Cellulose with methyl vinyl sulfone

This section will cover blends of polymers, both exhibiting water solubihty. Many of the water soluble polymers have been noted in earher sections in this chapter to exhibit misci-bihty with non-water soluble polymers. These water soluble polymers include poly(ethylene oxide), poly(N-vinyl pyrollidone), poly(vinyl amine), polyacrylamide, poly(N,N-dimethyl acrylamide poly(acryhc acid), poly(methacrylic acid), poly(ethyl oxazohne), poly(styrene sulfonic acid), poly(vinyl pyridine), poly(vinyl alcohol), hydroxyl ethyl ceUulose, hydroxy propyl cellulose, carboxy methyl ceUulose, poly(itaconic acid) and poly(ethyleneimine) (several structures shown below). [Pg.191]

PVOH miscibility has been noted with poly(N, N-dimethyl acrylamide) [962] and partial miscibility noted with methyl cellulose [963]. With poly(N, N-dimethyl acrylamide), vinyl alcohol-vinyl acetate copolymers are miscible above 12 mole% vinyl alcohol. Fully hydrolyzed PVOH is not miscible with poly(2-ethyl oxazoline)(PEOx), but ethylene-vinyl alcohol copolymers (68 and 78 mole% vinyl alcohol) are miscible with PEOx [964]. Vinyl acetate-vinyl alcohol copolymers were shown to be miscible with PEOx over a wide range of copolymer compositions [965]. The immiscibility of fully hydrolyzed PVOH was attributed to the hydroxyl self-association dominating the competing hydroxyl-amide association. PVOH blends with sodium polystyrene sulfonate gave flexible, transparent films with good electrical conductivity [966]. Phase separation of PVOH/PEO [967] and PVOH/hydroxypropylmethyl cellulose blends [968] has been reported. PVOH/polyethyleneimine blends have been studied for membrane separations involving isomer separation [969]. PVOH/poly(ethyl oxazoline) blends have noted in a series of patent applications related to proton-conducting membranes [970]. [Pg.196]

The membrane surfaces have also been grafted or coated with polyacrylamide, poly(acrylic acid) [70, 71], poly(vinyl alcohol) and cellulose derivatives [72]. Another possibility for improving the membrane properties is the use of polymer blends. Blends of PVDF/PVP [73, 74], PVDF/poly(ethylene glycol) (PEG) [75], PVDF/sulfonated polystyrene [76], PVDF/poly(vinyl acetate) [77] and PVDF/ poly(methyl methacrylate) [78] have been used in the preparation of micropor-ous membranes. [Pg.26]