Monotropic smectic A to double layer smectic C transition of biphenyl containing liquid crystal acetylene

Monotropic smectic A to double layer smectic C transition of biphenyl containing liquid crystal acetylene
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含联苯液晶乙炔的单向近晶A到双层近晶C的转变

DOI:
10.1016/j.cclet.2011.06.013
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发表时间:
2011-11
影响因子:
9.1
通讯作者:
Tang, Ben Zhong
Tang, Ben Zhong
中科院分区:
化学1区
文献类型:
--
作者:
Yu, Zhen Qiang;Zhu, Cai Zhen;Zhang, Zhe;Liu, Jian Hong;Lam, Jacky W. Y.;Tang, Ben Zhong

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合成了5-[(4′-庚氧基-4-联苯基)羰氧基]-1-戊炔(A-3,7),采用差示扫描量热法(DSC)、广角X射线衍射(WAXD)、偏光显微镜(PLM)等手段研究了其相结构和相变,并采用分子动力学模拟方法模拟了其晶相和液晶相的分子堆积。结果表明,样品在冷却过程中晶化前形成亚稳SmA和SmC 2相,在加热过程中晶相直接转变为各向同性相。
5-[(4′-Heptoxy-4-biphenylyl)carbonyloxy]-1-pentyne (A-3, 7) was synthesized and the phase structures and transitions were investigated by differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD), polarized light microscopy (PLM) and the molecular packing in the crystal and liquid crystalline phases were simulated by molecular dynamic simulation. The results showed that the sample formed thermodynamically metastable SmA and SmC2phases before crystallized during cooling and the crystal phase directly transformed into isotropic phase during heating.
DOI: 10.1039/a903052b
发表时间: 1999
影响因子: --
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