首页   按字顺浏览 期刊浏览 卷期浏览 Enantiotropic nematic phases of quaternary ammonium halide salts based on trioctadecyla...
Enantiotropic nematic phases of quaternary ammonium halide salts based on trioctadecylamine

 

作者: N. Sharma,   G.A. Nagana Gowda,   C.L. Khetrapal,   R.G. Weiss,  

 

期刊: Liquid Crystals  (Taylor Available online 1997)
卷期: Volume 22, issue 1  

页码: 23-28

 

ISSN:0267-8292

 

年代: 1997

 

DOI:10.1080/026782997209630

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

The neat phases of a series of quaternary ammonium halides based on trioctadecylamine have been investigated by optical microscopy, differential scanning calorimetry, and H NMR spectroscopy. Phase behaviour depends primarily on the structure of the fourth substituent on nitrogen and the thermal history of the samples. For instance, the iodide salts with methyl, ethyl, or propyl as the fourth substituent form enantiotropic nematic phases, while those with a proton or a longer alkyl substituent exhibit complex phase behaviour that does not include a liquid crystalline phase. Possible reasons are advanced for the unprecedented formation of nematic phases.

 

点击下载:  PDF (366KB)



返 回