Liquid Crystalline Polyethers Based on Conformational Isomerism. XVI. Hexagonal Columnar Phase( Phi sub h) in a Non-Discotic Copolyether and the Novel 2-Dimensional to 3-Dimensional Phi sub h-S sub B Transition

摘要: Two interesting features of the copolyether based on 1,2-bis(4-hydroxyphenyl)ethane (BPE) and a 1/1 molar ratio of 1,8-dibromooctane and 1,12-dibromododecane (BPE-8/12(1/1)) are described. First, a two dimensionally ordered hexagonal columnar phase is observed, with the columns extending in the chain direction and with no positional order along the columns. Second, lowering the temperature leads to the establishment of longitudinal order through a unique columnar-smectic-B transition. The lateral hexagonal order remains practically unaffected by this transition. Graphs. 15 ref.--AA