Photo-crosslinkable elastomers were synthesized by addition of photo-sensitive alcohols to the alkylsuccinic ring of liquid natural rubber (LNR) and synthetic liquid 1,4-polyisoprene (LIR) was modified for the first time by reaction with maleic anhydride. Two reagents were used: 2-hydroxyethyl cinnamate (HEC) and 2-hydroxyethyl acrylate (HEA). The fixation proceeded by succinic ring opening by the action of the alcohol function of the photo-reactive molecule and led to a hemi-ester adduct. At moderate temperature (about 70 degree C), the reaction on succinic anhydride functions of maleinisated LIR was fast and quantitative when it was catalysed by pyridinen of thae alcohol function of theo phoot-reactive molecule and led to a hemi-eser adduct. AT moderate temperature (about 70 degree C), the reaction on succinic anhydirde functions of maleinisated LIR was fast and quantitative when it was catalysed by pyridine and led to polymers which were completely soluble in organic solvents. On the other hand, under the same conditions, yield of HEC addition on succinic rings of maleinisated LNR were less significant (- 60;) than on maleinisated LIR, and in the case of the acrylate reagent, the reaction was affected by the formation of gel structures. The relationship between the polymer structure and its photo-sensitivity is presented. the effects of photo-reactive group contents on the photo-corsslinking kinetics were ivestigated for each category of prepared polymers. Flexible films with good adherence on metal were prepared by using formulations including LIR or LNR carrying cinnamate groups.