Effect of temperature and pressure on the dynamic miscibility of hydrogen-bonded polymer blends
| dc.contributor.author | Mpoukouvalas, K. | en |
| dc.contributor.author | Floudas, G. | en |
| dc.contributor.author | Zhang, S. H. | en |
| dc.contributor.author | Runt, J. | en |
| dc.date.accessioned | 2015-11-24T18:29:41Z | |
| dc.date.available | 2015-11-24T18:29:41Z | |
| dc.identifier.issn | 0024-9297 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/16284 | |
| dc.rights | Default Licence | - |
| dc.subject | miscible blends | en |
| dc.subject | segmental dynamics | en |
| dc.subject | poly(vinyl methyl-ether) | en |
| dc.subject | glass-transition | en |
| dc.subject | alpha-relaxation | en |
| dc.subject | dielectric-relaxation | en |
| dc.subject | polystyrene | en |
| dc.subject | polyisoprene | en |
| dc.subject | spectroscopy | en |
| dc.subject | parameters | en |
| dc.title | Effect of temperature and pressure on the dynamic miscibility of hydrogen-bonded polymer blends | en |
| heal.abstract | The dynamic miscibility of poly(4-vinylphenol)/poly(vinyl ethyl ether) (PVPh/PVEE) blends, with a T-g contrast of 186 K, as well as the PVEE segmental dynamics have been investigated by temperature- and pressure-dependent dielectric spectroscopy. In PVEE the pressure coefficient of T-g amounts to 0.215 KMPa, and its apparent activation volume displays the usual T dependence. Although both temperature and volume contribute to the segmental dynamics, the former has a stronger influence within the T and P investigated. In the blends, dynamic heterogeneity is suppressed because of hydrogen bonds that couple the components segmental dynamics. In the PVEE-rich blends, increasing temperature and pressure results in the broadening of the distribution of relaxation times through the weakening of hydrogen bonds and the associated decoupling of the segmental dynamics. A central result of the present study is the identification of a critical temperature above which the system becomes increasingly heterogeneous. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1021/Ma048585v | - |
| heal.identifier.secondary | <Go to ISI>://000226466700044 | - |
| heal.identifier.secondary | http://pubs.acs.org/doi/pdfplus/10.1021/ma048585v | - |
| heal.journalName | Macromolecules | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2005 | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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