Chain Dynamics in the Crystalline Region of Polyethylene Oxide (PEO) as Investigated by Solid-State NMR
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University of Akron / OhioLINK
2015
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=akron1428341117 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-akron14283411172021-08-03T06:29:47Z Chain Dynamics in the Crystalline Region of Polyethylene Oxide (PEO) as Investigated by Solid-State NMR Shi, Jingjun Molecular Physics semi-crystalline polymers,chain dynamics,morphological effects,BPOSS nanoparticle,solid state NMR Several semi-crystalline polymers show molecular dynamics of chains in the crystalline regions in the mechanical ac relaxation temperature range and are categorized as ac mobile crystals. Recently, several groups focused on understanding morphological effects on the molecular dynamics of ac mobile crystals. Until now, it was suggested that local ordering of interfacial segments, lamellae thickness, and entanglements in the amorphous regions, affect crystalline stem dynamics of semi-crystalline polymers. However, several structural effects on dynamics are still controversial in literatures. To clarify structural effects on molecular dynamics of the crystalline chains, well controlled polymer systems are demanded.In this work, we investigated how morphology, lamellae thickness, chain-folding number, and artificial defects made at the surface affect crystalline chain dynamics of poly(ethylene oxide) (PEO) with Mn=5,000 and PDI = 1.05. We prepared single crystals with different chain-folding numbers of 0-2, different thickness of 10- 32 nm, and melt-grown crystals. Besides, we synthesized PEO5k-isobutyl-substituted polyhedral silsesquioxane (BPOSS). BPOSS nanoparticle (giant defects) appeared at the surface of single crystals. One dimensional exchange NMR demonstrated that fully extended chain conformation and giant defect lead to restricted and similar dynamics of PEO stems while presence of chain folding in the single crystals and melt-grown crystals show relatively fast dynamics. 2015-06-04 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1428341117 http://rave.ohiolink.edu/etdc/view?acc_num=akron1428341117 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Molecular Physics semi-crystalline polymers,chain dynamics,morphological effects,BPOSS nanoparticle,solid state NMR |
| spellingShingle |
Molecular Physics semi-crystalline polymers,chain dynamics,morphological effects,BPOSS nanoparticle,solid state NMR Shi, Jingjun Chain Dynamics in the Crystalline Region of Polyethylene Oxide (PEO) as Investigated by Solid-State NMR |
| author |
Shi, Jingjun |
| author_facet |
Shi, Jingjun |
| author_sort |
Shi, Jingjun |
| title |
Chain Dynamics in the Crystalline Region of Polyethylene Oxide (PEO) as Investigated by Solid-State NMR |
| title_short |
Chain Dynamics in the Crystalline Region of Polyethylene Oxide (PEO) as Investigated by Solid-State NMR |
| title_full |
Chain Dynamics in the Crystalline Region of Polyethylene Oxide (PEO) as Investigated by Solid-State NMR |
| title_fullStr |
Chain Dynamics in the Crystalline Region of Polyethylene Oxide (PEO) as Investigated by Solid-State NMR |
| title_full_unstemmed |
Chain Dynamics in the Crystalline Region of Polyethylene Oxide (PEO) as Investigated by Solid-State NMR |
| title_sort |
chain dynamics in the crystalline region of polyethylene oxide (peo) as investigated by solid-state nmr |
| publisher |
University of Akron / OhioLINK |
| publishDate |
2015 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=akron1428341117 |
| work_keys_str_mv |
AT shijingjun chaindynamicsinthecrystallineregionofpolyethyleneoxidepeoasinvestigatedbysolidstatenmr |
| _version_ |
1719437548753780736 |