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Photoacoustic evaluation of the thermal effusivity in the isotropic phase of certain comb-shaped polymers

Nibu A George1, C P G Vallabhan1, V P N Nampoori1, A K George2 and P Radhakrishnan1

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The thermal effusivity values in the isotropic phase of certain comb-shaped polymers have been evaluated for the first time using an open photoacoustic cell configuration. The compounds investigated have siloxane and acrylate backbone and they carry mesogenic groups in their side chain. The results indicate that the polymer chain length as well as the side chain length have pronounced influence on the thermal effusivity values in liquid crystalline polymers.


PACS

61.30.Vx Polymer liquid crystals

36.20.Fz Constitution (chains and sequences)

64.70.M- Transitions in liquid crystals

36.20.Cw Molecular weights, dispersity

78.20.Hp Piezo-, elasto-, and acoustooptical effects; photoacoustic effects

Subjects

Atomic and molecular physics

Soft matter, liquids and polymers

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Dates

Issue 3 (22 January 2001)

Received 31 August 2000, in final form 28 November 2000



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