Molecular weight grafted side chains

In addition, there is the difficulty of controlling the grafted side chains in molecular weight distribution. In the context of this chapter, the authors hope to give a systematic, comprehensive, up-to-date review on the various methods of grafting, the methods used for characterization of grafted substrates, and their possible end use applications. 

Molecular Weight of Grafted Side Chains. In previous work the wool had been hydrolyzed away from the grafted material in order to isolate the polystyrene side chains. Sodium hydroxide was used with good results however, about one-half of the polystyrene was soluble in only such solvents as dimethyl formamide and benzene-methanol mixtures. Infrared examination showed the presence of groupings charac-... 

From the graphic representations of the results it is obvious that the preparation method has a pronounced influence on the form of the molecular weight distribution of the grafted side chains. The distribution of the sample prepared by the mutual irradiation technique is very broad with the emphasis on the low molecular weight side. The calculated values of the molecular weight yielded a ratio as high as MJMn = 9.2. 

Better control of the molecular weights and molecular weight distribution of the grafted side chains. 

Molecular Weights and Average Number of Cellulose Molecules per Grafted Side Chain. Radiation Grafting of Styrene to Cellophane and Cotton (Taken from Krassig) Ref. 15. 

Molecular Weights and Grafting Frequency (Anhydrous glucose units (AGU) per Grafted Side Chain) Manganic Pyrophosphate Grafting of Acrylonitrile to Cotton Linters (taken from Rinby) Ref. 17. 

The copolymerization of styrene with a styrene-terminated polyisoprene macromonomer using Ni(acac)2/MAO can easily give a high molecular weight graft copolymer having highly isotactic polystyrene as the main chain and polyisoprene as the side chains. 

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