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The effects of electronic excitations due to irradiation of electrons or energetic heavy ion (>1 MeV/amu) irradiations on Linear polymers of general formula -(CR1R2-CR3R4)n- are reviewed and compared with previous results obtained with γ and electron irradiation. The polymer modification are discussed accounting for the nature and the position of the R1, R2, R3 and R4 substituents on the main chain. It is suggested that Linear polymers evolve according to the "R" can nature (R=R1, R2, R3, R4).

This paper includes the physical and chemical processes of electronic excitation and the mechanisms which Lead to modification of the macromolecules.

An attempt is made to relate the macromolecular structure of polymers and their structural modifications under irradiation.

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