

FOLLOWUS
Tianjin Key Laboratory of Composite and Functional Materials, and School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
zhe.ma@tju.edu.cn
Received:27 September 2021,
Revised:2021-10-18,
Accepted:01 November 2021,
Online First:11 January 2022,
Published:01 June 2022
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Qv, C. J.; Li, W.; Zhao, R. J.; Ma, Z. Memory effect of crystallization in 1-butene/α-olefin copolymers. Chinese J. Polym. Sci. 2022, 40, 576–583
Chun-Jing Qv, Wei Li, Rui-Jun Zhao, et al. Memory Effect of Crystallization in 1-Butene/
Qv, C. J.; Li, W.; Zhao, R. J.; Ma, Z. Memory effect of crystallization in 1-butene/α-olefin copolymers. Chinese J. Polym. Sci. 2022, 40, 576–583 DOI: 10.1007/s10118-022-2660-1.
Chun-Jing Qv, Wei Li, Rui-Jun Zhao, et al. Memory Effect of Crystallization in 1-Butene/
This work studied the quantitative relation between the crystallization memory effect and the macromolecular architecture using four kinds of 1-butene/α-olefin random copolymers with various branch length and density. The occurrence of memory effect can be enhanced by increasing the branch length and density
which exhibits a direct correlation with crystallinity.
The macromolecular architecture is the crucial factor in determining the arrangement of the ordering structures
which
because of the multiscale feature
may exhibit distinct melting behaviors and induce the so-called memory effect to affect the following recrystallization. Until present
the correlation between the occurrence of memory effect and the intrinsic molecular structure is still far from the comprehensive understanding. In this work
four kinds of 1-butene/
α
-olefin random copolymers were designed and synthesized using the (pyridyl-amino) hafnium catalyst to introduce the different branches. The branch length was precisely controlled by the specific
α
-olefin comonomers
which include 1-hexene
1-decene
1-tetradecene
and 1-octadecene
while the branch density was tuned by the incorporation. As expected
the incorporation of
α
-olefin co-units to poly(1-butene) backbone decreases the non-isothermal crystallization kinetics and the degree of crystallinity. More interestingly
the resulting linear branch can induce the occurrence of memory effect and the threshold concentration of co-units (
i.e.
branch density) decreases with increasing the branch length. Based on the results of these 1-butene/
α
-olefin copolymers with designable branches
a direct correlation with the occurrence of memory effect and the fraction of amorphous region was established
which quantitatively indicates the degree of local segregation of the crystallized poly(1-butene) sequences by the
α
-olefin co-units.
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