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Polyurethanes tri- and tetra blocks functionalized with azo group: synthesis, characterization and evaluation of potential as photo-responsive materials

Grant number: 16/11197-8
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): September 01, 2016
Effective date (End): October 31, 2020
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Maria Isabel Felisberti
Grantee:Germana Maria Santos Paiva
Home Institution: Instituto de Química (IQ). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil


Smart polymers exhibit responsiveness to specific stimuli, for example, to variations in temperature and pH, the incidence light, and others. In your most polymers having responsive characteristics are formed by sensitive segments these stimuli. Among the many types of polymeric materials, polyurethanes segment as allow the combination of blocks or segments with different characteristics allowing thus obtaining an intelligent material capable of responding to specific stimuli. At the case of segmented polyurethanes and photo-responsive a photosensitive compound (chromophore) is responsible for the response to light. Among the various types of chromophores, the azo compounds are most frequently used in the development of polymeric materials photo-responsive. The objective of this project is the synthesis of polyurethanes segmented triblock or tetrablock with photo-responsive macrodiol properties based on poly (ethylene glycol), poly (l-lactide) and poly (trimethylene carbonate) copolymer as a precursor and azo compounds (E)-2,2'-(diazene-1,2-diyl)diphenol; (E)-4-(phenyldiazenyl)benzene-1,3-diol and (E)-4,4'-(diazene-1,2-diyl)dianiline as photochromic compounds. Photo-responsive polymers find applications in optical data storage devices, linear and nonlinear optical materials and photonic devices in general. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SANTOS PAIVA, GERMANA MARIA; TEIXEIRA ALVES DUARTE, LUIS GUSTAVO; FALEIROS, MARCELO MEIRA; ZAMBON ATVARS, TERESA DIB; FELISBERTI, MARIA ISABEL. Z-E isomerization of azobenzene based amphiphilic poly(urethane-urea)s: Influence on the dynamic mechanical properties and the effect of the self-assembly in solution on the isomerization kinetics. EUROPEAN POLYMER JOURNAL, v. 127, MAR 15 2020. Web of Science Citations: 0.

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