Splay Elasticity in an Oligomeric Liquid Crystal

Document Type

Article

Publication Date

9-1-1990

Department

Chemistry and Biochemistry

School

Mathematics and Natural Sciences

Abstract

A magnetically-induced Freedericksz transition was used in conjunction with capacitance techniques to determine the splay elastic constant of the 4,4′-dialkoxyphenylbenzoate monomer ‘5OO5rsquo; [C5H11OC6H4COOC6H4OC5H11] and its dimer. As a function of reduced temperature in the nematic phase, it was found that K 11 of the dimer is only about 20 per cent larger than that of the monomer. Moreover, the values of K 11/S 2 versus reduced temperature, where S is the scalar order parameter, are equal to within experimental noise. These results suggest that for short oligomers Meyer's entropic model for splay elasticity in polymer liquid crystals is not applicable. A lowest order correction to the entropic model is suggested, which partially accounts for excluded volume and dispersive effects.

Publication Title

Liquid Crystals

Volume

8

Issue

3

First Page

437

Last Page

443

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