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聚乙烯醇中的紫外偏振线性聚炔分子
R.Sata1, H.Suzuki1, N.Ueno1, Y.Morisawa1, M.Hatanaka1, T.Wakabayashi*2,3
1.日本近畿大学化学系,东大阪 577-8502;2.日本奈良科学技术研究所,生驹 630-0192;3.日本科学技术厅,川口 332-0012
摘要:
本文通过研究共轭线性碳链分子,聚炔H(C≡C)nH (n=5∽7)的电子吸收带,设计了适用于UV的光偏振膜. 激光烧蚀的聚炔分子被分散在聚乙烯醇膜中. 结构各向异性的性质使得多炔分子的UV吸收跃迁偶极子与分子轴平行,并且吸收仅发生在沿着分子轴具有电子矢量幅度的电磁波上. 多炔分子在固体聚乙烯醇膜中作为特定波长入射光的偏振分量之一的选择性吸收剂. 使用可旋转的偏振UV光研究包含聚炔分子的拉伸聚乙烯醇膜的吸收强度的角度依赖性,并根据线性二向色性理论中有序参数进行分析.
关键词:  聚炔,紫外线吸收,聚乙烯醇,线性二向色性,线性偏振光,偏振片
DOI:10.1063/1674-0068/cjcp1812273
分类号:
基金项目:
UV-Polarizing Linear Polyyne Molecules Aligned in PVA
R.Sata1, H.Suzuki1, N.Ueno1, Y.Morisawa1, M.Hatanaka1, T.Wakabayashi*2,3
1.Department of Chemistry, Kindai University, Higashi-Osaka 577-8502, Japan;2.Institute for Research Initiatives, Graduate School of Science and Technology, and Data Science Center, Nara Institute of Science and Technology (NAIST), Ikoma 630-0192, Japan;3.PRESTO, Japan Science and Technology Agency (JST), Kawaguchi 332-0012, Japan
Abstract:
Electronic absorption bands of conjugated linear carbon chain molecules, namely polyynes H(C≡C)nH (n=5-7), are exploited to devise light-polarizing films applicable to the UV. Laser ablated polyynes are separated in size and dispersed in a film of polyvinyl alcohol (PVA), which is stretched to align the trapped linear polyyne molecules inside. As a nature of the structural anisotropy, transition dipole of the UV absorption for polyyne molecules is in parallel with the molecular axis and the absorption occurs only for the electromagnetic wave having the amplitude of its electric vector along the molecular axis. Aligned and fixed orientationally in the solid PVA film, polyyne molecules act as selective absorbers of one of the polarization components of incident light at particular wavelength. Using a light source of linearly polarized UV light, whose direction of polarization is rotatable, angular dependence of the absorption intensity is investigated for the stretched PVA film containing aligned polyyne molecules and analyzed in terms of an order parameter in the theory of linear dichroism.
Key words:  Polyyne, UV absorption, Polyvinyl alcohol, Linear dichroism, Linearly polarized light, Polarizer