Published results also suggest that the nanocomposites
degrade faster than the neat polymers [11, 12]. This relative susceptibility of nanocomposites to UV light ageing could
constitute a major drawback for the outdoor applications.
Several hypotheses were suggested in order to explain this
instability: adsorption of additives onto the clay, catalytic
effect of impurities on the organoclay or the presence of
iron ions in the montmorillonite structure as well as the
degradation of the alkyl ammonium cations of MMT [13].