Citation: Yu-Jie Wang, Su-Ying Yan, Zhi-Ping Zhao, Zhen-Yu Xi. Isothermal Crystallization of iPP in Environment-friendly Diluents: Effect of Binary Diluents and Crystallization Temperature on Crystallization Kinetics[J]. Chinese Journal of Polymer Science, ;2019, 37(6): 617-626. doi: 10.1007/s10118-019-2219-y shu

Isothermal Crystallization of iPP in Environment-friendly Diluents: Effect of Binary Diluents and Crystallization Temperature on Crystallization Kinetics

a.
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102488, China
b.
Environmental Protection Research Institute, Beijing Research Institute of Chemical Industry, SINOPEC, Beijing 100013, China

Corresponding author: Zhi-Ping Zhao, zhaozp@bit.edu.cn
Received Date: 23 October 2018
Revised Date: 13 December 2018
Available Online: 15 February 2019

The growing demand for non-toxic solvents for membrane preparation has motivated the studies for green and sustainable alternatives of solvents. The effect of droplet isothermal growth within the liquid-liquid phase separation region on isothermal spherulitic growth rate of isotactic polypropylene (iPP) was investigated. The results showed that the droplets grew up at a rate of 0.0172 μm·s⁻¹. The larger droplets slowed down the isothermal spherulitic growth rate of iPP. Higher mass ratio of carnauba wax (Cwax)/soybean oil (SO) resulted in faster droplet growth due to weak interaction with polymers. The isothermal crystallization behaviors of iPP in environment-friendly binary diluents consisting of Cwax and SO mixture were further investigated experimentally using polarized optical microscopy. It was demonstrated that the isothermal spherulitic growth rate of iPP in diluents decreased nonlinearly with the increasing crystallization temperature. Compared with virgin iPP, isothermal spherulitic growth rate of iPP in SO diluent was significantly slowed down. The spherulitic growth was further retarded after the addition of Cwax in mixed diluents, resulting in a lower crystallization rate than that in SO. Moreover, the crystal form of iPP membranes was found to be α type through the characterization of small angle X-ray scattering and wide angle X-ray diffraction.
- Isotactic polypropylene,
- Carnauba wax,
- Isothermal crystallization kinetics,
- PP membrane
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