Nylon 4/PVA blend membrane for dialysis

Abstract

SYNOPSIST o improve the hydrophilicity and enhance the transport flux of nylon 4 membrane for dialysis, this study attempts to utilize blending nylon 4 with poly (vinyl alcohol) (PVA) .The instability of PVA in water can be significantly improved by esterification of PVA with formic acid when it is used as casting solvent of PVAInylon 4 blend membrane. By this method, the stability of PVA in water can be obtained more easily than by other methods, such as chemical, y-ray irradiated crosslinking, or high-temperature treatment used by previous researchers. The effects of maturation time of the casting solution, nylon 4/PVA ratios, and casting solvent compositions on esterification of PVA, salt permeability, water content, partition coefficient, diffusivity, and mechanical strength of membranes are studied. The membrane, prepared by casting solution of nylon 4/PVA 9 / 1 wt % formic acid with 24-h maturation time, possesses permeabilities of NaCl and urea, 33.14 and 19.67 x cm2/min, respectively.

Electrical properties of sorbitol‐doped poly(vinyl alcohol)–poly(acrylamide‐co‐acrylic acid) polymer membranes

“…Among the various methods of producing high ionic conduction, polymer blend is a valid and feasible approach. 9,10 In agreement with Wieczorek and coworkers, 11,12 the addition of particles (fillers) produces changes in the vitreous transition temperature that alternate the temperature dependence of crystallization and in the ionic conduction of the material.…”

Structural properties of γ‐irradiated poly(vinyl alcohol)/poly(ethylene glycol) polymer blends

“…Other authors improved the instability of the PVA/nylon-4 polymer blend for dialysis by esterfication of PVA with formic acid, which was used as a common casting solution. 6 They reported that this method is easier than chemical, ␥ radiation crosslinking, or high-temperature treatment. Also, other authors investigated the effects on the formation of conjugated double bonds in the thermal degradation of PVA blends with poly(vinyl chloride) using UV absorption and IR spectroscopy.…”

Preparation and characterization of polyvinyl alcohol based biomaterials: Water sorption and in vitro blood compatibility study

“…Hydrogels may be chemically stable or they may degrade and eventually disintegrate and dissolve. These hydrophilic materials are also coined as "hungry networks" and have been widely employed in variety of applications such as artificial implants, 1 in medicine and pharmacy, agriculture, controlled drug delivery systems, 2 dialysis membranes, 3 burn dressings, 4 etc. To serve as biomaterials the hydrogel must meet certain prerequisites such as adequate water sorption, good mechanical performance, and above all, a fair level of blood compatibility.…”