Abstract
Poly(ether - ester)s containing azobenzene mesogen were prepared from cardanol, a natural renewable resource and waste of the cashew industry. The azobenzene group containing cardanol (HPPP) was synthesized by the coupling reaction between diazotized aminophenol and cardanol. Further, it was alkylated with 3 – bromopropanol by Williamson’s etherification process to 3- {4- [4-(3- hydroxy propoxy) phenylazo] -3- pentadecyl phenoxy} propan – 1 – ol(3-HPPP). This dihydroxy compound was characterized by CHN analyzer, UV and 1H and 13C - NMR spectroscopies. A series of azobenzene mesogen containing poly (ether – ester)s were synthesized from 3-HPPP and various aliphatic and aromatic diacid chlorides by solution polycondensation technique. The molecular structure of the monomer and polymers was confirmed by FTIR, 1H and 13C - NMR spectral analyses. These polymers were studied for their thermal stability and photochemical properties. Thermal properties were evaluated by TGA and DSC. Hot-stage optical polarizing microscopy (HOPM) study showed that most of the polymers exhibit smectic and highly ordered band structure. The photo-switching property of azopolymers was investigated using UV – Vis spectroscopy and noticed that trans to cis isomerization occurs within 35 s in DMF, whereas reverse process takes place in 4 h in DMF solvent.
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.
