STYRENESULPHONIC ACID COPOLYMER

The apparatus is described and details given of its use with PETP homopolymer, PS/poly(vinyl methyl ether) miscible blend and styrene-styrenesulphonic acid copolymer/ethyl acrylate-4-vinylpyridine copolymer ionomer blend with ionic interactions. Orientation and relaxation curves were obtained for all three samples. It is concluded that the technique is very efficient for obtaining curves with high precision. For these three systems, the relaxation rate increases with temperature. 

Poly(styrene-co-styrenesulphonic acid) copolymers containing 2 to 10 mol % acidic units were mixed in stoichiometric amounts of interacting groups with... 

Radiation-induced grafting29 was used for the preparation of low-cost polyelectrolyte membranes needed for fuel-cells30. Guzman-Garcia and coworkers29 studied the grafting of poly(styrenesulphonic acid)on polystyrene on a copolymer of poly(tetrafluoroethylene) with polystyrene, and with a copolymer of poly(tetrafluoroethylene) with poly(perfluoropropylene). 

Groenendaal [3] prepared water soluble 4-(2,3-dihydro thieno[3,4-b)][l,4] dioxin-2-yl-methoxy)-butane-l-sulfonic acid sodium salt, (IV), and copolymers with poly(styrenesulphonic acid) having a of 290,000 daltons that were used in electroconductive devices. 

Chromatographic and enzymic studies of the insoluble residues obtained by hydrolysis of various cereal starches with acid have suggested a new model for the structure of waxy maize amylopectin. A review dealing with the mechanism of action of a-amylases has discussed the compositions of the residual oligosaccharides. The results of a study of the catalytic activity of poly(acrylic acid-styrenesulphonic acid) towards amylose in aqueous solution at low pH indicated that interactions between the carboxy-groups of the copolymer and the hydroxy-groups of the substrate make no contribution to the rate of reaction. ... 

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