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Citation: LIN Ya-Kai, CHEN Gang, YANG Jian, WANG Xiao-Lin. The Crystallization Behavior of Isotactic Polypropylene in Mixed Diluents[J]. Chinese Journal of Applied Chemistry, ;2007, 24(9): 982-985. shu

The Crystallization Behavior of Isotactic Polypropylene in Mixed Diluents

1.
Department of Chemical Engineering, Tsinghua University, Beijing 100084

Corresponding author: WANG Xiao-Lin,
Received Date: 11 October 2006
Available Online: 25 January 2007
Fund Project: 国家"九七三"计划(2003CB615701) (2003CB615701)北京市教委重点项目(CXY100030402) (CXY100030402)北京市科委重点项目(D0406003040191) (D0406003040191)

The non-isothermal crystallization behavior of isotactic polypropylene(iPP) in mixed diluents was investigated by polarizing microscopy, and the structure of iPP microporous materials prepared via thermally induced phase separation was studied by scanning electron microscopy(SEM). The mixtures of DBP and soybean oil were used as the diluents, and the mass fraction of iPP in the solution was fixed at 30%. Both the growth rate of iPP spherulite and the structure of iPP microporous materials are significantly influenced by the composition of mixed diluents, which result from the changes of the viscosity of the system and the compatibility between iPP and diluents. At a cooling rate of 2 K/min, the radius and growth rate of iPP spherulites both increase exponentially with time. The growth rate of iPP spherulites decreases with the increase of the mass fraction of DBP in mixed diluents. When the mass fraction of DBP in mixed diluents increases from 0 to 60%, the growth rate.of iPP spherulites decreases from 41.9 μm/min to 10.3 μm/min. Cellular structure is obtained at the cooling rate of 2 K/min, while the pore size increases significantly with the decrease of soybean oil in the mixed diluents.
- isotactic polypropylene,
- mixed diluents,
- non-isothermal,
- crystallization
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