Free and constrained amorphous phases in polyethylene: Interpretation of 1H NMR and SAXS data over a broad range of crystallinity

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F15%3A43897970" target="_blank" >RIV/60461373:22340/15:43897970 - isvavai.cz</a>
Alternative codes found
RIV/49777513:23640/15:43925221
Result on the web
<a href="http://dx.doi.org/10.1016/j.polymer.2014.12.036" target="_blank" >http://dx.doi.org/10.1016/j.polymer.2014.12.036</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.polymer.2014.12.036" target="_blank" >10.1016/j.polymer.2014.12.036</a>

Result language
angličtina
Original language name
Free and constrained amorphous phases in polyethylene: Interpretation of 1H NMR and SAXS data over a broad range of crystallinity
Original language description
Polyethylene (PE) is available in various grades ranging from high-density to very-low density (co-)polymers. The morphology of PE strongly influences its properties and is extensively studied, including the content of phases. Most studies are usually concerned only with the crystallinity and non-critically adopt the classical three-component model of PE, which considers a crystalline (rigid) and an amorphous (mobile) phase separated by an interfacial (semi-rigid) component. We provide evidence that this assignment of the semi-rigid and mobile components can be incorrect at lower PE densities. The phase composition of industrial PE samples with crystallinities from 35 to 82 wt. % was studied using low-field 1H NMR and the characteristic dimensions of the lamellar stacks were measured using small-angle X-ray scattering (SAXS). Based on our results, we propose a new interpretation of PE morphology at crystallinities below 60 wt. %, which considers the rigid crystalline phase, the constra
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CI - Industrial chemistry and chemical engineering
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
S - Specificky vyzkum na vysokych skolach

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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