STUDIES ON POLYIONIC COMPLEXES DERIVED FROM POLYVINYL ALCOHOL Ⅳ.ANTITHROMBOGENECTTY OF CHARGED POLYIONIC COMPLEXES PREPARED FROM ETHYLENE-VINYL ALCOHOL COPOLYMER
positively and negatively charged polyionic complexes(PICs)derived from ethylene-vinyl alcohol copolymer(EVA) were prepared by mixing of EVA cation and EVAanions which were obtained by introducing 3-sulfonyl-propanyl phosphoryl and 4-phenyl trimethylammonium iodide onto EVA respectively.The antithrombogenceity of there PICs were tested by recalicification method.It was found that the subshtution degree of hydroxy group in EVA chains were above 60%
the ratio (Ar) of the plasma clotting time of the formed neutrally charge PICs against that of bared glass were 8-13 AI of the negatively charged PIC was as high as 110.The apparent permeability of these PIC membranes for small molecular weight electrolytes or neutral molecules such as NaCl