Complex-radical copolymerization of vinylcyclohexyl ketones with

maleic anhydride and N-p-tolylmaleimide

Zakir M.O. Rzaev1a,Güneri Akovali1, E.Yu. Kuliyeva2 and N.Yu. Lezgiev2

1 Departments of Chemistry & Polymer Science and Technology, Middle East Technical University, 06531Ankara, Türkiye

1a Visiting Professor from Institute of Polymer Materials, Azerbaijan Academy of Sciences, 370001 Baku, Azerbaijan

2 Department of Chemistry, Azerbaijan Institute of Technology, Gendje-Azerbaijan

Abstract

Some features of the formation and photochemical reactions of cyclohexylketone containing macromole-culesincluding copolymers of vinylcyclohexyl ketone (VCHK) and its derivatives (V-a -Cl-CHK and V-d -C1-CHK) with maleic anhydride (MA) and N-p-tolylmaleimide (TMI) have been revealed. It has been established that keto-enol tautomerism is the only reaction realized in the vinylcyclohexylketone molecules having mobile hydrogen atom at a -position in the cyclohexane ring, enol form of which is formed by charge-transfer complexes with anhydride or imide of maleic acid as acceptor monomers. The kinetic parameters of these reactions, including complex-formation and copolymerization constants, as well as the ratios of chain growth rates for the participation of monomeric charge-transfer complexes and free monomers, are all determined. It is shown that an alternative copolymerization is realized with the monomer systems containing VCHK and V- d -C1-CHK, which are carried out through a complex-mechanism due to the keto-enol tautomerism; while random copolymer enriched with vinyl ketone units is formed with the system containing oc-ubstituted VCHK. It is found that characteristics of photochemical reactions of alternating copolymer synthesized depend on the type of substitution in the vinyl ketone molecule; unlink VCHK-MA(TMI) and V-d -Cl-CHK-MA(TMI) copolymers case which easily crosslink upon UV-irradiation, and the N-substituted derivatives of these copolymers which decompose under similar condition.