Influence of pressure on chain and segmental dynamics in polyisoprene

Sebastian Pawlus; Alexei P. Sokolov; Marian Paluch; Michal Mierzwa

doi:10.1021/ma100383r

Influence of pressure on chain and segmental dynamics in polyisoprene

Sebastian Pawlus, Alexei P. Sokolov, Marian Paluch, Michal Mierzwa

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16 Scopus citations

Abstract

We present detailed studies of variation in segmental and chain dynamics of polyisoprene under pressure. Samples with two molecular weights (MW), 2.4 and 25 kg/mol (below and above entanglement), were investigated. Dielectric spectroscopy measurements at isobaric and isothermal conditions exhibit clear differences in temperature and pressure dependencies of chain and segmental relaxation times. Moreover, application of pressure increases time separation between the segmental and normal (chain) modes at the isochronic conditions. This increase can be explained by an effective increase in number of Rouse segments under compression at the same segmental relaxation time. Our analysis also reveals that the thermodynamic scaling of the relaxation times (log _τ vs TV^γ, V is volume) does not work well simultaneously for both processes.

Original language	English
Pages (from-to)	5845-5850
Number of pages	6
Journal	Macromolecules
Volume	43
Issue number	13
DOIs	https://doi.org/10.1021/ma100383r
State	Published - Jul 13 2010
Externally published	Yes

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title = "Influence of pressure on chain and segmental dynamics in polyisoprene",

abstract = "We present detailed studies of variation in segmental and chain dynamics of polyisoprene under pressure. Samples with two molecular weights (MW), 2.4 and 25 kg/mol (below and above entanglement), were investigated. Dielectric spectroscopy measurements at isobaric and isothermal conditions exhibit clear differences in temperature and pressure dependencies of chain and segmental relaxation times. Moreover, application of pressure increases time separation between the segmental and normal (chain) modes at the isochronic conditions. This increase can be explained by an effective increase in number of Rouse segments under compression at the same segmental relaxation time. Our analysis also reveals that the thermodynamic scaling of the relaxation times (log τ vs TVγ, V is volume) does not work well simultaneously for both processes.",

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AU - Pawlus, Sebastian

AU - Sokolov, Alexei P.

AU - Paluch, Marian

AU - Mierzwa, Michal

PY - 2010/7/13

Y1 - 2010/7/13

N2 - We present detailed studies of variation in segmental and chain dynamics of polyisoprene under pressure. Samples with two molecular weights (MW), 2.4 and 25 kg/mol (below and above entanglement), were investigated. Dielectric spectroscopy measurements at isobaric and isothermal conditions exhibit clear differences in temperature and pressure dependencies of chain and segmental relaxation times. Moreover, application of pressure increases time separation between the segmental and normal (chain) modes at the isochronic conditions. This increase can be explained by an effective increase in number of Rouse segments under compression at the same segmental relaxation time. Our analysis also reveals that the thermodynamic scaling of the relaxation times (log τ vs TVγ, V is volume) does not work well simultaneously for both processes.

AB - We present detailed studies of variation in segmental and chain dynamics of polyisoprene under pressure. Samples with two molecular weights (MW), 2.4 and 25 kg/mol (below and above entanglement), were investigated. Dielectric spectroscopy measurements at isobaric and isothermal conditions exhibit clear differences in temperature and pressure dependencies of chain and segmental relaxation times. Moreover, application of pressure increases time separation between the segmental and normal (chain) modes at the isochronic conditions. This increase can be explained by an effective increase in number of Rouse segments under compression at the same segmental relaxation time. Our analysis also reveals that the thermodynamic scaling of the relaxation times (log τ vs TVγ, V is volume) does not work well simultaneously for both processes.

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JO - Macromolecules

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Influence of pressure on chain and segmental dynamics in polyisoprene

Abstract

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