Reactions de condensation interpolymeriques a l'etat fondu

Condensation reactions between the anhydride groups of a copolymer containing maleic anhydride links and OH groups on different molecules were carried out in a plastograph, the copolymer being in the molten state. If dihydroxylated molecules or even telomers were used, the progress of reaction is easily followed by the rising of the consistency of the melt. The ester bridges formed between two copolymer molecules may be disrupted by methanolic transesterification in basic solution. Study of the reactivity of a series of monohydroxylated polymers of increasing DP showed that the compatibility of these hydroxylated polymers with maleic anhydride copolymer in the molten state is of outstanding importance for a good yield.