） Abstract： A homologous series of novel heterogemini surfactants, (N, N-Dimethyl-N-[3-(alkyloxy)-2-hydroxypropyl]-alkylammonium bromide (referred to as CmOhpNCn; m, n = 10, 8; 12, 8; 14, 8; 16, 8; 14, 10; 12, 12 and 10, 14) has been synthesized
Their thermotropic phase behavior has been 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 (m + 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溏CH2溏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溏 counterion, which is beneficial to stabilizing the liquid crystal phase
Keywords： Heterogemini surfactant;synthesis;thermotropic liquid crystal;hydrogen bonding 下载PDF阅读器 PDF全文下载： 初稿 （ 279 ） 作者简介： 通信联系人： 【收录情况】 中国科技论文在线： 周天华
） 摘要： A homologous series of novel heterogemini surfactants, (N, N-Dimethyl-N-[3- (alkyloxy)-2- hydroxypropyl]-alkylammonium bromide (referred to as CmOhpNCn; m, n = 10, 8; 12, 8; 14, 8; 16, 8; 14, 10; 12, 12 and 10, 14) has been synthesized
Their thermotropic phase behavior has been 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 (m + 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儃CH2儃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儃 counterion, which is beneficial to stabilizing the liquid crystal phase
关键词： Heterogemini surfactant; synthesis; thermotropic liquid crystal; hydrogen bonding Tianhua Zhou
赵剑曦
Synthesis and Thermotropic Liquid Crystalline Properties of Heterogemini Surfactants Containing a Quaternary Ammonium and a Hydroxyl Group[EB/OL]
北京：中国科技论文在线
赵剑曦 * （ 福州大学化学化工学院应用化学系
总览 评价 周天华
Jianxi Zhao * （ Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University
[2009-01-04]
http://www
paper
edu
cn/releasepaper/content/200901-79
