Synthesis and thermotropic liquid crystalline properties of heterogemini surfactants containing a quaternary ammonium and a hydroxyl group

被引:32
作者
Zhou, Tianhua [1 ]
Zhao, Jianxi [1 ]
机构
[1] Fuzhou Univ, Coll Chem & Chem Engn, Dept Appl Chem, Fuzhou 350002, Peoples R China
基金
中国国家自然科学基金;
关键词
Heterogemini surfactant; Synthesis; Thermotropic liquid crystal; Hydrogen bonding; SOLID-PHASE-TRANSITIONS; GEMINI SURFACTANTS; SALTS; BEHAVIOR; ACID;
D O I
10.1016/j.jcis.2008.11.056
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A homologous series of novel heterogemini surfactants, (N,N-dimethyl-N-[3-(alkyloxy)-2-hydroxypropyl]alkylammonium bromide (referred to as C(m)OhpNC(n); m, n = 10, 8; 12, 8; 14, 8; 16, 8; 14, 10; 12, 12 and 10, 14) were synthesized. Their thermotropic phase behavior was investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), infrared spectroscopy (IR) and X-ray diffraction (XRD). All the compounds showed high thermal stability and formed enantiotropic thermotropic smectic A liquid crystals. The mesophase region was sensitive to the overall length (m + n) of the two hydrophobic tails and was widened with increasing (in + n). When fixing the overall length of the two hydrophobic tails (m + n = 24). the liquid crystal region was affected little by the dissymmetry of the two hydrophobic chains. The combination of IR and XRD results suggested the cis-configuration of the alkyl chain and the alkoxy chain with respect to the extended N-CH2-CH(OH) skeleton in both crystal lattice and liquid crystal mesophase. The folding of the alkoxy chain at the carbon atom connecting the hydroxyl group led to the hydrogen bonding between the hydroxyl and the Br- counterion, which is beneficial to stabilizing the liquid crystal phase. (C) 2008 Elsevier Inc. Ali rights reserved.
引用
收藏
页码:476 / 483
页数:8
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