Miscible blends of cellulose and poly(vinylpyrrolidone)

WAXS, FTIR, DSC, DMA and NMR results showed that blnds of cellulose with PVP are miscible over the whole composition rang and that the miscibilityis driven by hydrogen bond formation between the hydroxyl groups of cellulose and carbonyl groups of PVP. The plot of the measured T g versus composition is not a smooth function but shows a singularity at a blend composition of ca 60:40 w/w cellulose/PVP. This behavior is tentatively interpreted in relation to to the molar ratio of the repeating units of the polymers.