Pressure-enhanced dynamic heterogeneity in block copolymers of poly(methyl vinyl ether) and poly(isobutyl vinyl ether)
| dc.contributor.author | Mpoukouvalas, K. | en |
| dc.contributor.author | Floudas, G. | en |
| dc.contributor.author | Verdonck, B. | en |
| dc.contributor.author | Du Prez, F. E. | en |
| dc.date.accessioned | 2015-11-24T18:38:26Z | |
| dc.date.available | 2015-11-24T18:38:26Z | |
| dc.identifier.issn | 1539-3755 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/17336 | |
| dc.rights | Default Licence | - |
| dc.subject | miscible polymer blends | en |
| dc.subject | glass-transition | en |
| dc.subject | segmental dynamics | en |
| dc.subject | poly(vinyl methyl-ether) | en |
| dc.subject | dielectric-spectroscopy | en |
| dc.subject | fluctuation model | en |
| dc.subject | temperature | en |
| dc.subject | relaxation | en |
| dc.subject | polyisoprene | en |
| dc.subject | polystyrene | en |
| dc.title | Pressure-enhanced dynamic heterogeneity in block copolymers of poly(methyl vinyl ether) and poly(isobutyl vinyl ether) | en |
| heal.abstract | The static structure factor and associated dynamics have been investigated in a series of block copolymers of poly(methyl vinyl ether) (PMVE) and poly(isobutyl vinyl ether) (PiBVE) using x-ray scattering and dielectric spectroscopy (DS). The origin of the dynamic arrest at the glass temperature (T-g) of PiBVE has been explored by temperature- and pressure-dependent DS and pressure-volume-temperature measurements. Both temperature and volume are responsible for the segmental dynamics but temperature has a stronger effect. The copolymers display a minimal dynamic asymmetry (Delta T(g)similar to 7 K), nevertheless, are spatially and dynamically heterogeneous. Increasing pressure, unlike temperature, enhances the dynamic heterogeneity. This effect originates from the distinctly different pressure sensitivities of the homopolymers and can be traced back to differences in local packing. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1103/Physreve.72.011802 | - |
| heal.identifier.secondary | <Go to ISI>://000230886900065 | - |
| heal.identifier.secondary | http://pre.aps.org/abstract/PRE/v72/i1/e011802 | - |
| heal.journalName | Physical Review E | 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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