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Citation:
Yu Xiaochun, Hou Gui, Zhang Dehe. MODIFICATION OF HUMIC ACID BY GRAFT COPOLYMERIZATION WITH STYRENE[J]. Chinese Journal of Applied Chemistry,
;1989, 6(1): 36-40.
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Graft copolymerization of styrene. (St) onto humic acid (HA), using H2O2-FeCl2 redox system as initiator in DMOSmedium was investigated.It was found that HA had distinct inhibiting and retarding effect on the polymerization of St,and the ratio of H2O2-FeCl2 was an important factor influencing the graft copolymerization.With increase of the H2O2-FeCl2 ratio,the rate of polymerization increased,while the grafting cfficiency decreased, the grafting degree approched a maximal value when the H2O2-FeCl2 ratio was 3(mol/mol).The grafting efficiency and grafting degree increased with increase of polymerization temperature The ratio of St to HA also had a direct influence on the grafting efficiency and grafting degree but not on the grafting ratio. The appearance of a new adsorption band (1120cm-1) in the IR spectrum of copolymer was attributed to C-O-C link formed in the HA-g-PSt molecule during the polymerization. The product obtained by further sulfonation of graft copolymer is readily Soluble in water, acid and alkalisolution.
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Keywords:
- Humic Acid,
- Styrene,
- Graft copolymerization,
- Sulfonation
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