Homo- and co-polymers of norbornene containing aryl- ...
|Title||Homo- and co-polymers of norbornene containing aryl- and hetaryl-azo dyes; synthesis and sensing properties.|
|Author(s)||Alaa S. Abd-El-Aziz, Patrick O. Shipman, Paul R. Shipley, Britta N. Boden, Shawkat Aly, Pierre D. Harvey|
|Journal||Macromolecular Chemistry and Physics,|
|Abstract||A series of polynorbornene homo- and copolymers containing aryl- and/or hetaryl-azo dyes were prepared through ring-opening metathesis polymerization (ROMP). Thermal studies indicated that the polymers were thermally stable up to 250 °C, and possessed glass transition temperatures ranging from 93 to 133 °C. In THF solutions, the aryl-azo dye containing homopolymers, displayed λmax = 417 nm while the hetaryl-azo dye containing homopolymers displayed λmax = 495 nm. The copolymers displayed a λmax that encompassed both the aryl- and hetaryl-azo dye range. The monomers and polymers showed bathochromic shifts in solution when acidified. The polymers were cast into films that changed colour in the presence of both aqueous 1.2 M HCl or HCl(g). The colour change reverses when exposed to aqueous 1.2 M NaOH or NH3(g). This process was repeated several times without disintegration of the polymer film, indicating that these polymers may be useful as reusable acid sensors.|
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