Synthesis and properties of two series of H-bonded and non-H-bonded thermotropic liquid crystal monomers

	Synthesis and properties of two series of H-bonded and non-H-bonded thermotropic liquid crystal monomers
	Qiu HJ ; Li M ; Chen XF ; Jing FY ; Zhou EL
刊名	liquid crystals
	1998
卷号	25 期号:3 页码:419-425
关键词	DIFFRACTION POLYMERS
ISSN号	0267-8292
通讯作者	li m
中文摘要	two series of monomers, namely n-1-bromo-(4-(4-nitrophenylazo)phenyloxy]alkanes (bn, n = 2, 3, 4, 5, 6, 8, 10) and n-n-[4-(4-nitrophenylazo)phenyloxy]alkyl diethanolamines (cn, n = 3, 5, 6, 10), were synthesized and characterized. their thermal behaviour was studied by differential scanning calorimetry (dsc), wide angle x-ray diffractometry (waxd) and polarizing optical microscopy (pom) equipped with a hot stage. the results showed that the bns (n greater than or equal to 6) exhibit monotropic nematic liquid crystalline behaviour; no liquid crystalline phase was found for the bns (n < 6), while for the cns, enantiotropic smectic liquid crystallinity for n = 5, 6, 10 was seen, and for n = 3 monotropic smectic phases were found. this different phase behaviour between bn and cn compounds is attributed to their different end groups. the ftir analysis of cn indicated that there exists an intermolecular hydrogen bond between hydroxy groups, so that more stable liquid crystalline phase are formed. the effect of the length of the flexible chain on the thermal behaviour is also discussed.
收录类别	SCI收录期刊论文
语种	英语
WOS记录号	WOS:000075351900017
公开日期	2010-11-04
内容类型	期刊论文
源URL	[http://202.98.16.49/handle/322003/22779]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Qiu HJ,Li M,Chen XF,et al. Synthesis and properties of two series of H-bonded and non-H-bonded thermotropic liquid crystal monomers[J]. liquid crystals,1998,25(3):419-425.
APA	Qiu HJ,Li M,Chen XF,Jing FY,&Zhou EL.(1998).Synthesis and properties of two series of H-bonded and non-H-bonded thermotropic liquid crystal monomers.liquid crystals,25(3),419-425.
MLA	Qiu HJ,et al."Synthesis and properties of two series of H-bonded and non-H-bonded thermotropic liquid crystal monomers".liquid crystals 25.3(1998):419-425.