Y. Fang et al., INFLUENCE OF DEGREE OF GRAFTING AND GRAFTING TEMPERATURE ON THE PERMEABILITIES OF GRAFTED POLYPROPYLENE MEMBRANES, Journal of applied polymer science, 68(1), 1998, pp. 83-89
Polypropylene dialysis membranes were prepared using cobalt-60 gamma r
adiation to directly graft 2-hydroxyethyl methacrylate (HEMA) onto pol
ypropylene (PP) membranes. The surface structures of both the grafted
membranes and the PP membrane were observed by using FTIR-PAS and ESCA
methods. The X-ray diffraction diagrams of the PP and PP-g-HEMA membr
anes indicated a transformation process of the p-form toward the ct-fo
rm crystallinity with increasing degree of grafting. The SEM data of t
he membrane grafted under a low grafting temperature showed many spher
es of PHEMA embedded in the PP matrix, whose size was well distributed
and increased with the degree of grafting. The influences of the degr
ee of grafting and grafting temperature on the permeabilities of PP-g-
HEMA membranes toward urea and creatinine were studied in a dialyzer.
In all cases, the PP-g-HEMA membrane obtained under higher grafting te
mperature showed higher permeability toward those solutes. The permeat
ion coefficients of urea and creatinine through the PP-g-HEMA membrane
obtained at 59 degrees C were about 10.4 and 28.8 times that through
the PP membrane, respectively. (C) 1998 John Wiley & Sons, Inc.