Green Semi-IPN Hydrogels by Direct Utilization of Crude Wood Hydrolysates

摘要

Crude and unmodified acetylated galactoglucomannan containing wood hydrolysate (WH) was directly incorporated into a semi-interpenetrating network (semi-IPN) composed of up to 60% renewable polymers. Semi-IPNs were produced by a facile and green synthetic pathway through cross-linking modified carboxymethylcellulose in the presence of at least 30%(w/w) WH, via free radical copolymerization with acrylic acid and N,N′-methylenebis(acrylamide). FTIR verified the presence of WH interlaced with CMC in the semi- IPN, and the highly porous microscopic structure of the networks was confirmed by SEM. The gelation process of these networks was monitored in situ, and their individual 'gel point' (the G′-G″ crossover) was determined by in situ rheological measurements. Semi-IPN hydrogels with various swelling ratios (Q = 20-225) were obtained within 2.8-20 min of a cross-linking reaction.