Influence of pressure on fast dynamics in polyisobutylene

B. Begen; A. Kisliuk; V. N. Novikov; A. P. Sokolov; K. Niss; A. Chauty-Cailliaux; C. Alba-Simionesco; B. Frick

doi:10.1016/j.jnoncrysol.2006.01.119

Influence of pressure on fast dynamics in polyisobutylene

B. Begen, A. Kisliuk, V. N. Novikov, A. P. Sokolov, K. Niss, A. Chauty-Cailliaux, C. Alba-Simionesco, B. Frick

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Influence of pressure on fast dynamics and elastic properties in polyisobutylene is studied using Raman, Brillouin and neutron scattering spectroscopy. Analysis of the results shows that the boson peak frequency increases with pressure stronger than the longitudinal sound velocity measured by Brillouin scattering. Moreover, the boson peak intensity decreases under pressure stronger in Raman scattering than in neutron scattering suggesting a decrease in the light-to-vibrations coupling coefficient C(ν). The strong decrease of the microscopic peak intensity under pressure in Raman spectra supports this suggestion. We argue that variations in C(ν) might be related to amplitude of structural fluctuations. We speculate that change in disorder and/or overall density under pressure is the main cause for the observed variations.

Original language	English
Pages (from-to)	4583-4588
Number of pages	6
Journal	Journal of Non-Crystalline Solids
Volume	352
Issue number	42-49 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jnoncrysol.2006.01.119
State	Published - Nov 15 2006
Externally published	Yes

Keywords

Brillouin scattering
Glass transition
Neutron diffraction/scattering
Polymers and organics
Pressure effects
Raman scattering

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10.1016/j.jnoncrysol.2006.01.119

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title = "Influence of pressure on fast dynamics in polyisobutylene",

abstract = "Influence of pressure on fast dynamics and elastic properties in polyisobutylene is studied using Raman, Brillouin and neutron scattering spectroscopy. Analysis of the results shows that the boson peak frequency increases with pressure stronger than the longitudinal sound velocity measured by Brillouin scattering. Moreover, the boson peak intensity decreases under pressure stronger in Raman scattering than in neutron scattering suggesting a decrease in the light-to-vibrations coupling coefficient C(ν). The strong decrease of the microscopic peak intensity under pressure in Raman spectra supports this suggestion. We argue that variations in C(ν) might be related to amplitude of structural fluctuations. We speculate that change in disorder and/or overall density under pressure is the main cause for the observed variations.",

keywords = "Brillouin scattering, Glass transition, Neutron diffraction/scattering, Polymers and organics, Pressure effects, Raman scattering",

author = "B. Begen and A. Kisliuk and Novikov, {V. N.} and Sokolov, {A. P.} and K. Niss and A. Chauty-Cailliaux and C. Alba-Simionesco and B. Frick",

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doi = "10.1016/j.jnoncrysol.2006.01.119",

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TY - JOUR

T1 - Influence of pressure on fast dynamics in polyisobutylene

AU - Begen, B.

AU - Kisliuk, A.

AU - Novikov, V. N.

AU - Sokolov, A. P.

AU - Niss, K.

AU - Chauty-Cailliaux, A.

AU - Alba-Simionesco, C.

AU - Frick, B.

PY - 2006/11/15

Y1 - 2006/11/15

N2 - Influence of pressure on fast dynamics and elastic properties in polyisobutylene is studied using Raman, Brillouin and neutron scattering spectroscopy. Analysis of the results shows that the boson peak frequency increases with pressure stronger than the longitudinal sound velocity measured by Brillouin scattering. Moreover, the boson peak intensity decreases under pressure stronger in Raman scattering than in neutron scattering suggesting a decrease in the light-to-vibrations coupling coefficient C(ν). The strong decrease of the microscopic peak intensity under pressure in Raman spectra supports this suggestion. We argue that variations in C(ν) might be related to amplitude of structural fluctuations. We speculate that change in disorder and/or overall density under pressure is the main cause for the observed variations.

AB - Influence of pressure on fast dynamics and elastic properties in polyisobutylene is studied using Raman, Brillouin and neutron scattering spectroscopy. Analysis of the results shows that the boson peak frequency increases with pressure stronger than the longitudinal sound velocity measured by Brillouin scattering. Moreover, the boson peak intensity decreases under pressure stronger in Raman scattering than in neutron scattering suggesting a decrease in the light-to-vibrations coupling coefficient C(ν). The strong decrease of the microscopic peak intensity under pressure in Raman spectra supports this suggestion. We argue that variations in C(ν) might be related to amplitude of structural fluctuations. We speculate that change in disorder and/or overall density under pressure is the main cause for the observed variations.

KW - Brillouin scattering

KW - Glass transition

KW - Neutron diffraction/scattering

KW - Polymers and organics

KW - Pressure effects

KW - Raman scattering

UR - http://www.scopus.com/inward/record.url?scp=33750436947&partnerID=8YFLogxK

U2 - 10.1016/j.jnoncrysol.2006.01.119

DO - 10.1016/j.jnoncrysol.2006.01.119

M3 - Article

AN - SCOPUS:33750436947

SN - 0022-3093

VL - 352

SP - 4583

EP - 4588

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

IS - 42-49 SPEC. ISS.

ER -

Influence of pressure on fast dynamics in polyisobutylene

Abstract

Keywords

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