ICCAS OpenIR
Polydispersity of ethylene sequence length in metallocene ethylene/alpha-olefin copolymers. II. Influence on crystallization and melting behavior
Zhang, FJ; Liu, JP; Xie, FC; Fu, Q; He, TB
2002-05-01
Source PublicationJOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
ISSN0887-6266
Volume40Issue:9Pages:822-830
AbstractIn this work, crystallization and melting behavior of metallocene ethylene/alpha-olefin copolymers were investigated by differential scanning calorimetry (DSC) and atomic force microscopy (AFM). The results indicated that the crystallization and melting temperatures for all the samples were directly related to the long ethylene sequences instead of the average sequence length (ASL), whereas the crystallization enthalpy and crystallinity were directly related to ASL, that is, both parameters decreased with a decreasing ASL. Multiple melting peaks were analyzed by thermal analysis. Three phenomena contributed to the multiple melting behaviors after isothermal crystallization, that is, the melting of crystals formed during quenching, the melting-recrystallization process, and the coexistence of different crystal morphologies. Two types of crystal morphologies could coexist in samples having a high comonomer content after isothermal crystallization. They were the chain-folded lamellae formed by long ethylene sequences and the bundlelike crystals formed by short ethylene sequences. The coexistence phenomenon was further proved by the AFM morphological observation. (C) 2002 Wiley Periodicals, Inc.
KeywordPolyethylene (Pe) Differential Scanning Calorimetry (Dsc) Crystallization Melt
DOI10.1002/polb.10146
Indexed BySCI
Language英语
WOS IDWOS:000175181500006
PublisherJOHN WILEY & SONS INC
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/78384
Collection中国科学院化学研究所
Corresponding AuthorHe, TB
Affiliation1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Sichuan Univ, Dept Polymer Sci & Mat, Chengdu 610065, Peoples R China
Recommended Citation
GB/T 7714
Zhang, FJ,Liu, JP,Xie, FC,et al. Polydispersity of ethylene sequence length in metallocene ethylene/alpha-olefin copolymers. II. Influence on crystallization and melting behavior[J]. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,2002,40(9):822-830.
APA Zhang, FJ,Liu, JP,Xie, FC,Fu, Q,&He, TB.(2002).Polydispersity of ethylene sequence length in metallocene ethylene/alpha-olefin copolymers. II. Influence on crystallization and melting behavior.JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,40(9),822-830.
MLA Zhang, FJ,et al."Polydispersity of ethylene sequence length in metallocene ethylene/alpha-olefin copolymers. II. Influence on crystallization and melting behavior".JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 40.9(2002):822-830.
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