ICCAS OpenIR
Polydispersity of ethylene sequence length in metallocene ethylene/alpha-olefin copolymers. I. Characterized by thermal-fractionation technique
Zhang, FJ; Liu, JP; Fu, Q; Huang, HY; Hu, ZJ; Yao, S; Cai, XY; He, TB
2002-05-01
Source PublicationJOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
ISSN0887-6266
Volume40Issue:9Pages:813-821
AbstractIn this article, the polydispersity of the ethylene sequence length (ESL) in ethylene/alpha-olefin copolymers was studied by atomic force microscopy (AFM) and the thermal-fractionation technique. The crystal morphology observation by AFM showed that morphology changed gradually with decreasing average ESL from complete lamellae over shorter and more curved lamellae to a granular-like morphology, and the mixed morphology was observed after stepwise crystallization from phase-separated melt. This result indicated that the ethylene sequence with different lengths crystallized into a crystalline phase with a different size and stability at the copolymer systems. The thermal-fractionation technique was used to characterize the polydispersity of ESL. Three of the following statistical terms were introduced to describe the distribution of ESL and the lamellar thickness: the arithmetic mean (L) over bar (n), the weight mean (L) over bar (w), and the broadness index I = (L) over bar (w)/(L) over bar (n). It was concluded that the polydispersity of ESL could be quantitatively characterized by the thermal-fractionation technique. The effects of temperature range, temperature-dependent specific heat capacity C-p of copolymer, and the molecular weight on the results of thermal fractionation were discussed, (C) 2002 Wiley Periodicals, Inc.
KeywordPolyethylene (Pe) Dsc Crystallization Fractionation Of Polymers
DOI10.1002/polb.10145
Indexed BySCI
Language英语
WOS IDWOS:000175181500005
PublisherJOHN WILEY & SONS INC
Citation statistics
Cited Times:25[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/79110
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,Fu, Q,et al. Polydispersity of ethylene sequence length in metallocene ethylene/alpha-olefin copolymers. I. Characterized by thermal-fractionation technique[J]. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,2002,40(9):813-821.
APA Zhang, FJ.,Liu, JP.,Fu, Q.,Huang, HY.,Hu, ZJ.,...&He, TB.(2002).Polydispersity of ethylene sequence length in metallocene ethylene/alpha-olefin copolymers. I. Characterized by thermal-fractionation technique.JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,40(9),813-821.
MLA Zhang, FJ,et al."Polydispersity of ethylene sequence length in metallocene ethylene/alpha-olefin copolymers. I. Characterized by thermal-fractionation technique".JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 40.9(2002):813-821.
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