Phase Structures of Nascent Polyethylene Powder Studied by Wideline Proton NMR
The wideline proton NMR spectra of polyethylene powder samples were analyzed in terms of contributions from three components： （1） a rigid part with immobile chains, （2） a soft region with liquid-like character which produces a Lorentzian contribution to the spectrum, and （3） an intermediate region i...
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| Published in | Chinese journal of chemistry Vol. 25; no. 6; pp. 863 - 868 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Weinheim
WILEY-VCH Verlag
01.06.2007
WILEY‐VCH Verlag |
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| Online Access | Get full text |
| ISSN | 1001-604X 1614-7065 |
| DOI | 10.1002/cjoc.200790158 |
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| Abstract | The wideline proton NMR spectra of polyethylene powder samples were analyzed in terms of contributions from three components： （1） a rigid part with immobile chains, （2） a soft region with liquid-like character which produces a Lorentzian contribution to the spectrum, and （3） an intermediate region in which the rotation of methylene groups about C-C bonds is partially hindered. The relative mass fractions as well as chain mobilities varied greatly among samples produced by different polymerization techniques. The NMR crystallinity agreed well with that estimated by WAXD and was much higher than DSC crystallinity, indicating an inclusion of the contribution from a crystalline-amorphous interphase. The crystalline defects in the rigid part could be significantly affected by processing parameters when employing the same type of polymerization technique. The intermediate region in the NMR spectra was analyzed according to the comparison between bimodal high density polyethylene and corresponding linear unimodal one. It was found that the mass fraction of the NMR interphase could be an indication of the percentage of tie molecules between crystalline lamellae and thus may significantly affect the mechanical properties of polymeric material. |
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| AbstractList | The wideline proton NMR spectra of polyethylene powder samples were analyzed in terms of contributions from three components:(1) a rigid part with immobile chains, (2) a soft region with liquid‐like character which produces a Lorentzian contribution to the spectrum, and (3) an intermediateregion in which the rotation of methylene groups about C–C bonds is partially hindered. The relative mass fractions as well as chain mobilities varied greatly among samples produced by different polymerization techniques. The NMR crystallinity agreed well with that estimated by WAXD and was much higher than DSC crystallinity, indicating an inclusion of the contribution from a crystalline‐amorphous interphase. The crystalline defects in the rigid part could be significantly affected by processing parameters when employing the same type of polymerization technique. The intermediate region in the NMR spectra was analyzed according to the comparison between bimodal high density polyethylene and corresponding linear unimodal one. It was found that the mass fraction of the NMR interphase could be an indication of the percentage of tie molecules between crystalline lamellae and thus may significantly affect the mechanical properties of polymeric material. The wideline proton NMR spectra of polyethylene powder samples were analyzed in terms of contributions from three components： （1） a rigid part with immobile chains, （2） a soft region with liquid-like character which produces a Lorentzian contribution to the spectrum, and （3） an intermediate region in which the rotation of methylene groups about C-C bonds is partially hindered. The relative mass fractions as well as chain mobilities varied greatly among samples produced by different polymerization techniques. The NMR crystallinity agreed well with that estimated by WAXD and was much higher than DSC crystallinity, indicating an inclusion of the contribution from a crystalline-amorphous interphase. The crystalline defects in the rigid part could be significantly affected by processing parameters when employing the same type of polymerization technique. The intermediate region in the NMR spectra was analyzed according to the comparison between bimodal high density polyethylene and corresponding linear unimodal one. It was found that the mass fraction of the NMR interphase could be an indication of the percentage of tie molecules between crystalline lamellae and thus may significantly affect the mechanical properties of polymeric material. |
| Author | 严小伟 王靖岱 任晓红 阳永荣 蒋斌波 VODA, Mihai Adrian BERTMER, Marko STAPF, Siegfried |
| AuthorAffiliation | College of Material Science and Chemical Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany |
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| Cites_doi | 10.1002/pola.10981 10.1016/S0032-3861(99)00091-9 10.1002/pol.1978.180160907 10.1002/(SICI)1099-0488(19990215)37:4<323::AID-POLB6>3.0.CO;2-3 10.1002/pol.1953.120100508 10.1021/ma9516753 10.1002/mrc.984 10.1021/jp981753z 10.1007/BF01498892 10.1002/polb.1994.090321614 10.1021/ma9918957 10.1007/BF02086201 10.1021/ma00134a055 |
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| Copyright | Copyright © 2007 SIOC, CAS, Shanghai & WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim |
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| Notes | 31-1547/O6 O632.12 polyethylene powder, wideline NMR, phase structure CSC-DAAD Collaboration Project (2004) ArticleID:CJOC200790158 ark:/67375/WNG-KJP1FNVM-5 the National Natural Science Foundation of China - No. 20490205 istex:E29833F13160430B8638EEDD910A7167A70E23DB Tel.: 0086‐0571‐87951227; Fax: 0086‐0571‐87951227 |
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| Snippet | The wideline proton NMR spectra of polyethylene powder samples were analyzed in terms of contributions from three components： （1） a rigid part with immobile... The wideline proton NMR spectra of polyethylene powder samples were analyzed in terms of contributions from three components:(1) a rigid part with immobile... |
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| SubjectTerms | phase structure polyethylene powder wideline NMR 初生态 宽线质子NMR 相结构 聚乙烯粉末 |
| Title | Phase Structures of Nascent Polyethylene Powder Studied by Wideline Proton NMR |
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