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4-Phenylazophenol

PEMA

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SY7

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실험 절차

4-Phenylazophenol, [Solvent Yellow 7 (SY7)], a conventional yellow dye obtained from Aldrich Chemical Company in the amount of 10.3 mg was dissolved into a 10.01 g solution of monomers containing 66% PEA, 30.5% PEMA, and 3.3% BDDA by weight respectively giving a SY7 concentration of 0.103 wt %. After dissolving the SY7 into the monomer solution 52.3 mg of bis(4-tert-butylcyclohexylperoxy dicarbonate (Perkadox-16, AZKO Corp.) was added as the polymerization iniator (catalyst). One mm thick sheets were made by placing the SY7 monomer solution via syringe into a mold formed between two glass plates and a 1 mm Teflon gasket. The glass plates were held together with metal clips. Polymerization was effected by placing the mold into a 65° C. oven and curing for 17 hours. The temperature of the oven was raised to 100° C. and the mold heated for 3 hours to effect post-cure of the sheetstock. Approximately 1×2 cm. rectangles were cut from the sheet and the UV/visible measurements performed. The curve exhibited a strong attentuation of the short wavelengths of visible light in the 400 to 500 nm blue light region of the spectrum yielding a 50% transmission level at 473 nm. The rectangular samples were placed into individual tissue capsules and soxhlet extracted in acetone followed by drying in air then under vacuum at 50° C. Afterwards UV/visible measurements were performed again. The UV/visible transmission and absorption spectra were measured both before and after soxhlet extraction and drying. From the absorbance of the samples, at appropiate wavelengths between 400 and 500 rim, the percentage of the dye which is removed by soxhlet extraction was found to be 84%.

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