Citation: Ying Lu, Ying-ying Sun, Ran Chen, Xiu-hong Li, Yong-feng Men. Deformation Temperature and Lamellar Thickness Dependency of Form Ⅰ to Form Ⅲ Phase Transition in Syndiotactic Polypropylene during Tensile Stretching[J]. Chinese Journal of Polymer Science, ;2014, 32(9): 1210-1217. doi: 10.1007/s10118-014-1494-x shu

Deformation Temperature and Lamellar Thickness Dependency of Form Ⅰ to Form Ⅲ Phase Transition in Syndiotactic Polypropylene during Tensile Stretching

1.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Changchun 130022, China
2.
SSRF, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

Corresponding author: Yong-feng Men,
Received Date: 26 March 2014
Revised Date: 17 April 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 21134006).

Phase transition from form Ⅰ to form Ⅲ in syndiotactic polypropylene crystallized at different conditions during tensile deformation at different temperatures was investigated by using in situ synchrotron wide angle X-ray diffraction technique. In all cases, the occurrence of this phase transition was observed. The onset strain of this transition was found to be crystalline thickness decided by crystallization temperature and drawing temperature dependent. The effect of drawing temperature on this phase transition is understood by the changes in mechanical properties with temperature. Moreover, crystalline thickness dependency of the phase transition reveals that this form Ⅰ to from Ⅲ phase transition occurs first in those lamellae with their normal along the stretching direction which have not experienced stress induced melting and recrystallization.
- Tensile deformation,
- Phase transition,
- Syndiotactic polypropylene,
- WAXD
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沈阳化工大学材料科学与工程学院沈阳 110142