A main-chain liquid crystalline polyurethane elastomer (LCPUE) based on biphenyl mesogenic diol(HB6)
poly(tetramethylene oxide)(PTMO)
and hexamethylene diisocyanate (HDI) was studied by solid-state high-resolution variable-temperature 13C-NMR spectroscopy from room-temperature to 130℃. It was revealed that in the heating process
even when temperature exceeds the melting-point of the sample
there still. exist hard-segment micelles with ordered packing structure.The finding is applicable to explain the phenomenon that the liquid-crystalline phase does not aooear in the heating process of LCPUE.