Polyvinylalcohol PVAL

Other synthetic polymers that are known to be sensitive to biodegradation are, for example polyurethane, ester-type and some ether-type, polyvinylalcohol (PVAl), poly(ethylene-co-vinyl-... 

Recently, we have studied a variety of sandwich type electrodes for development of enzyme electrodes based on oxidases. In this paper, we focused on extending linearity and blood-compatibility of the outer membrane, i.e., polycarbonate (PC) membrane, without affecting the selectivity. We modified the outer surface of this membrane by plasma polymerization of hexamethyldisiloxane (HMDS) in a glow-discharge reactor or by coating with polyvinylalcohol (PVAL). The PVAL coated surfaces were further treated with an anticoagulant, i.e., heparin. We studied the linearity, selectivity and blood-compatibility of these membranes and related electrodes. Here, we present the results of these studies. 

Albumin Adsorption on Dye Attached PS Particles. In this part of the study, we prepared dye attached monosize PS particles (4 pm in size) for specific albumin adsorption. In order to attach the dye (i.e., Cibacron Blue F3G-A), firstly, the PS particles were coated with polyvinylalcohol (PVAL) by simple adsorption from aqueous solution containing Na2S04 at 25 C. The adsorbed PVAL layer on the PS surfaces was then chemically cross-linked by using terephatalaldehyde (TPA). For the attachment of dye, the PVAL coated PS particles were incubated with an aqueous solution of Cibacron Blue containing also NaOH in a sealed reactor for 4 h at a 400 rpm of stirring rate and a constant temperature of 80 C. Details of these procedure was given elsewhere (67). 

Butyl Rubber Natural Rubber Neoprene Rubber Nitrile Rubber Polyvinylalcohol - PVAL Polyvinylchloride - PV C Viton ... 

Estapol, a blend of polyester/polyether resins NA, not available PBA, polybutyl acrylate PUV, polyurethane varnish PVAL, polyvinylalcohol SVF, silicone vacuum fluid fiber volume fraetion. 

Linearity Tests. In these tests, sandwich type of laminates were prepared by using the PC membrane with a 0.05 LLm pore size as the inner membrane. The GOD layer was prepared by the method described above. As the outer membrane, the PC membranes with different pore sizes (i.e., 0.01, 0.03, 0.05 p,m), the glow-discharge treated PC membrane (PC/HMDS), the polyvinylalcohol coated PC membranes (PC/PVAL) and the heparin attached PC/PVAL membranes (PC/PVAL/H) were... 

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