Abstract
A series of poly(3,3′, 5,5′-tetraethyldiphenylmethane-1,m-alkanedi-carboxamide(poly(TEDPM-ADA(m=8–18)))) were synthesized from 1,m-alkane-dicarboxylic acids(ADA(m=8–18)) and 4,4′-diamino-3,3′,5,5′-tetraethyl-diphenylmethane by use of direct polycondensation in the presence of triphenylphosphite. The enantiotropic nematic liquid crystals were observed in the m=12–18 and monotropic liquid crystals were observed in the m=8–11 in poly(TEDPM-ADA). Mesogenicity of the polyamides increases with an increase in the number of methylene spacers, m.
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