ICCAS OpenIR
New insights into the multiple melting behaviors of the semicrystalline ethylene-hexene copolymer: Origins of quintuple melting peaks
Qiu, Jie1,2; Xu, Donghua1; Zhao, Junchai1; Niu, Yanhua1; Wang, Zhigang1
2008-10-01
Source PublicationJOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
ISSN0887-6266
Volume46Issue:19Pages:2100-2115
AbstractA semicrystalline ethylene-hexene copolymer (PEH) was subjected to a simple thermal treatment procedure as follows: the sample was isothermally crystallized at a certain isothermal crystallization temperature from melt, and then was quenched in liquid nitrogen. Quintuple melting peaks could be observed in heating scan of the sample by using differential scanning calorimeter (DSC). Particularly, an intriguing endothermic peak (termed as Peak 0) was found to locate at about 45 C. The multiple melting behaviors for this semicrystalline ethylene-hexene copolymer were investigated in details by using DSC. Wide-angle X-ray diffraction (WAXD) technique was applied to examine the crystal forms to provide complementary information for interpreting the multiple melting behaviors. Convincing results indicated that Peak 0 was due to the melting of crystals formed at room temperature from the much highly branched ethylene sequences. Direct heating scans from isothermal crystallization temperature (T-c, 104-118 degrees C) were examined for comparison, which indicated that the multiple melting behaviors depended on isothermal crystallization temperature and time. A triple melting behavior could be observed after a relatively short isothermal crystallization time at a low T-c (104-112 degrees C), which could be attributed to a combination of melting of two coexistent lamellar stack populations with different lamellar thicknesses and the melting-recrystallization-remelting (mrr) event. A dual melting behavior could be observed for isothermal crystallization with both a long enough time at a low T-c and a short or long time at an intermediate T-c (114 degrees C), which was ascribed to two different crystal populations. At a high T-c (116-118 degrees C), crystallizable ethylene sequences were so few that only one single broad melting peak could be observed. (C) 2008 Wiley Periodicals, Inc.
KeywordCrystallization Polyolefins Thermal Properties
DOI10.1002/polb.21544
Indexed BySCI
Language英语
WOS IDWOS:000259589100010
PublisherJOHN WILEY & SONS INC
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/63354
Collection中国科学院化学研究所
Corresponding AuthorWang, Zhigang
Affiliation1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Key Lab Engn Plast, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Qiu, Jie,Xu, Donghua,Zhao, Junchai,et al. New insights into the multiple melting behaviors of the semicrystalline ethylene-hexene copolymer: Origins of quintuple melting peaks[J]. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,2008,46(19):2100-2115.
APA Qiu, Jie,Xu, Donghua,Zhao, Junchai,Niu, Yanhua,&Wang, Zhigang.(2008).New insights into the multiple melting behaviors of the semicrystalline ethylene-hexene copolymer: Origins of quintuple melting peaks.JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,46(19),2100-2115.
MLA Qiu, Jie,et al."New insights into the multiple melting behaviors of the semicrystalline ethylene-hexene copolymer: Origins of quintuple melting peaks".JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 46.19(2008):2100-2115.
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