Lignin grafting onto cellulose

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. 

Minimizing the percent of added lignin to 0.27 resulted in grafting of the monomers onto cellulose, however, the rate and yield of graftings were sharply decreased compared with those achieved in absence of lignin (Figures 3, 4 and 5). 

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... 

In wood, cellulose is present with lignin, a natural phenolic polymer, described in Sect. 8.3. Kobayshi and coworkers [16] grafted phenolic resins onto cellulose to form an artificial wood polymer. 

Mansour, O.Y., Nagaty, A. and Beshay, A-F. (1982). Grafting of some vinyl monomers onto ligno-cellulose and cellulose in the presence of lignin. In Graft Polymerisation of Lignocellulosic Fibers, Hon, D.N.S. (Ed.). ACS Symposium, 187, pp. 253-268. 

Current approaches to grafting synthetic polymers onto lignin (4-6) and other natural polymers like cellulose (7-11) involve radical polymerization methods (chemical or radiation). Using radical approaches, it is... 

Grafting of Some Vinyl Monomers onto Lignocellulose and Cellulose in the Presence of Lignin... 

Grafting in Presence of Added Lignin. Ceric ammonium sulfate is an effective initiator for grafting polyethyl acrylate and polyacrylonitrile onto pure celluloses (8), while sodium... 

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