The invention discloses thermoassociative and exchangeable copolymers, and compositions comprising same. According to the invention, the invention relates to a composition resulting from the mixture of at least one copolymer A1 resulting from the copolymerisation of at least one monomer functionalised by diol functions and at least one compound A2 comprising at last two boronic ester functions. They have rheological properties which are very varied according to the proportion of the A1 and A2 compounds used. The field of the invention is that of associative and exchangeable polymers.