Graft copolymerization of granular allyl starch with carboxyl-containing vinyl monomers for enhancing grafting efficiency |
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| Authors: | Manli Li Zhifeng Zhu Enqi Jin |
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| Institution: | (1) Department of Applied Chemistry and Chemical Technology, Rajshahi University, Rajshahi, 6205, Bangladesh;(2) Wood Chemistry Laboratory, Division of Applied Bioscience, Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan;(3) Research & Development Laboratory, Fujibo Holdings, Inc., Oyamacho 410-1394, Japan; |
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| Abstract: | Graft copolymerization of granular allyl starch with carboxyl-containing vinyl monomers using H2O2/Fe2+ initiator in aqueous dispersion was investigated for enhancing grafting efficiency of the copolymerization. The graft copolymerization
was evaluated in terms of grafting efficiency, grafting ratio, and conversion of monomer to polymer. Influences of both allyl
etherification of starch and structures of vinyl monomers used on the copolymerization were revealed. Variables such as molar
ratio of Fe2+ to H2O2, initiator concentration, monomer concentration, polymerization temperature, and time of the graft copolymerization were
also studied. It was found that allyl etherification of starch enhanced the grafting efficiency and grafting ratio evidently.
Acrylic acid exhibited the greatest grafting efficiency and ratio for the copolymerization after starch was allyl-etherified.
The copolymerization should be carried out under the protection of nitrogen gas at 30–35 °C for 3 h by using H2O2/Fe(NH4)2(SO4)2 as initiator. Preferred molar ratio of H2O2/Fe(NH4)2(SO4)2/anhydroglucose was in a range of 20/1/1000 to 60/3/2000. |
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