The Study on Physical and Optical Properties of Ferroelectric Polymers Applying Crystal Technology

应用晶体技术研究铁电聚合物物理和光学性能

• 批准号: 09450355
• 负责人: TAJITSU Yoshiro
• 金额: $ 3.52万
• 依托单位: Yamagata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450355/
• 关键词: Pockels Effects; Linear Electrooptical Effects; Indicatrix; Double Refraction; Ferroelectric Polymers; Vinylidene Fluoride; Trifluoroethylene Copolymers; Principal Refractive Index; Biaxial Crystal; 微小物理量測定; 高分子結晶; Pockelsテンソル; 高分子薄膜

Vinylidene fluoride and trifluoroethylene copolymers (P(VDF/TrFE)) are ferroelectric polymers. P(VDF/TrFE) crystals exhibit the point group C_<2v> symmetry, hence they have five Pockels coefficients (PCFs). Recently, Ohigashi et al. reported that P(VDF/TrFE) formed a highly double-oriented crystalline film (HDCF) with no noncrystalline areas or lamella crystals. The macroscopic axes of the HDCFs (drawing and poling axes) were observed for the first time, to directly correspond to each crystalline axis of the P(VDF/TrFE) crystals. Namely, further progress in the research on the optical behavior of ferroelectric polymers using crystal technology is expected. In this study, we propose for the first time a new experimental system for measuring the optical behavior of polymer thin films (PTFs). Furthermore, using the system, we investigate, mainly, the Pockels effects (PEFs) of HDCF.We developed the experimental system for measuring the indicatrix, double refraction and PEF of PTFs. The sig … More nificant characteristics of this system are as follows. The diameter of the laser beam is reduced while maintaining the degree of polarization so that the laser beam can be introduced in the direction perpendicular to the thickness direction of PTFs, to facilitate measurement of PEF in various directions of PTFs. Furthermore, using this system, we can obtain the change in film thickness simultaneously during measurements of the temperature dependence of double refraction for PTFs. Namely, we can estimate the intrinsic value by correcting the apparent results.Many results were obtained from measuring PEFs of HDCFs using the system, the most significant, of which, are as follows.1) The HDGF satisfies the phenomenological theory of single-crystalline ferroelectric substances.2) The maximum PCF obtained for the HDCF was 20 pm/V, which is significantly larger than that of conventional polymer ferroelectric films (lamella crystalline films).3) The HDCF exhibits structural and optical behaviors similar to those of single crystals. Less

偏氟乙烯-三氟乙烯共聚物（P（VDF/TrFE））是一种铁电聚合物。P（VDF/TrFE）晶体具有点群C<2v>对称性，因此具有五个普克尔系数（PCF）。最近，Ohigashi等人报道P（VDF/TrFE）形成高度双取向的结晶膜（HDCF），没有非结晶区域或片晶。首次观察到HDCF的宏观轴（拉伸和极化轴），直接对应于P（VDF/TrFE）晶体的每个晶轴。展望了利用晶体技术研究铁电聚合物光学行为的新进展。在这项研究中，我们首次提出了一个新的实验系统，用于测量聚合物薄膜（PTFs）的光学行为。在此基础上，我们利用该系统对HDCF的泡克尔斯效应进行了研究，并研制了测量泡克尔斯效应的实验系统，对泡克尔斯效应的折射率、双折射和泡克尔斯效应进行了测量。所述sig ...更多信息 该系统的重要特征如下。在保持偏振度的同时减小激光束的直径，使得激光束可以在垂直于PTF的厚度方向的方向上引入，以便于在PTF的各个方向上测量PEF。此外，利用该系统，我们可以在测量PTFs的双折射温度依赖性的同时获得膜厚的变化。利用该系统测量了HDCF的PCF，得到了如下重要结果：1）HDGF满足单晶铁电体的唯象理论; 2）HDCF的PCF最大值为20 pm/V，这是显着大于传统的聚合物铁电薄膜（层状晶体薄膜）。3）HDCF表现出类似于单晶的结构和光学行为。少

项目成果

田實佳郎: "高分子ゲルの基礎電気特性" 静電気学会誌. 22. 75-78 (1998)

Yoshiro Taman：“聚合物凝胶的基本电性能”静电学会杂志 22. 75-78 (1998)。

Y.Tajitsu: "Dielectric Properties" Gel Handbook, Academic Press, Buurlington, USA.(in press).

Y.Tajitsu：“介电性能”凝胶手册，学术出版社，Buurlington，美国（印刷中）。

Y.Tajitsu, M.Aoki, Y.Kamei, R.Nishina, H.Suzuki and H.Ohigashi: ""Optical Behavior of Ferroelectric"Single Crystalline"Films of Vinylidene Fluoride and Trifluoroethylene Copolymers"" Ferroelectrics. 218. 103-113 (1998)

Y.Tajitsu、M.Aoki、Y.Kamei、R.Nishina、H.Suzuki 和 H.Obigashi：“铁电体的光学行为”单晶“偏二氟乙烯和三氟乙烯共聚物薄膜””铁电体。

Y.Tajitsu: "Effects of Dye Doping on Ferroelectricity in Vinylidene Fluoride and Trifluoroethylene Copolymers" J.Materials.Sci.32. 5737-5741 (1997)

Y.Tajitsu：“染料掺杂对偏二氟乙烯和三氟乙烯共聚物中铁电性的影响”J.Materials.Sci.32。

伊達宗宏: "フッ素系強誘電性高分子の力学・圧電・光学物性" 超音波テクノ. 9,10. 9-13 (1997)

Munehiro Date：“氟基铁电聚合物的力学、压电和光学特性”超声波技术 9,10 (1997)。