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)||A. Abd-El-Aziz, P. Shipman, P. Shipley, B. Boden, S. Aly, P. Harvey|
|Journal||Section Title: Inorganic Analytical Chemistry, Macromolecular Chemistry and Physics|
|Abstract||Poly-norbornene homo- and copolymers contg. aryl- and/or hetaryl-azo dyes were prepd. through ring-opening metathesis polymn. (ROMP). Thermal studies indicated that the polymers were thermally stable up to 250Â°, and possessed glass transition temps. ranging from 93 to 133Â°. In THF solns., the aryl-azo dye contg. homopolymers, displayed Î»max = 417 nm while the hetaryl-azo dye contg. homopolymers displayed Î»max = 495 nm. The copolymers displayed a Î»max that encompassed both the aryl- and hetaryl-azo dye range. The monomers and polymers showed bathochromic shifts in soln. when acidified. The polymers were cast into films that changed color in the presence of both aq. 1.2 M HCl or HCl(g). The color change reverses when exposed to aq. 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. [on SciFinder(R)]|
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