典型文献
Memory Effect of Crystallization in 1-Butene/α-olefin Copolymers
文献摘要：
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.
文献关键词：
中图分类号：
作者姓名：
Chun-Jing Qv;Wei Li;Rui-Jun Zhao;Zhe Ma
作者机构：
Tianjin Key Laboratory of Composite and Functional Materials,and School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China
文献出处：
引用格式：
[1]Chun-Jing Qv;Wei Li;Rui-Jun Zhao;Zhe Ma-.Memory Effect of Crystallization in 1-Butene/α-olefin Copolymers)[J].高分子科学（英文版）,2022(06):576-583
A类：
decene,tetradecene
B类：
Memory,Effect,Crystallization,Butene,olefin,Copolymers,macromolecular,architecture,crucial,determining,arrangement,ordering,structures,which,because,multiscale,feature,may,exhibit,distinct,melting,behaviors,induce,called,memory,effect,affect,following,recrystallization,Until,present,correlation,between,occurrence,intrinsic,still,far,from,comprehensive,understanding,In,this,work,four,kinds,butene,random,copolymers,were,designed,synthesized,using,pyridyl,amino,hafnium,catalyst,introduce,different,branches,length,was,precisely,controlled,by,specific,comonomers,include,hexene,octadecene,while,density,tuned,incorporation,expected,units,backbone,decreases,isothermal,kinetics,degree,crystallinity,More,interestingly,resulting,linear,can,threshold,concentration,increasing,Based,results,these,designable,direct,fraction,amorphous,region,established,quantitatively,indicates,local,segregation,crystallized,sequences
AB值：
0.573518
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