THERMODYNAMIC STUDY OF THE PHASE TRANSITIONS OF THE MESOGEN H(P)BAB AND THE HOMOLOGOUS TREND OF THE MELTING ENTROPIES

doi:10.3866/PKU.WHXB19890113

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	THERMODYNAMIC STUDY OF THE PHASE TRANSITIONS OF THE MESOGEN H(P)BAB AND THE HOMOLOGOUS TREND OF THE MELTING ENTROPIES
	Wang Bangning; Tan Fu
刊名	ACTA PHYSICO-CHIMICA SINICA
	1989
卷号	5 期号:1 页码:62-66
ISSN号	1000-6818
DOI	10.3866/PKU.WHXB19890113
英文摘要	The phase transitions of N-(p-n-heptyloxybenzylidene)-p'-aminobenzonitrile (H(P)BAB) were studied at various rates within the range 260-380K by DSC. It was revealed by the DSC experiments that the thermotropic nematogen H(P)BAB obtained by the repeated recrystallization from absolute ethanol was the glassy crystal at room temperature in addition to the known, stable and metastable crystal modifications K(I) and K(II). This is the first example of glassy crystal among the meaogens in so far as author's knowledge. The temperature and the heat capacity step of the glass transition of H(P)BAB are 327.05 +/- 0.41 K and 310 +/- 27J K-1 mol(-1), respectively. On the basis of the present author's results and the reliable literature data, the linear relations of the melting entropies with the numbers of carbon atoms in the flexible terminal alkyl groups are presented in the homologues of N-(p-n-alkyloxybenzylidene)-p'-aminonitriles. Improved the Aranow's statistical approach, the slopes of the linear relations have been estimated and are equal to Rin(3/g)(1< <3).
语种	英语
出版者	PEKING UNIV PRESS
WOS记录号	WOS:000207572000013
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/74023]
专题	中国科学院化学研究所
通讯作者	Wang Bangning
作者单位	Acad Sinica, Inst Chem, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Wang Bangning,Tan Fu. THERMODYNAMIC STUDY OF THE PHASE TRANSITIONS OF THE MESOGEN H(P)BAB AND THE HOMOLOGOUS TREND OF THE MELTING ENTROPIES[J]. ACTA PHYSICO-CHIMICA SINICA,1989,5(1):62-66.
APA	Wang Bangning,&Tan Fu.(1989).THERMODYNAMIC STUDY OF THE PHASE TRANSITIONS OF THE MESOGEN H(P)BAB AND THE HOMOLOGOUS TREND OF THE MELTING ENTROPIES.ACTA PHYSICO-CHIMICA SINICA,5(1),62-66.
MLA	Wang Bangning,et al."THERMODYNAMIC STUDY OF THE PHASE TRANSITIONS OF THE MESOGEN H(P)BAB AND THE HOMOLOGOUS TREND OF THE MELTING ENTROPIES".ACTA PHYSICO-CHIMICA SINICA 5.1(1989):62-66.