Ferroelectric nematic phases formed from polar rod-like polymers
Ferroelectric nematic phases formed from polar rod-like polymers
批准号:
08455450
负责人:
WATANABE Junji
金额:
$5.57万
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (B)
财政年份:
1996
资助国家:
日本
项目状态:
已结题
起止时间:
1996 至 1997
中文摘要
以两组分的不同馏分和不同聚合度制备了羟基苯甲酸和羟基萘酸组成的芳香聚酯,并对其热致液晶行为和结构进行了研究。得到的最有趣的事实是聚合度大于30-40的聚合物可以沿向列取向形成具有极性有序的新型向列液晶。在沿分子轴旋转无序的镜像平面的Cs对称模型下,较好地模拟了二次谐波产生(SHG)曲线作为SH偏振入射的函数。这意味着极性向列液晶是双轴的,其中极性沿c方向存在,也沿n方向存在。引入间羟基苯甲酸可以改变Cs对称性为cv。这可以很好地解释为扭结结构的出现,它可以消除垂直于链轴的极性。
英文摘要
The aromatic polyesters composed of hydroxy benzoic acid and hydroxy naphthoic acid were prepared with different fractions of two components and different degrees of polymerization, and their thermotropic liquid crystalline behavior and structures were examined. The most interesting fact obtained is that the polymers with the degree of polymerization more than 30-40 can form a novel nematic liquid crystals with polar ordering along the nematic director. The second harmoinc generation (SHG) profiles as a function of incident of SH polarizations are well simulated under the model of Cs symmetry with a mirror plane rotationally disordered about the molecular axis. This means that the polar nematic liquid crystal is biaxial in which the polarity exists along the c-director as well as n-director. Cs symmetry can be altered to C v by the introduction of meta-hydroxy benzoic acid. This can be well explained by the occurence of the kink structure which can extinct the polarity perpendicular to the chain axis.
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J.Watanabe, et al.: "SHG-activefilms formed from unioxial and biaxial nematic liquid crystals with polar ordering" Mol.Cryst.Liq.Cryst.299. 105-109 (1997)
J.Watanabe 等人:“由具有极性排序的单轴和双轴向列液晶形成的 SHG 活性膜”Mol.Cryst.Liq.Cryst.299。
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通讯作者:
J.Watanabe,et al.: "Nematic liquid crystals with polar ordering formed from simple alomatic polyesters" Jpn.J.Appl.Phys.3. 35. L505-L507 (1996)
J.Watanabe 等人:“由简单的芳香族聚酯形成的具有极性有序的向列液晶”Jpn.J.Appl.Phys.3。
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通讯作者:
J.Watanabe, et al.: "Highly-SHG-active nematic liquid crystal formed from aromatic polyester" Nonlinear Optics. 15. 167-170 (1996)
J.Watanabe 等人:“由芳香族聚酯形成的高倍频活性向列液晶”非线性光学。
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J.Watanabe, et al.: "Nematic liquid crystals with palar ordering formed from simple aromatic polyester" Jpn.J.Appl.Phys.35. L505-L507 (1996)
J.Watanabe 等人:“由简单芳香族聚酯形成的具有平面有序性的向列液晶”Jpn.J.Appl.Phys.35。
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通讯作者:
J.Watanabe, et al: "SHG-activetilms formed from uniaxial and bioxial Nematie Lisuid Crystals with Pala, Ordoring" Moi. Cryst. Lig. Cryst.299. 105-109 (1997)
J.Watanabe 等人:“由具有 Pala、Ordoring 的单轴和双轴 Nematie Lisuid 晶体形成的 SHG 活性薄膜”Moi。
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