Dynamics of side-chain liquid-crystalline polymers: A dielectric spectroscopy investigation
| dc.contributor.author | Mierzwa, M. | en |
| dc.contributor.author | Floudas, G. | en |
| dc.contributor.author | Wewerka, A. | en |
| dc.date.accessioned | 2015-11-24T18:29:52Z | |
| dc.date.available | 2015-11-24T18:29:52Z | |
| dc.identifier.issn | 1063-651X | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/16307 | |
| dc.rights | Default Licence | - |
| dc.subject | molecular-weight dependence | en |
| dc.subject | spacer length | en |
| dc.subject | relaxation | en |
| dc.subject | pressure | en |
| dc.subject | behavior | en |
| dc.subject | order | en |
| dc.subject | polymethacrylates | en |
| dc.subject | polyisoprene | en |
| dc.subject | phase | en |
| dc.title | Dynamics of side-chain liquid-crystalline polymers: A dielectric spectroscopy investigation | en |
| heal.abstract | We have studied the dynamics in two side-chain liquid-crystalline derivatives of poly(norbornene diethylester) with dielectric spectroscopy within the temperature range 190-433 K and the pressure range 1-3000 bars. Optical microscopy, x-ray scattering, and differential scanning calorimetry (DSC) revealed the formation of a nematic- and a smectic-A phase, respectively, in the polymers with the shorter and longer spacers. Multiple relaxation processes exist originating from the backbone and mesogenic dipoles. In the smectic-A phase two relaxation processes exist above the DSC glass temperature (alpha and alpha') which merge with decreasing temperature or with increasing pressure. thus suggesting a common molecular mechanism. The faster process is the segmental (alpha) relaxation associated with the dynamic glass transition. whereas the slower process reflects mainly the side-chain dynamics within the smectic layers. Pressure was found to increase the glass temperature in the nematic and smectic phases and the dT(q)/dP was 18.7 and 16.9 K/kbar. respectively. However, the effect of pressure in inducing the isotropic-to-smectic transition is more drastic as dT(S1)/dP = 26.4 K/kbar. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.secondary | <Go to ISI>://000171136200041 | - |
| heal.journalName | Physical Review E | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2001 | - |
| 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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