Abstract
Viscosity data relative to samples of Nylon 6 and of the same polymer in the presence of various amounts of lithium chloride subjected to UV irradiation in air for various lengths of time are reported. These data, as well as the derived results of the number of broken bonds per molecule, clearly demonstrate the coexistence of chain scission and crosslinking processes. They also show that the presence of the salt influences only the photo-oxidation kinetics, which is increased, in spite of the reinforcing of the amide bonds, because of the lower degree of crystallinity. On the phenomenological side, the results can be correlated with the hypothesis that scission and crosslinking occur simultaneously, through a first-order reaction.
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