Sodium bisulfite-china clay initiator

Figure 1 shows a slight increase in the rate of grafting when using sodium bisulfite-china clay initiator system compared with sodium bisulfite-soda lime glass, while the increase in the rate of homopolymerization and the conversion % was distinct (Figure 2). 

Sodium bisulfite-china clay proved to be an efficient initiator for homopolymerization and graft polymerization of methyl methacrylate onto cellulose. Grafting reactions using ceric ammonium sulfate, sodium bisulfite-soda lime glass or -china clay are inhibited or retarded on adding soda lignin to the grafting medium. 

China clay having very nearly the empirical composition AI2O3.2Si02 2H2O (13) was used as soda lime glass with sodium bisulfite as an initiator system for grafting polymethyl methacrylate onto cellulose. 

When used with china clay as an initiator, sodium bisulfite prepared one day before gave higher rate of polymerization and conversion %, compared with the one freshly prepared (Figure 2). 

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