Synthesis and characterization of a nematic homo-polyurethane.

The presence of hydrogen bonds in the chem. structure of polymers promotes and stabilizes the cryst. phase. For liq. cryst. (LC) polymers, the side insertion of aliph. units to the mesogenic unit is a suitable artifice to decrease the cryst. stability, without significantly affecting the stability of the LC phases. The synthesis of a LC homo-polyurethane with high hydrogen bond concn. along the chain and bearing an n-pentyl side-chain was reported