Ferrocene-based polymers containing azo groups in ...
|Title||Ferrocene-based polymers containing azo groups in their backbone: Synthesis, electrochemical and thermal analysis.|
|Author(s)||Alaa S. Abd-El-Aziz, Patrick O. Shipman, Rawda M. Okasha, K. Michelle D. Copping, Tarek Afifi|
|Journal||Section Title: Chemistry of Synthetic High Polymers, PMSE Preprints|
|Abstract||Ferrocene-based polymers contg. azo groups in their backbone were synthesized by condensation polymn. of a cationic organometallic monomer contg. two azo dye moieties and ferrocene in the backbone as well as pendent cationic iron groups with 1,3-diaminopropane, 4,4'-thiobisbenzenethiol or bisphenol A in the presence of K2CO3. The pendent cationic cyclopentadienyl moieties were then photolytically removed from the polymers yielding neutral polyferrocene analogs. The neutral polyferrocenes had mol. wts. ranging from 8000-12,000. Thermogravimetric anal. of the cationic polymers showed two defined wt. losses, with degrdn. of the azo dye overlapped with the loss of the cyclopentadienyliron moiety at temps. between 210Â°-300Â° and degrdn of the polymer backbone at 400Â°-500Â°. The neutral polyferrocenes displayed a wt. loss assocd. with the degrdn. of the azo dye around 210Â°-300Â°. Degrdn. of the polymer backbone occurred between 400Â°-500Â°. The cationic polymers showed glass transition temps. between 126Â°-164Â°, whereas the neutral polymer displayed glass transition temps. at significantly lower temps., i.e., 85Â°-92Â°. UV-visible studies of the polymers showed they displayed a Î»max similar to that of the unreacted azo dye. [on SciFinder(R)]|
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