Thermodynamic investigation on para-alkyl chain-substituted phenylbicyclohexyl-type liquid crystals with difluorooxymethylene bridge

doi:10.1007/s10973-016-5852-5

	Thermodynamic investigation on para-alkyl chain-substituted phenylbicyclohexyl-type liquid crystals with difluorooxymethylene bridge
	Du, Jie 1,2; Wang, Xuelin 2; Tan, Zhicheng 3; Zou, Guanglong 2
刊名	JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
	2017-04-01
卷号	128 期号:1 页码:271-277
关键词	Heat Capacity Liquid Crystal Thermodynamic Functions Physical Properties Measurement System (Ppms) Phase Transition N-ccxb(f f)-f
ISSN号	1388-6150
DOI	10.1007/s10973-016-5852-5
文献子类	Article
英文摘要	We report the results of the study of thermodynamic properties for two difluorooxymethylene-bridged fluorinated liquid crystals. Isobaric heat capacities of the compounds were measured using a Quantum Design Physical Properties Measurement System with heat capacity measurement in the range of 1.9-300 K. Heat capacities of two compounds increased with the temperature increment, and no any thermal anomalies were observed in the whole temperature region, and also the heat capacity values of 5-CCXB(F,F)-F are larger than that of 3-CCXB(F,F)-F due to molecular weight difference even though they are homologs. Standard thermodynamic properties of the liquid crystals were evaluated from the experimental heat capacity temperature dependencies. From the heat capacity results, the standard molar entropies and enthalpies at 298.15 K were determined to be (657.32 +/- 6.57), (741.81 +/- 7.42) J K-1 mol(-1) and (97.17 +/- 0.97), (108.89 +/- 1.09) kJ K-1 mol(-1) for n-CCXB(F,F)-F (n = 3, 5), respectively. Finally, the phase transition sequences and thermodynamical stability of these two fluorinated liquid crystals were performed by differential scanning calorimetry measurements in the temperature range of 253-373 K.
WOS关键词	TEMPERATURE HEAT-CAPACITY ; ENTROPY
WOS研究方向	Thermodynamics ; Chemistry
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000396056500026
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/169290]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Zou, Guanglong
作者单位	1.Guiyang Univ, Coll Chem & Mat Engn, Guiyang 550005, Peoples R China 2.Guizhou Minzu Univ, Sch Chem & Environm Sci, Guiyang 550025, Peoples R China 3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Du, Jie,Wang, Xuelin,Tan, Zhicheng,et al. Thermodynamic investigation on para-alkyl chain-substituted phenylbicyclohexyl-type liquid crystals with difluorooxymethylene bridge[J]. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY,2017,128(1):271-277.
APA	Du, Jie,Wang, Xuelin,Tan, Zhicheng,&Zou, Guanglong.(2017).Thermodynamic investigation on para-alkyl chain-substituted phenylbicyclohexyl-type liquid crystals with difluorooxymethylene bridge.JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY,128(1),271-277.
MLA	Du, Jie,et al."Thermodynamic investigation on para-alkyl chain-substituted phenylbicyclohexyl-type liquid crystals with difluorooxymethylene bridge".JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 128.1(2017):271-277.