Abstract
By using characteristics of carboxyl groups and azo chromophores,the pH sensitivity and thermo-optic properties of the side-chain azo polyelectrolytes were studied.A chromophore molecule containing azobenzene,4-(4′-nitrophenylazo)phenol was synthesized from 4-nitroaniline,sodium nitrite and phenol via diazo-coupling reaction.A side-chain azo polyelectrolyte was obtained from the chromophore molecule,epoxy chloropropane and α-methacrylic acid by free radical polymerization.The chemical structures of azo polyelectrolytes were characterized by FTIR,UV-Vis spectroscopy and()~1H-NMR.The thermal properties were characterized using differential scanning calorimetry(DSC),and the glass transition temperature(T_g) 189.8℃ showed that the azo polyelectrolyte had high thermal stability.Influences of different pH values on the UV-Vis absorption spectra of the azo polyelectrolyte were studied.The results showed that the UV-Vis absorption spectra of the azo polyelectrolyte changed with the pH value and the azo polyelectrolyte had high pH sensitivity.The measurements of refractive index(n) and thermo-optic coefficient(dn/dT) of the azo polyelectrolyte were demonstrated at 650 nm and TM mode by using the attenuated total reflection(ATR) technique. The thermo-optic coefficient(dn/dT) was-1.92479×10~(-4)℃~(-1),which was one order of magnitude larger than that of inorganic glasses such as zinc silicate glass (5.5×10~(-6)℃~(-1)),borosilicate glass(4.1×10~(-6)℃~(-1)) and was larger than the organic material such as polystyrene(1.23×10~(-4)℃~(-1)) and PMMA(1.20×10~(-4)℃~(-1)).These results indicate that the material may be provided to develop the new digital thermo-optic switch with low drive power.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
