BIOCOMPATIBLE HEMODIALYSIS MEMBRANES MADE OF MODIFIED CELLULOSE

摘要

Cellulose derivatives are disclosed which have the following formula: IMAGE wherein Z is selected from the group consisting of alkylene, alkenylene, alkynylene, cycloalkylene or benzylene or xylylene radicals, which may or may not be substituted; X is selected from the group consisting of -H, -NR2, -N+R3, -CN, -COOH, -SO3H, -SO3H, -PO(OR)2, CONR2 or -Si(OR)3; R is selected from the group consisting of hydrogen, alkyl and alkenyl groups having from 1 to 25 carbon atoms, and cycloalkyl, tolyl and phenyl groups; Y is selected from the group consisting of alkyl, alkenyl, alkynyl groups having from 1 to 36 carbon atoms, which may or may not be substituted, cycloalkyl, phenyl, tolyl and benzyl groups, IMAGE IMAGE (-CH=CH-COOH), and NHR, where R has the same meaning as in X, and m=0 to 2.5 n=0.01 to 2.95, with the provision that, when m=0, n/=1.55, if Y is an alkyl radical with 1 to 5 carbon atoms, 3-(CH2)r radical with r-0, 1 or 2 or a phthalic acid radical, and also the degree of polymerization being higher than 400. These cellulose derivatives can be synthesized by homogeneous reaction in a mixture of dimethylacetamide and/or N-methylpyrrolidone with LiCl, preferably after activation of the cellulose starting material in the absence of LiCl. These cellulose derivatives are suitable for use as membranes and fibers, especially in hemodialysis applications.