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Some peculiarities in the radical copolymerization of trans-allyl cinnamate, a bifunctional monomer containing donor (allyl) and acceptor (cinnamic) double bonds in the molecule, with styrene in methyl ethyl ketone, at 60 "C, using 2,2'-azobis(isobutyroniti1e) as the initiator have been revealed. Kinetic parameters of copolymerization such as complex formation, cyclization, and copolymerization constants and ratios of chain growth rates for the participation of monomeric charge transfer complexes (CTC) and free monomers are all determined. The results show that an alternative copolymerization reaction is realized which is carried out via a "mixed" mechanism with formation of macromolecules of unsaturated cyclolinear structures. It has been established that the chain growth proceeds predominantly through the reaction of cinnamic macroradicals with CTC and free styrene monomer. It has been proved that obtained copolymer is highly sensitive to UV-irradiation, E-beams. and X-rays, providing high lithographic parameters and plasmastability for its negative resists

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