TY - JOUR A1 - Schleeh, Thomas A1 - Rötting, Oliver A1 - Bettge, Dirk A1 - Hinrichsen, Georg A1 - Koßmehl, Gerhard T1 - Alkoxy-substituted liquid-crystalline aromatic copolyesters N2 - Number-average molecular weights, M,, up to 25 OOO, and inherent viscosities, vinh, up to 2,88 dL/g, were found for the soluble members of an alkoxy-substituted copolyester series (HTO5-X series). A liquid-crystalline (high-temperature) phase was distinguished by IR and wide-angle Xray scattering on molten and quenched samples in form of a nematic sanidic phase. In this phase no relationship exists between the orientation of the aromatic polyester backbone and that of the laterally attached alkoxy groups. Further, it was proven by IR that only the polyester backbone can be aligned by shear stress. If the applied shear stress is very strong, the orientation of the stiff backbone becomes sensitive to disturbances caused by mechanical forces. KW - Liquid-crystalline polymer PY - 1993 DO - https://doi.org/10.1002/macp.1993.021940304 VL - 194 IS - 3 SP - 791 EP - 798 PB - Wiley AN - OPUS4-62468 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -