CHEMILUMINESCENCE FROM THE ISOTHERMAL OXIDATION OF SBR AND NBR ELASTOMERS

Chemiluminescence (CL) from the isothermal oxidation of SBR and NBR el astomers was measured and the results obtained were compared with thos e of FT-IR spectra and XPS. The conclusions are as follows: CL from NB R is much higher than that of SBR and the time taken to attain CLmax ( maximum CL intensity) became shorter with an increase in the amount of ED component in both elastomers. The CL,,, of the copolymers were hig her than those of the homopolymers, PBD, PST and PAN, especially for t he NBR series. PBD homopolymer oxidized easily and formed oxygenated g roups such as >C=O and -OH, and the formation of these groups in SBR a nd NBR elastomers increased with an increase in the ED component. The discrepancy between the oxidizability and CL signals observed in the S BR and NBR elastomers suggests that there are factors which increase t he CL emission through effective energy transfer from the excited stat e >C=O formed in the ED sites to the other component sites. (C) 1997 E lsevier Science Limited.