Abstract
The monotropic liquid-crystalline polyurethane [CONHPh(CH 3 )NHCOO(CH 2 ) 6 OPhPhO(CH 2 ) 6 O] n is studied. The development of crystallinity is found to increase the conformational regularity of the polymer and, in particular, lead to development of two unique conformations of TDI urethane linkage in hydrogen bonding. Secondary relaxation processes involving reorientational motion of the inner hexamethylene spacer carbons, possibly a three-bond conformational jump motion, and the biphenyl mesogen are also identified and correlated with mechanically active relaxation processes
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