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APS was used as an initiator. The sulfate anion radical that produces from thermal decomposition of APS abstracts hydrogen from the hydroxyl groups of the polysaccharide substrate to form corresponding alkoxy radicals  on the substrate. This persulfate¨Csaccharide redox system results in active centers capable to radically initiate polymerization of monomer led to a graft copolymer. Since a crosslinking agent, e.g., MBA, is presented in the system, the copolymer comprises a crosslinked structure.

À´Ô´£ºPourjavadi, A., F. Seidi, et al. (2008). Grafted CMC/silica gel superabsorbent composite: Synthesis and investigation of swelling behavior in various media. Journal of Applied Polymer Science 108(5): 3281-3290.
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