Photomodification of ultrafiltration membranes. 1. Photochemical modification of polyacrylonitrile ultrafiltration membranes with aryl azides.
Acrylonitrile-vinyl acetate copolymer (99:1) membranes were soaked in 0.05 M solns. of aryl azide in MeOH, resulting in an uptake of .apprx.1 * 10-4 mol azide/g membrane. UV photolysis products were examd. for membranes treated with Me 4-azidobenzoate (I) and 8 other arom. azides. The photolysis rate decreased with increasing irradn. time, with surface reactions occurring first. Photolysis products from I were 3, 13, and 5% Me 4-nitroso, 4-nitro-, and 4-aminobenzoate, resp. Strategies for secondary amine formation on the surface were discussed.
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