ICCAS OpenIR
The effect of temperature on nascent morphology of polyethylene polymerized over solution-phase flat model catalysts
Jiang, Shidong2; Kong, Bin2; Han, Wei1; Thune, Peter C.1; Yang, Xiaozhen2; Loos, Joachim1; Yan, Shouke2,3
2009-07-17
Source PublicationPOLYMER
ISSN0032-3861
Volume50Issue:15Pages:3810-3818
AbstractThe structure and morphology of polyethylene (PE) produced during solution polymerization using bis(imino)pyridyl metal catalysts supported by flat SiO(2)/Si(100) wafers were investigated by atomic force microscopy (AFM) and electron diffraction. Depending on the polymerization temperature, ranging from RT to 85 degrees C, different morphologies of the nascent PE have been observed. "Sea weed" like supermolecular structures are the predominant nascent morphologies of the PE polymerized at low temperatures. This should be associated with the high PE yield and high nucleation rate at low temperature; the catalyst is highly active and the PE macromolecules have low solubility in toluene and nucleate immediately after formation. With increasing polymerization temperature, e.g. at 60 or 70 degrees C, larger single crystals with roughly a lozenge shape but saw-tooth-like facets have been created. The multilayer overgrowth of the PE crystals demonstrates that the generated PE materials exceed what is required for single layer crystal growth. At 85 degrees C, decreasing crystal growth rate results in the formation of small PE single crystals. At the same time, the high solubility of the PE in toluene results in continuous diffusion of the macromolecules to the existing PE crystals and therefore single crystals in regular truncated lozenge shape have been formed. Electron diffraction indicates that in the whole temperature range, PE crystallizes in flat-on crystals in chain-folded structure with different chain folding stem length. (C) 2009 Elsevier Ltd. All rights reserved.
KeywordPolyethylene Polymerization Structure And Morphology
DOI10.1016/j.polymer.2009.05.043
Indexed BySCI
Language英语
WOS IDWOS:000268306700050
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/66846
Collection中国科学院化学研究所
Corresponding AuthorLoos, Joachim
Affiliation1.Eindhoven Univ Technol, Dept Chem Engn & Chem, NL-5600 MB Eindhoven, Netherlands
2.Chinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Beijing 100190, Peoples R China
3.Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Jiang, Shidong,Kong, Bin,Han, Wei,et al. The effect of temperature on nascent morphology of polyethylene polymerized over solution-phase flat model catalysts[J]. POLYMER,2009,50(15):3810-3818.
APA Jiang, Shidong.,Kong, Bin.,Han, Wei.,Thune, Peter C..,Yang, Xiaozhen.,...&Yan, Shouke.(2009).The effect of temperature on nascent morphology of polyethylene polymerized over solution-phase flat model catalysts.POLYMER,50(15),3810-3818.
MLA Jiang, Shidong,et al."The effect of temperature on nascent morphology of polyethylene polymerized over solution-phase flat model catalysts".POLYMER 50.15(2009):3810-3818.
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