Abstract
The effect of processing of polyacrylonitrile membranes by IR radiation at a temperature of 100-150A degrees D is studied. The influence of the processing temperature on the film structure is ascertained. In a film heated at 100A degrees D, a small amount of the double C=N bonds is found. Its further heating to 120A degrees D is accompanied by a change in the chain conformation and an increase in the content of C=N bonds. It is shown that, upon IR processing at 120A degrees D, polyacrylonitrile ceases to dissolve in N-methylpyrrolidone, dimethylacetamide, dimethylformamide, and dimethyl sulfoxide. Heating at 150A degrees D gives rise to the appearance of conjugated D=N-C=N bonds. The analysis of AFM micrographs demonstrates that the processing of the membranes by IR radiation makes their surface rougher, while the size of pores changes slightly. The permeability of the membranes in various media is measured.