjiang,
Received Date: 22 October 1991
Available Online: 19 August 1992
Fund Project:

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, σ_c, 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.
- polypropylene,
- rare earth oxide,
- isothermal crystallization kinetics,
- differential scanning calorimetry (DSC)
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