AbstractWheat straw‐g‐polyacrylonitrile (PAN), containing 40 PAN, was saponified with sodium hydroxide and isolated under three sets of saponification and work‐up conditions. Each reaction mixture was separated into a water‐soluble and a water‐insoluble fraction, which were individually analyzed for percentages (by weight) of synthetic polymer (saponified PAN), cellulose, hemicellulose, and lignin. Water solubles amounted to 14–24 of the total product and contained 70–74 synthetic polymer, the remainder being hemicellulose and lignin. Although water‐insoluble fractions contained 52–54 saponified PAN, their water absorbencies were low (14–17 g H2O/g polymer). Treatment of these fractions with the enzyme cellulase converted 55–62 of the total
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