

FOLLOWUS
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
niehuar@qust.edu.cn (H.R.N.)
ahhe@qust.edu.cn, aihuahe@iccas.ac.cn (A.H.H.)
Received:16 May 2019,
Revised:2019-6-28,
Accepted:19 July 2019,
Online First:06 October 2019,
Published:2020-02
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Ma, Y. P.; Zheng, W. P.; Liu, C. G.; Shao, H. F.; Nie, H. R.; He, A. H. Differential polymorphic transformation behavior of polybutene-1 with multiple isotactic sequences. Chinese J. Polym. Sci. 2020, 38, 164–173.
Ya-Ping Ma, Wei-Ping Zheng, Chen-Guang Liu, et al. Differential Polymorphic Transformation Behavior of Polybutene-1 with Multiple Isotactic Sequences[J]. Chinese Journal of Polymer Science, 2020, 38(2): 164-173.
Ma, Y. P.; Zheng, W. P.; Liu, C. G.; Shao, H. F.; Nie, H. R.; He, A. H. Differential polymorphic transformation behavior of polybutene-1 with multiple isotactic sequences. Chinese J. Polym. Sci. 2020, 38, 164–173. DOI: 10.1007/s10118-020-2337-6.
Ya-Ping Ma, Wei-Ping Zheng, Chen-Guang Liu, et al. 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.
For the solid-solid transformation from form II to form I of isotactic polybutene-1 (
i
PB)
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
i
PB 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
i
PB 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
i
PB form I.
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