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.

由羟基苯甲酸和羟基萘酸组成的芳族聚酯酸是由两个组分的不同馏分和不同程度的聚合化制备的，并检查了其热液体晶体的行为和结构。获得的最有趣的事实是，具有30-40以上聚合的聚合物可以形成一种新型的列明液晶体，并沿列神经主管产生极性有序。在CS对称的模型下，第二次和谐产生（SHG）曲线是SH极化入射的函数，其镜面平面围绕分子轴旋转无序。这意味着极性列液晶是双轴的，其中沿C导向和N导向器存在极性。 CS对称性可以通过引入元羟基苯甲酸来改变C V。这可以通过扭结结构的出现来很好地解释，该结构可以灭绝垂直于链轴的极性。

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.: "Ferroelectricity in the lyotropic chdesteric phase in poly-L-glutamate" Jpn.J.Appl.Phys.37. L136-L138 (1998)

J.Watanabe 等人：“聚-L-谷氨酸中溶致胆固醇相的铁电性”Jpn.J.Appl.Phys.37。

J.Watanabe, et al.: "SHG-active films formed from uniaxial 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 活性薄膜”Mol.Cryst.Liq.Cryst.299。

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。