the invention generally concerns a novel family of biocompatible surfactant copolymers having a wide range of uses , in particular in pharmaceutics and for synthesizing substances in dispersed state and for surface treatment of materials or biomaterials . said copolymers are characterised in that they comprise a hydrophobic sequence constituted by : either a homopolymer consisting of recurrent units corresponding to the general formula : in which : r 1 represents a c 1 - c 6 alkyl group or a m — coor 3 group wherein m is an integer between 1 and 5 and r 3 represents a c 1 - c 6 alkyl group ; r 2 represents a c 1 - c 6 alkyl group ; and n is an integer between 1 and 5 ; or a random copolymer consisting of different recurring units corresponding to formula as defined above ; or finally a random copolymer consisting for the major part of units corresponding to formula as defined above .