Polyurethane–epoxy based azopolymers: Influence of chemical structure over photoinduced birefringence |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Fine Chemicals Green Manufacturing, Henan Normal University, Xinxiang 453007, PR China;2. Department of Chemistry, Xinxiang Medical University, Xinxiang 453007, PR China;1. Department of Mechanical Engineering, National Central University, Jhong-Li District, Tao-Yuan City 32001, Taiwan;2. Division of Nuclear Fuels and Materials, Institute of Nuclear Energy Research, Lung-Tan District, Tao-Yuan City 32546, Taiwan;1. Seethalakshmi Ramaswami College, Trichy;2. Research Department of Chemistry, Seethalakshmi Ramaswami College, Trichy;1. Instituto de Cerámica y Vidrio (CSIC), Campus de Cantoblanco, Madrid, 28049, Spain;2. Departamento de Física Aplicada, Universidad de Vigo, E. T. S. de Ingenieros Industriales, Campus Universitario, Vigo, E36310, Spain;3. Departamento de Física, Universidade Estadual de Ponta Grossa, Av. Gen. Carlos Cavalcanti 4748, Ponta Grossa, 84.030-000, Paraná, Brazil |
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| Abstract: | A comparative study of the influence of the competitive reactions that can take place in epoxy–isocyanate based azo systems over optical behavior was developed.Diverse disperse red 19 (DR 19) azo urethane oligomers (PUs) were synthesized and characterized using size exclusion chromatography (SEC), Fourier transform infrared (FTIR), and UV–visible spectroscopy. Based on these urethane oligomers, epoxy-PU networks having isocyanurate and oxazolidone rings in their structures were prepared in different isocyanate/epoxy stoichiometric ratios, r = eq. NCO/eq. epoxy (0.5, 1, and 2).Photoinduced anisotropy (Δn), remnant birefringence (RB) and dichroism were measured for the resulting polymers and evaluated as function of their Tgs and chemical structures. Final materials exhibited very high values of Δn and RB being promised materials for using in optical storage information devices. |
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