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Influence of Branching on the Thermal and Crystallization Behavior of Bimodal Polyethylenes Synthesized with Binary Late-Transition-Metal Catalyst Combinations
Long, Ying-Yun1,2; Liu, San-Rong1; Cui, Lei1; Li, Yue-Sheng1
2010-03-05
Source PublicationJOURNAL OF APPLIED POLYMER SCIENCE
ISSN0021-8995
Volume115Issue:5Pages:3045-3055
AbstractTwo reactor blends of linear and branched polyethylene resins with bimodal molecular weight distributions were synthesized in a one-reactor polymerization process through the combination of 2,6-bis[1-(2,6-dimethyphenylimino)pyridyl]cobalt dichloride (1) and 2,3-bis(2,6-diisopropylphenyl)butanediimine nickel dibromide (2) or 1,2-bis(2,6-diisopropylphenyl)cyclohexene diimine nickel dibromide (3) in the presence of modified methylaluminoxane. The linear correlation between the catalyst activity and concentration of the nickel compounds suggested that the catalysts performed independently of one another. The molecular weights, molecular weight distributions, and crystalline and phase structures of the blends were investigated with a combination of high-temperature get permeation chromatography, differential scanning calorimetry, wide-angle X-ray diffraction, and small-angle X-ray scattering techniques. The branching degree of the polyethylene produced with 3 was much higher than the branching degree of the sample produced with 2, although their molecular weights were relatively close. In addition, the crystallization rate, melting temperature, degree of crystallinity, and crystallization temperature of more highly branched blends produced with 1/3 were lower. The long periods and thickness of the crystalline region were greatly influenced by the addition of highly branched polyethylene. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 115: 3045-3055, 2010
KeywordBlends Crystallization Thermal Properties
DOI10.1002/app.31409
Indexed BySCI
Language英语
WOS IDWOS:000274114000064
PublisherJOHN WILEY & SONS INC
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/68984
Collection中国科学院化学研究所
Corresponding AuthorLi, Yue-Sheng
Affiliation1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Chinese Acad Sci, Grad Sch, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Long, Ying-Yun,Liu, San-Rong,Cui, Lei,et al. Influence of Branching on the Thermal and Crystallization Behavior of Bimodal Polyethylenes Synthesized with Binary Late-Transition-Metal Catalyst Combinations[J]. JOURNAL OF APPLIED POLYMER SCIENCE,2010,115(5):3045-3055.
APA Long, Ying-Yun,Liu, San-Rong,Cui, Lei,&Li, Yue-Sheng.(2010).Influence of Branching on the Thermal and Crystallization Behavior of Bimodal Polyethylenes Synthesized with Binary Late-Transition-Metal Catalyst Combinations.JOURNAL OF APPLIED POLYMER SCIENCE,115(5),3045-3055.
MLA Long, Ying-Yun,et al."Influence of Branching on the Thermal and Crystallization Behavior of Bimodal Polyethylenes Synthesized with Binary Late-Transition-Metal Catalyst Combinations".JOURNAL OF APPLIED POLYMER SCIENCE 115.5(2010):3045-3055.
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