Phase Transition of Side Chain Liquid Crystal Polyecrylate Studied by Positron Annihilation Lifetime Spectra

	Phase Transition of Side Chain Liquid Crystal Polyecrylate Studied by Positron Annihilation Lifetime Spectra
	Wang WH(王文华); Wei L(魏龙); Zhang TB(张天保); Wang, WH; Wei, L; Zhang, TB; He, L; Zhang, SF; Qi, ZN
刊名	ACTA PHYSICO-CHIMICA SINICA
	1996
卷号	12 期号:8 页码:688-692
关键词	Positron annihilation Liquid crystal polymer Free-Volume
其他题名	侧链型丙烯酸醋共聚物相变的正电子湮没谱研究
通讯作者	[Wang Wenhua ; Wei Long ; Zhang Tianbao] Acad Sinica, Inst High Energy Phys, Lab Nucl Anal Tech, Beijing 100080, Peoples R China ; [He Liu ; Zhang Shufan ; Qi Zongneng] Acad Sinica, Inst Chem, Beijing 100080, Peoples R China
英文摘要	The results of positron annihilation studies on the side-chain polymer liquid crystals were obtained as a function of temperature. It is indicated that thermotropic liquid crystal has two phase transition points near 40 degrees C and 76 degrees C respectively. It is suggested that the first phase transition point is correspondent to the melting point of specimen and the second one is clearing point at which liquid crystal phase transits isotropic liquid phase. It can be concluded by the changes of Free-Volume at the phase transition points that the smectic state S-A is in better ordered state than the other liquid crystals. The difference in the curves of o-Ps life-time with temperature between the liquid crystal and the liquid crystal polymer was explained.
学科主题	Chemistry
类目[WOS]	Chemistry, Physical
研究领域[WOS]	Chemistry
原文出处	SCI
语种	英语
WOS记录号	WOS:000207600100004
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/238274]
专题	高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Wang WH,Wei L,Zhang TB,et al. Phase Transition of Side Chain Liquid Crystal Polyecrylate Studied by Positron Annihilation Lifetime Spectra[J]. ACTA PHYSICO-CHIMICA SINICA,1996,12(8):688-692.
APA	王文华.,魏龙.,张天保.,Wang, WH.,Wei, L.,...&Qi, ZN.(1996).Phase Transition of Side Chain Liquid Crystal Polyecrylate Studied by Positron Annihilation Lifetime Spectra.ACTA PHYSICO-CHIMICA SINICA,12(8),688-692.
MLA	王文华,et al."Phase Transition of Side Chain Liquid Crystal Polyecrylate Studied by Positron Annihilation Lifetime Spectra".ACTA PHYSICO-CHIMICA SINICA 12.8(1996):688-692.