Study of Mixed Mesomorphism in Binary Systems of Azo-Ester Mesogens With Structurally Dissimilar Nonmesogenic As Well As Mesogenic Ester Homologues

Abstract

We have studied mixed mesomorphism in four binary systems comprising two azo-ester mesogens, viz. 4-(4′-n-alkoxybenzoyloxy)3-methylphenyl azo-2^″ and 4^″-dimethylbenzenes (where n-alkoxy is n-butoxy or n-hexyloxy), and two ester nonmesogenic and mesogenic components, viz. 4-nitrophenyl-4′-n-alkoxybenzoates (where n-alkoxy is n-butoxy or n-hexyloxy). All the four binary systems are mesogenic in nature, showing nematic phase with threaded/marble texture. The phase diagrams of the binary systems are plotted and eutectic transition temperatures and maximum mesophase ranges of the nematic mesophase in all the systems are determined.

Keywords:

• Azo-ester mesogens
• binary systems
• mixed mesomorphism
• nematic
• nonmesomorphic and mesomorphic ester homologues
• phase diagrams

Acknowledgment

One of the authors (Himanshu S. Bhatt) is thankful to The M.S. University of Baroda, Vadodara, for the financial support.