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Phase Transition of Side Chain Liquid Crystal Polyecrylate Studied by Positron Annihilation Lifetime Spectra
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
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
1996
发表期刊ACTA PHYSICO-CHIMICA SINICA
卷号12期号:8页码:688-692
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
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.
文章类型Article
关键词Positron annihilation Liquid crystal polymer Free-Volume
学科领域Chemistry
研究领域[WOS]Chemistry
DOI10.3866/PKU.WHXB19960804
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语种英语
WOS类目Chemistry, Physical
WOS记录号WOS:000207600100004
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238274
专题多学科研究中心
作者单位中国科学院高能物理研究所
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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.
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