Citation: Ya-Ping Ma, Wei-Ping Zheng, Chen-Guang Liu, Hua-Feng Shao, Hua-Rong Nie, Ai-Hua He. Differential Polymorphic Transformation Behavior of Polybutene-1 with Multiple Isotactic Sequences[J]. Chinese Journal of Polymer Science, ;2020, 38(2): 164-173. doi: 10.1007/s10118-020-2337-6 shu

Differential Polymorphic Transformation Behavior of Polybutene-1 with Multiple Isotactic Sequences

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, China

Corresponding author: Hua-Rong Nie, niehuar@qust.edu.cn Ai-Hua He, ahhe@qust.edu.cn;aihuahe@iccas.ac.cn
Received Date: 16 May 2019
Revised Date: 28 June 2019
Available Online: 6 October 2019

For the solid-solid transformation from form II to form I of isotactic polybutene-1 (iPB), the temperature dependence of form I nucleation and growth was deemed to control the transformation process. However, the relationship between form I formation and form II disappearance in the transformation process is not clear. In this work, the spontaneous crystal transformation from form II to I of iPB with 81 mol% mmmm sequence concentration is studied firstly by tracking the two processes, the decay of form II and the yielding of form I in a wide range of temperature spanning from 0 °C to 50 °C and in a long transformation time ranging from 5 min to 65 days with in situ FTIR and WAXD. Unlike the literature reports, the decay rate of form II is firstly found to be lower than the yielding rate of form I at all studied temperatures, especially at low transition temperature. This is attributed to the amorphous chains which locate near crystal lamella participating into the nucleation of form II. The regular chain folding and growth of iPB form I from amorphous chains containing short isotactic sequences also lead to an increase in crystallinity of form I compared with that of initial form II crystallized at 60 °C. An increase in the annealing temperature results in decrease in crystallinity and increase in lamellae thickness of iPB form I.
- Polybutene-1,
- Polymorphic transformation,
- Isotactic sequence,
- Crystallinity,
- Lamellae thickness
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