4.7 Article

Graft polymers of eucalyptus lignosulfonate calcium with acrylic acid: Synthesis and characterization

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CARBOHYDRATE POLYMERS
卷 89, 期 3, 页码 876-882

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ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.04.024

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Hardwood lignosulfonate; Acrylic acid; Grafting reaction; Phenolic hydroxyl group

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The graft copolymerization of eucalyptus lignosulfonate calcium (HLS-Ca) from hardwood and acrylic acid (AA) was investigated by using Fenton agent as a coinitiator. The influences of reaction conditions on grafting parameters i.e. product yield (Y%). AA conversion (C%), grafting ratio (G%) and grafting efficiency (GE%) were carefully studied. The effects of the phenolic hydroxyl (Ph-OH) group on the polymerization of AA and grafting reaction were researched. Graft copolymers were identified by the new absorption at 1727 cm(-1), more homogenized morphology and higher decomposition temperature after grafted with AA, as illustrated in FTIR. SEM and TG spectra. The optimum synthesis conditions are as follows: H2O2= 25.2 mol/L, FeCl2 = 63.0 mol/L, T= 50 degrees C and t= 2 h and the optimum percentages of Y, C, G and GE are 97.61%, 95.23%, 71.29% and 78.85%, respectively. The Ph-OH group of HLS-Ca cannot inhibit the polymerization of AA and is involved in the grafting reaction as an active center. (C) 2012 Elsevier Ltd. All rights reserved.

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