Effect of degree of acetylation and solvent on the chiroptical properties of lyotropic (acetyl) (ethyl) cellulose solutions
Effect of degree of acetylation and solvent on the chiroptical properties of lyotropic (acetyl) (ethyl) cellulose solutions
复制标题
乙酰化程度和溶剂对溶致（乙酰）（乙基）纤维素溶液手性光学性质的影响
DOI：
10.1002/polb.1994.090321510
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
D. Gray
中科院分区：
文献类型：
--
作者：
J.;D. Gray
乙基取代度（DS）为2.5，乙基取代度（DS）为0 ~ 0.5的（乙酰基）纤维素（AEC）聚合物易于在多种有机溶剂中溶解，在浓溶液中形成手性向列相液晶相。这些液晶的热学性质受到乙酰基含量和溶剂的强烈影响。在二氯甲烷、二溴甲烷、氯仿、溴仿、间甲酚、乙酸和水溶液苯酚中，随着聚合物乙酰基DS的增加，AEC溶性中间相都表现出手性反转，从左向右的超分子螺旋结构转变
(Acetyl) (ethyl) cellulose (AEC) polymers with an ethyl degree of substitution (DS) of 2.5 and acetyl DS ranging from 0 to 0.5 dissolve readily in a wide range of organic solvents and form chiral nematic liquid crystalline phases in concentrated solution. The chiroptical properties of these liquid crystals are strongly influenced by the acetyl content and solvent. In dichloromethane, dibromomethane, chloroform, bromoform, m-cresol, acetic acid, and aqueous phenol, the AEC lyotropic mesophases all show a handedness inversion as the acetyl DS of the polymers is increased, changing from left- to right-handed supermolecular helicoidal structures