Mechanism of Polymorph Selection during Crystallization of Random Butene-1/Ethylene Copolymer

Starting from an initial sample of butene-1/ethylene copolymer with stable form I＇, we examined the nucleation of different crystalline polymorphs （here metastable form II and stable form I＇） at different isothermal crystallization temperatures after being melted at different melt temperature （Tmelt...

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Published inChinese journal of polymer science Vol. 34; no. 8; pp. 1014 - 1020
Main Authors Wang, Yao-tao, Liu, Pei-ru, Lu, Ying, Men, Yong-feng
Format Journal Article
LanguageEnglish
Published Beijing Chinese Chemical Society and Institute of Chemistry, CAS 01.08.2016
Subjects
1-丁烯
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Copolymers
Crystal structure
Crystallites
Crystallization
Ethylene
Industrial Chemistry/Chemical Engineering
Melting
Nucleation
Nuclei
Polymer Sciences
乙烯共聚物
多晶型
形态稳定
机制
结晶温度
选择过程
随机
Random copolymer
Polybutene-1
Crystallization
Polymorphism
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Summary:Starting from an initial sample of butene-1/ethylene copolymer with stable form I＇, we examined the nucleation of different crystalline polymorphs （here metastable form II and stable form I＇） at different isothermal crystallization temperatures after being melted at different melt temperature （Tmelt）. When Tmelt was just above the melting temperature （Tm） of the crystallites, self-seeding took place. There, residue crystallites served as nuclei leading to the crystallization of the same crystalline phase. When Tmelt was a few degrees above the Tin, self-seeding was disabled due to complete melting of the initial crystals. Upon crystallization, the selection of the different polymorphs in this random copolymer was found to depend on an interplay between the domain size of segregated long crystallizable sequences and the size and energy barrier of the critical nucleus of the respective crystalline forms. Our results provide a clear understanding of the polymorphs selection during crystallization of a random copolymer as well as homo-polymers under confinement.
Bibliography:Yao-tao Wang, Pei-ru Liu, Ying Lu and Yong-feng Men（ State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Changchun 130022, China）
Starting from an initial sample of butene-1/ethylene copolymer with stable form I＇, we examined the nucleation of different crystalline polymorphs （here metastable form II and stable form I＇） at different isothermal crystallization temperatures after being melted at different melt temperature （Tmelt）. When Tmelt was just above the melting temperature （Tm） of the crystallites, self-seeding took place. There, residue crystallites served as nuclei leading to the crystallization of the same crystalline phase. When Tmelt was a few degrees above the Tin, self-seeding was disabled due to complete melting of the initial crystals. Upon crystallization, the selection of the different polymorphs in this random copolymer was found to depend on an interplay between the domain size of segregated long crystallizable sequences and the size and energy barrier of the critical nucleus of the respective crystalline forms. Our results provide a clear understanding of the polymorphs selection during crystallization of a random copolymer as well as homo-polymers under confinement.
Crystallization; Random copolymer; Polybutene-1; Polymorphism.
11-2015/O6
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-016-1802-8