Synthesis and phase behavior of novel poly(urethane-urea)s based on 4,4'-bis(2-hydroxyethoxy)biphenyl, 2,4-tolylene di-isocyanate and poly(oxypropylene)diamines

A. Wolinska-Grabczyk; J. Muszynski; Piotr Penczek

doi:10.1117/12.301307

1 January 1998 Synthesis and phase behavior of novel poly(urethane-urea)s based on 4,4'-bis(2-hydroxyethoxy)biphenyl, 2,4-tolylene di-isocyanate and poly(oxypropylene)diamines

A. Wolinska-Grabczyk, J. Muszynski, Piotr Penczek

Author Affiliations +

Proceedings Volume 3319, Liquid Crystals: Chemistry and Structure; (1998) https://doi.org/10.1117/12.301307
Event: Liquid Crystals, 1997, Zakopane, Poland

Abstract

Novel liquid crystalline poly(urethane-urea)s (PUUs) were synthesized from 2,4-tolylene diisocyanate, 4,4'-bis(2- hydroxyethoxy)biphenyl and poly(oxypropylene)diamines (Jeffamine). The poly(urethane-urea)s were characterized by FTIR, GPC, DSC and polarizing microscopy. The mesomorphic properties of the polymers were investigated as a function of their molecular structure by changing alternatively the molecular weight of Jeffamine or the initial diol and diamine composition. The applied structural modifications allowed us to obtain thermotropic PUUs exhibiting mesomorphic behavior in a wide temperature range along with the PU exhibiting no liquid crystallinity.

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A. Wolinska-Grabczyk, J. Muszynski, and Piotr Penczek "Synthesis and phase behavior of novel poly(urethane-urea)s based on 4,4'-bis(2-hydroxyethoxy)biphenyl, 2,4-tolylene di-isocyanate and poly(oxypropylene)diamines", Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); https://doi.org/10.1117/12.301307

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