random block copolymers having the formula : ## str1 ## wherein r 1 is -- ch ═ ch -- or j , in which j is zero or an integer from one to eight ; r 2 is selected from hydrogen , straight and branched alkyl and alkylaryl groups containing up to 18 carbon atoms and derivatives or biologically and pharmaceutically active compounds covalently bonded to said copolymer ; each r 3 is independently an alkylene group containing up to 4 carbon atoms ; y is an integer between about 5 and about 3000 ; and f is the percent molar fraction of alkylene oxide in the copolymer and ranges between about 1 and about 99 mole percent . implantable medical devices and drug delivery implants containing the random block copolymers are also disclosed , along with methods for drug delivery and for preventing the formation of adhesions between injured tissues employing the random block copolymers . polyarylate random block copolymers are also described .