Ferroelectric nematic phases formed from polar rod-like polymers

由极性棒状聚合物形成的铁电向列相

• 批准号: 08455450
• 负责人: WATANABE Junji
• 金额: $ 5.57万
• 依托单位: Tokyo Institute of Technology
• 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
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455450/
• 关键词: rod-like polymer; nematic phase; ferroelectric phase; second harmonic generation; non-linear optics; polyester; dipale moment; estor linkage; 強誘電相; 非線形光学; ネマチック相; 全芳香族高分子; 極性構造; Cs対称性

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.

以羟基苯甲酸和羟基萘甲酸为单体，合成了不同含量、不同聚合度的芳香族聚酯，并对其热致液晶行为和结构进行了研究。最有趣的是，聚合度大于30-40的聚合物可以形成一种新型的顺磁液晶，这种液晶具有沿着顺磁指向矢的极性有序性。在Cs对称性模型下，采用镜面围绕分子轴旋转无序的方法，很好地模拟了二次谐波产生（SHG）谱随入射SH偏振的变化.这意味着极性双折射液晶是双轴的，其中极性沿着c指向矢以及n指向矢沿着存在。Cs对称性可以通过引入间羟基苯甲酸改变为Cv。这可以用扭结结构的出现来解释，扭结结构可以消除垂直于链轴的极性。

项目成果

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。

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。

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。

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。

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。