Calorimetric study of the Paranematic-to-Nematic transition of polydomain side-chain liquid-crystalline elastomers with different mesogen composition |
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Authors: | G?Cordoyiannis B?Ro?i? H?Finkelmann S??umer Z?Kutnjak |
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Institution: | (1) Condensed Matter Physics Department, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia |
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Abstract: | The phase transition behaviour of various nematic side-chain liquid-crystalline elastomers with different mesogen composition
has been explored by means of high-resolution ac calorimetry. Polydomain samples of the same crosslinking density and different
type of mesogens have been investigated. The results show a strong dependence of the phase transition features upon the composition
of the mesogen. The distance from the critical point, reflected in the sharpness of the heat capacity anomalies, increases
when adding a shorter-length mesogen. The results provide new insight for the impact of mesogens on the thermodynamic behaviour
and, thus, on the thermomechanical response of nematic liquid-crystalline elastomers. |
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