Spectral photosensitization of optical anisotropy in poly(vinyl cinnamate) solid films

Photorefractive Photonics 2017

Kozenkov, V.M.^1 ; Spakhov, A.A.^1 ; Belyaev, V.V.^1,2 ; Chausov, D.N.^1 ; Chausova, O.V.^3 ; Chigrinov, V.G.^4

Moscow Region State University, 10a Radio st., Moscow

105005, Russia^1

Peoples' Friendship University of Russia, RUDN University, 6 Miklukho-Maklaya st., Moscow

117198, Russia^2

University of Technology, 42 Gagarina st., Korolev

141070, Russia^3

Hong Kong University of Science and Technology, Clear Water Bay Road, Kowloon, Hong Kong^4

关键词: Cinnamates;    Donor molecules;    Electronic excitation;    Induced optical anisotropies;    Photo-induced;    Photo-induced anisotropy;    Photoorientation;    Poly(vinyl-cinnamate);   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/867/1/012039/pdf
DOI  :  10.1088/1742-6596/867/1/012039

来源: IOP

【 摘 要 】

We observed possibilities and properties of sensitized photo induced optical anisotropy formation in amorphous poly (vynyl-cinnamate) films (PVCi) and its derivant poly (vynyl-4-methoxy-cinnamate) (PVMCi) under polarized light, including the one which is not absorbed by the supermolecules of the polymeric material. The effect of the induced optical anisotropy involves transferring the energy of electronic excitation from the donor molecules (Michler's ketone or 2-benzoyl-methylene-3, methyl-β-naphthosol) to the scavenger's molecules - PVCi or PVMCi) and photo-topochemical ring formation of cinnamate units in polymeric supermolecules. The discovered photo-induced anisotropy in solid PVCi and PVMCi films provides sensitized photo orientation of low-molecular thermotropic liquid crystals.