Studies on Multifunctional Block Copolymers for Holography

全息用多功能嵌段共聚物的研究

• 批准号: 14550293
• 负责人: OGINO Kenji
• 金额: $ 2.56万
• 依托单位: Tokyo University of Agriculture and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550293/
• 关键词: Block Copolymer; Liquid Crystal; Carbazole; Microphase Separation; Charge Transfer Complex; Thioxanthene; Fluorene; Photorefractivity

Novel photorefractive (PR) block copolymers consisting of photoconductive and electro-optically(EO) active blocks were synthesized via the atom transfer radical polymerization (ATRP) of acrylates with cyanobiphenyl (GB) unit followed by the polymerization of acrylate with carbazole(Cz) moiety. In DSC thermogram for block copolymer, two glass transition temperatures corresponding to those for both blocks were observed on the first run indicating that both blocks were microphase separated each other. By four-wave mixing (FWM) experiments for the polymers doped with electron accepting compounds, 25% of diffraction efficiency was observed at 80 V/μm. This value was much higher than that observed in statistical copolymer with the similar chemical composition. In two-beam coupling (2BC) experiments, rnmetri c energy exchange (gain coefficient of 100 cm^<-1>) was observed at 45 V/μm. Novel asymmetric succinate (TH-NVA) containing electron accepting thioxanthone and electron donating 4-(2-nitrovinyl)aniline derivative was synthesized. TH-NVA was found to readily form an amorphous glass when the liquid sample was cooled in air at room temperature. Differential scanning calorimetry revealed that the melting point of crystalline sample and the glass transition temperature of glassy sample are 130 and 44℃, respectively. Absorption tail in longer wavelength region was due to the charge transfer interaction between electron accepting and donating units. In two beam coupling experiments, TH-NVA showed asymmetric energy transfer (coupling gain ; 42cm^<-1>) without an external electric field.

通过丙烯酸酯与氰基联苯（GB）单元的原子转移自由基聚合（ATRP），然后丙烯酸酯与咔唑（Cz）部分的聚合，合成了由光电导和电光（EO）活性嵌段组成的新型光折变（PR）嵌段共聚物在嵌段共聚物的 DSC 热分析图中，在第一次运行时观察到与两个嵌段相对应的两个玻璃化转变温度，表明两个嵌段均是玻璃化转变温度。通过对掺杂有电子接受化合物的聚合物的四波混合（FWM）实验，在80V/μm处观察到25％的衍射效率，该值远高于在具有类似特征的统计共聚物中观察到的衍射效率。在双束耦合(2BC)实验中，在45V/μm下观察到了纳米能量交换(增益系数为100cm^-1)。合成了含有受电子噻吨酮和给电子4-(2-硝基乙烯基)苯胺衍生物的琥珀酸酯(TH-NVA)，当液体样品在室温下在空气中冷却时，TH-NVA很容易形成无定形玻璃。量热分析表明，晶体样品的熔点和玻璃态样品的玻璃化转变温度分别为130℃和44℃，这归因于较长波长区域的吸收尾。在两个光束耦合实验中，TH-NVA 在没有外部电场的情况下表现出不对称的能量转移（耦合增益；42cm^<-1>）。

项目成果

J-M.Jeong, K.Abe, H.Sato, J.Pretula, K.Kaluzynski, K.Ogino: "Synthesis and Characterization of Low Molecular Weight Photorefractive Materials with Thioxanthene Unit"Synthetic Metals. (印刷中).

J-M.Jeong、K.Abe、H.Sato、J.Pretula、K.Kaluzynski、K.Ogino：“含噻吨单元的低分子量光折变材料的合成和表征”合成金属。

J-M.Jeong, H.Sato, J.Pretula, K.Kaluzynski K.Ogino: "Monolithic Photorefractive Molecular Glass with Electron-Transporting Fluorene Unit"Japanese Journal of Applied Physics, Part1. 42. 1655-1659 (2003)

J-M.Jeong、H.Sato、J.Pretula、K.Kaluzynski K.Ogino：“具有电子传输芴单元的单片光折变分子玻璃”日本应用物理学杂志，第 1 部分。

J-M.Jeong, H.Sato, J.Pretula, K.Kaluzynski, K.Ogino: "Monolithic Photorefractive Molecular Glass with Electron-Transporting Fluorene Unit"Japanese Journal of Applied Physics. (印刷中).

J-M.Jeong、H.Sato、J.Pretula、K.Kaluzynski、K.Ogino：“具有电子传输芴单元的单片光折变分子玻璃”日本应用物理学杂志（正在出版）。

J-M.Jeong, K.Ohnishi, H.Sato, K.Ogino: "Observation of Pseudo-Photorefractivity in Monolithic Molecular Glass"Japanese Journal of Applied Physics, Part2. 42. L179-L181 (2003)

J-M.Jeong、K.Ohnishi、H.Sato、K.Ogino：“单片分子玻璃中伪光折变的观察”日本应用物理学杂志，第 2 部分。

J-M.Jeong, H.Sato, J.Pretula, K.Kaluzynski K.Ogino: "Monolithic Photorefractive Molecular Glass with Electron-Transporting Fluouene Unit"Japanese Journal of Applied Physics. Part1,42. 1655-1659 (2003)

J-M.Jeong、H.Sato、J.Pretula、K.Kaluzynski K.Ogino：“具有电子传输氟烯单元的单片光折变分子玻璃”日本应用物理学杂志。