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Graft polymers of eucalyptus lignosulfonate calcium with acrylic acid: synthesis and characterization
De-Zhan Ye1, Xian-Cai Jiang1, Chao Xia1
1Polymer Research Institute, Sichuan University, Chengdu 610065, PR China; State Key Laboratory of Polymer Material Engineering, Sichuan University, Chengdu 610065, PR China.
Abstract:
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 1,727 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°C and t=2h 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.
