Synthesis of maleimide-terminated n-butyl acrylate oligomers by atom transfer radical polymerization: Study of their copolymerization with vinyl ethers
Résumé
The synthesis of maleimide (aliph. or arom.) terminated poly(Bu acrylate) oligomers based on the ATRP method was developed. The oligomers with an arom. maleimide-terminated function were obtained, starting from an initiator bearing an arom. nitro function. The nitro function was then reduced and the imidization of the obtained amine function gave the expected maleimide-terminated oligomers. To obtain oligomers with an aliph. maleimide function, a new initiator with an aliph. amine function was used for the ATRP step. Because of its high reactivity, it was necessary to protect the amine function by a boc group to avoid side reactions. After the ATRP reaction, the cleavage of the t-boc group by an acid treatment gave the aliph. amine functionalized oligomer. The last step of imidization gave the corresponding maleimide-terminated oligomer. The obtained maleimide-terminated oligomers were copolymd. with divinyl ether under UV irradn. with or without photoinitiator. The FT-IR study of these copolymns. showed a really higher reactivity of the aliph. maleimide. The addn. of Darocur as photoinitiator with the arom. maleimide was necessary to make this system enough crosslinked. The photopolymn. mechanism was detd. to be a homopolymn. of an acceptor/ donor complex.