Solubility grafted

Strongly anionic, highly water-soluble, graft copolymers of starch can be made by adding 2-propenamide and sodium 2,2-dimethyl-3-imino-4-oxohex-5-ene-1-sulfonate (Na DMIH) to the polymerization reactions. See references 43 and 56 for a discussion of these polymers. 

Since the PC group is a polar head of a major lipid component of the cell membrane of red blood cell which is the only nonadherent cell among various blood cell types, a biomimetic approach to incorporating the PC group on the surface at the terminal end of water-soluble graft polymers has been... 

Mastication of natural rubber with elastomers which do not give gel allows the synthesis of soluble graft or block copolymers, depending on the tendency for chain rupture and transfer reactions. 

Polymeric carbon nanocomposites are often functionalized with matrix polymers. An example is the functionalization of SWNTs and MWNTs with poly(vinyl alcohol) using a carbodiimide mediated esterification reaction. Also, poly(ethylene-co-vinyl alcohol) is used for this purpose to produce DMSO soluble functionalized SWNTs. In a similar manner poly(m-aminobenzene sulfonic acid) is covalently bonded to SWNTs to form water soluble graft copolymers. ... 

In all instances of the dispersion polymerization, amphiphilic graft copolymers produced in a selective solvent for the branches play a crucial role. Schematically, a microsphere obtained by copolymerization in this way with a small amount of macromonomer has a core-shell structure as given in Fig. 2, with the core occupied by the insoluble substrate polymer chains and the shell by the soluble, graft-copolymerized macromonomer chains. The backbone chains of the graft copolymers, which must be insoluble in the medium, serve as the anchors into the core. The following section presents general criteria for the size control of polymeric microspheres by dispersion copolymerization... 

Soluble graft copolymers were also synthesized by Bolognesi and others [104-106] by grafting polyene chains to a soluble polymer matrix. 

Gel content of sample (wt%) Butadiene content isolated gel (wt%) Soluble graft content A (calculated on original sample) (wt%) Gel butadiene content B (calculated on original sample) (wt%) Total butadiene content (A+B) (calculated on original sample) (wt%) Amount of original rubber unsaturation in the sample C = (A+B) X 100%... 

Crompton and Reid used these procedure to study the distribution of rubber added in several laboratory preparations of high impact polystyrene containing 6% of a styrene-butadiene rubber and 94% styrene, ie. theoretical 4.1% butadiene. The results in Table 2.1 show the way in which the added unsaturation of 4.1% butadiene distributes between the gel and soluble fiuctions the butadiene content of the separated gel remains fairly constant, in the 20 - 25% region, regardless of the quantity of gel present in the sample. As the gel content increases, therefore, so more of the rubber becomes incorporated into the gel and less remains as free rubber or soluble graft. The recovered... 

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