Liquid Crystalline lonomers. Ii. Main Chain Liquid Crystalline Polymers with Terminal Suifonate Groups
Journal of Polymer Sciencer. Part A: Polymer Chemistry, vol. 30, 989-996 (1992)，-0001，（）：
Liquid crystalline ionomers containing sulfonate groups on the terminal unit of the chain were synthesized by an interfacial condensation reaction of 4,4'-dihydroxy-a,a'-dimethyl benzalazine, the monofunctional dye fast yellow (FY), and a 50/50 mixture of sebacoyl and dodecanedioyl dichlorides. The weight-average molecular weights were estimated from inherent viscosity measurements to be between 6000-11,000 and the sodium sulfonate concentrations ranged from 0-18.4meq/100g polymer. Elemental analyses, however, indicated much higher molecular weights, which suggested that there was a distribution of chains with one, two, or no FY endgroups. The polymers were semicrystalline and melted at ca. 140℃ to form nematic mesophases that were stable over a temperature range of ca. 80℃. They were thermally stable to about 350℃. The ionomeric nature of the polymers was confirmed by the presence of intermolecular associations in nonpolar solvents, as demonstrated by dilute solution viscosity measurements.