Citation: Ya-Hui Lou, Yi-Long Liao, Li Pan, Bin Wang, Yue-Sheng Li, Zhe Ma. Effect of Linear and Ring-like Co-units on the Temperature Dependence of Nucleation and Growth in II-I Phase Transition of Butene-1 Copolymers[J]. Chinese Journal of Polymer Science, ;2018, 36(11): 1269-1276. doi: 10.1007/s10118-018-2135-6 shu

Effect of Linear and Ring-like Co-units on the Temperature Dependence of Nucleation and Growth in II-I Phase Transition of Butene-1 Copolymers

Tianjin Key Laboratory of Composite and Functional Materials and School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China

Corresponding author: Zhe Ma, zhe.ma@tju.edu.cn
Received Date: 10 February 2018
Revised Date: 17 March 2018
Accepted Date: 19 March 2018
Available Online: 20 April 2018

The phase transition from tetragonal form II to hexagonal form I was studied for the butene-1/ethylene and butene-1/1,5-hexadiene random copolymers, which have comparable molecular weight but distinct linear ethylene and ringlike methylene-1,3-cyclopentane (MCP) structural co-units, respectively. It is known that this solid phase transition follows the nucleation-growth mechanism, so the stepwise annealing protocol was utilized to investigate the influences of co-units on the optimal nucleation and growth temperatures. Compared with optimal nucleation and growth temperatures of −10 and 35 °C, respectively, in polybutene-1 homopolymer, two butene-1/ethylene copolymers with 1.5 mol% and 4.3 mol% co-units have the slightly lower optimal nucleation temperature of −15 °C but much higher optimal growth temperature of 50 °C. Clearly, the effect of ethylene co-unit is more significant on varying optimal temperature for growth than for nucleation. Furthermore, when the incorporated co-unit is ringlike MCP, the optimal nucleation temperature is −15 °C for 2.15 mol% co-units, the same with above BE copolymers, but −13 °C for a very low concentration of 0.65 mol%. Interestingly, the optimal growth temperature of butene-1/1,5-hexadiene copolymers with 0.65 mol%−2.15 mol% MCP co-units increases to 55 °C, which is also independent on co-unit concentration. These obtained values of optimal temperatures provide crucial parameters for rapid II-I phase transition.
- Butene-1 copolymer,
- Co-unit type,
- Phase transformation,
- Nucleation,
- Crystal growth
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