Memory Effect of Crystallization in 1-Butene/<italic style="font-style: italic">α</italic>-olefin Copolymers

Chun-Jing Qv; Wei Li; Rui-Jun Zhao; Zhe Ma

doi:10.1007/s10118-022-2660-1

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Memory Effect of Crystallization in 1-Butene/α-olefin Copolymers

RESEARCH ARTICLE | Updated：2022-05-24

- Memory Effect of Crystallization in 1-Butene/α-olefin Copolymers
- Chinese Journal of Polymer Science Vol. 40, Issue 6, Pages: 576-583(2022)
- Affiliations：
  
  1.Tianjin Key Laboratory of Composite and Functional Materials, and School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
- Author bio：
  
  zhe.ma@tju.edu.cn
- Funds：
- DOI：10.1007/s10118-022-2660-1
  CLC：
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Chun-Jing Qv, Wei Li, Rui-Jun Zhao, et al. Memory Effect of Crystallization in 1-Butene/α-olefin Copolymers. [J]. Chinese Journal of Polymer Science 40(6):576-583(2022)
DOI：

Chun-Jing Qv, Wei Li, Rui-Jun Zhao, et al. Memory Effect of Crystallization in 1-Butene/α-olefin Copolymers. [J]. Chinese Journal of Polymer Science 40(6):576-583(2022) DOI： 10.1007/s10118-022-2660-1.

摘要

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.

Abstract

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.

关键词

Keywords

Memory effect1-Butene/α-olefin copolymer Linear branchCrystallinity

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Memory Effect of Crystallization in 1-Butene/α-olefin Copolymers

DOI：10.1007/s10118-022-2660-1

摘要

Abstract

关键词

Keywords

references