Sodium bisulfite-soda lime glass

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. 

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). 

A similar result was achieved on using sodium bisulfite-soda lime glass as an initiator system (9). 

The reaction bottle is placed in a water bath at 40 C and occa- sionally shaken for twenty four hours when using sodium bisulfite-soda lime glass system as initiator and 4 hours when using ceric ammonium sulfate. The product is thoroughly washed with water, left to dry at 60°C and then weighed for the determination of the crude grafting yield. 

NaHSO -SLG sodium bisulfite-soda lime glass. CAS ceric ammonium sulfate. 

Ceric ammonium sulfate and sodium bisulfite-soda lime glass system were used as initiators for grafting polymethyl methacrylate onto bagasse ground to 60 mesh, also onto a mixture of spruce and pine sulfate pulps. 

Due to the presence of glass in the composite samples prepared with the use of sodium bisulfite-soda lime glass system, their hardness was superior to those of the corresponding samples obtained... 

EA ethyl acrylate. MMA methyl methacrylate CAS ceric ammonium sulfate NaHSO -SLG sodium bisulfite-soda lime glass det. deteriorated... 

Prehydrolyzed bagasse led to composites of distinctly low polymer load 2.0%, when Using sodium bisulfite-soda lime glass system as initiator for grafting polymethyl methacrylate (sample 16, Table... 

It has been shown before that composites prepared with the use of sodium bisulfite-soda lime glass system as initiator showed, in general, improved properties, compared with the use of ceric ammoniiim sulfate. The reverse was observed on prehydrolyzing the substrate before grafting. Only, the percent deformation was exception (samples 15 and 16 Table 3). The reverse change or properties may relate to the reverse change of polymer loads. 

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. 

For grafting polymethyl methacrylate onto lignocellulosic. substrates, sodium bisulfite may be used alone, i.e., in the absence of soda lime glass or china clay. It is worthy to mention that grafting onto pure celluloses failed to take place in absence of soda lime glass (9) (2) lignin already present in... 

Silica is less efficient than soda lime glass in initiating the grafting of polymethyl methacrylate in presence of sodium bisulfite (9). The results achieved with semichemical pulp show very high rate and yield of graftings (Figure 8). 

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