Citation: Yi Zou, Chen-guang Liu, Ai-hua He. Isothermal Crystallizations of Polybutene-1 and Polybutene-1 Alloy from Their Solutions[J]. Acta Polymerica Sinica, ;2018, 0(6): 765-772. doi: 10.11777/j.issn1000-3304.2017.17322 shu

Isothermal Crystallizations of Polybutene-1 and Polybutene-1 Alloy from Their Solutions

Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization, Key Laboratory of Rubber-Plastics (Ministry of Education), Qingdao University of Science and Technology, Qingdao 266042

Corresponding author: Chen-guang Liu, liuchenguang@qust.edu.cn Ai-hua He, aihuahe@iccas.ac.cn
Received Date: 27 November 2017
Revised Date: 25 January 2018
Available Online: 1 March 2018

It is known that the solubility of PB-1 in n-heptane correlates closly to temperature, so it is thus of vital importance to investigate the solution crystallization of polybutene-1 (PB-1) and polybutene-1 in-reactor alloy (PBA) via the cooling solution crystallization method. In this work, the isothermal solution crystallization behaviors of PB-1 and PB-1 in-reactor alloy (PBA) from n-heptane were investigated. The dissolution temperature and isothermal crystallization temperature were determined from the solubility curves of PB-1 in n-heptane obtained by grametry. The isothermal crystallization kinetics of PB-1 and PBA from solutions were studied by dilatometry. The solution crystallization rate decreased with increasing isothermal temperature without changing the nucleation mode of PB-1. However, the crystallization rate of PB-1 component in PBA was faster than that of pure PB-1. The presence of polypropylene (PP) component in PBA shortened nucleation induction period of PB-1 component, and PB-b-PP copolymer could accelerate crystallization rate of PB-1 component. Additionally, the DSC test confirmed that the crystal form I′ and III of PB-1 were generated during the solution crystallization in both pure PB-1 and PBA, and no crystal form transformation occurred at room temperature. Due to the solvation of n-heptane, the two crystal forms I and II of PB-1 were not observed in this system. From WAXD measurement, it has also been found that the increase in solution crystallization temperature promoted the relative content of the crystal form III with a decrease in the crystallinity of PB-1. This was because that the increase in temperature led to decrease in supersaturation of solution system, which weakened the driving force of the crystallization and decreased the crystallizable component of PB-1. The behavior change of PB-1 component in PBA with temperature was similar to that of pure PB-1. At the same temperature, the presence of PP component in PBA promoted the III/I′ ratio and the crystallinity of PB-1. We further proposed the crystallization models for PB-1 and PBA in solutions.
- Polybutene-1,
- Polybutene-1 alloy,
- Solubility,
- Solution crystallization,
- Isothermal crystallization kinetics
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