Brillouin scattering from oligomers of polydimethylsiloxane and the assignment of the hypersonic a loss peak in polymers

Alan Adshead; S. M. Lindsay; C. G. Delides; T. A. King; I. W. Shepherd

doi:10.1016/0032-3861(79)90096-X

Brillouin scattering from oligomers of polydimethylsiloxane and the assignment of the hypersonic a loss peak in polymers

Alan Adshead, S. M. Lindsay, C. G. Delides, T. A. King, I. W. Shepherd

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

6 Scopus citations

Abstract

Hypersonic sound speed and loss have been measured in poly(dimethylsiloxane) fluids of viscosities 0.65 to 3.5 × 10⁴ centistoke. Both rise to a plateau level for viscosity values in excess of ∼10 centistokes. Loss measurements as a function of temperature indicate that the α loss temperature (T_α) in the dimer is depressed below 180K compared to 230K in the high molecular weight materials. This molecular weight dependence of T_α is used to account for the hypersonic loss as a function of molecular weight in polystyrene and polypropylene glycol in addition to the assignment of the α loss peak in polydimethylsiloxane.

Original language	English (US)
Pages (from-to)	329-332
Number of pages	4
Journal	Polymer
Volume	20
Issue number	3
DOIs	https://doi.org/10.1016/0032-3861(79)90096-X
State	Published - Mar 1979
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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title = "Brillouin scattering from oligomers of polydimethylsiloxane and the assignment of the hypersonic a loss peak in polymers",

abstract = "Hypersonic sound speed and loss have been measured in poly(dimethylsiloxane) fluids of viscosities 0.65 to 3.5 × 104 centistoke. Both rise to a plateau level for viscosity values in excess of ∼10 centistokes. Loss measurements as a function of temperature indicate that the α loss temperature (Tα) in the dimer is depressed below 180K compared to 230K in the high molecular weight materials. This molecular weight dependence of Tα is used to account for the hypersonic loss as a function of molecular weight in polystyrene and polypropylene glycol in addition to the assignment of the α loss peak in polydimethylsiloxane.",

author = "Alan Adshead and Lindsay, {S. M.} and Delides, {C. G.} and King, {T. A.} and Shepherd, {I. W.}",

note = "Funding Information: The authors would like to record their sincere thanks to Mr Derek Roy of the Department of Chemistry for carrying out the g.p.c, measurements on the samples and to Dr C. Booth of the same department for his advice in the interpretation of the g.p.c, data. Financial support from the Polymer Committee of the S.R.C. for one of us (A. A.) is also gratefully acknowledged.",

year = "1979",

month = mar,

doi = "10.1016/0032-3861(79)90096-X",

language = "English (US)",

volume = "20",

pages = "329--332",

journal = "Polymer",

issn = "0032-3861",

publisher = "Elsevier BV",

number = "3",

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T1 - Brillouin scattering from oligomers of polydimethylsiloxane and the assignment of the hypersonic a loss peak in polymers

AU - Adshead, Alan

AU - Lindsay, S. M.

AU - Delides, C. G.

AU - King, T. A.

AU - Shepherd, I. W.

N1 - Funding Information: The authors would like to record their sincere thanks to Mr Derek Roy of the Department of Chemistry for carrying out the g.p.c, measurements on the samples and to Dr C. Booth of the same department for his advice in the interpretation of the g.p.c, data. Financial support from the Polymer Committee of the S.R.C. for one of us (A. A.) is also gratefully acknowledged.

PY - 1979/3

Y1 - 1979/3

N2 - Hypersonic sound speed and loss have been measured in poly(dimethylsiloxane) fluids of viscosities 0.65 to 3.5 × 104 centistoke. Both rise to a plateau level for viscosity values in excess of ∼10 centistokes. Loss measurements as a function of temperature indicate that the α loss temperature (Tα) in the dimer is depressed below 180K compared to 230K in the high molecular weight materials. This molecular weight dependence of Tα is used to account for the hypersonic loss as a function of molecular weight in polystyrene and polypropylene glycol in addition to the assignment of the α loss peak in polydimethylsiloxane.

AB - Hypersonic sound speed and loss have been measured in poly(dimethylsiloxane) fluids of viscosities 0.65 to 3.5 × 104 centistoke. Both rise to a plateau level for viscosity values in excess of ∼10 centistokes. Loss measurements as a function of temperature indicate that the α loss temperature (Tα) in the dimer is depressed below 180K compared to 230K in the high molecular weight materials. This molecular weight dependence of Tα is used to account for the hypersonic loss as a function of molecular weight in polystyrene and polypropylene glycol in addition to the assignment of the α loss peak in polydimethylsiloxane.

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DO - 10.1016/0032-3861(79)90096-X

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JO - Polymer

JF - Polymer

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ER -

Brillouin scattering from oligomers of polydimethylsiloxane and the assignment of the hypersonic a loss peak in polymers

Abstract

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