Abstract
The effect of alkyl substituents on the stability and degradation products of alkyl methacrylate polymers has been explained in terms of ASED-MO theory. The calculations explained that the formation of methyl, ethyl, n-propyl, and n-butyl methacrylate monomers as the principal products during the thermal degradation of their polymers is due to their high stabilities, which probably correspond to the high energy separation between HOMO-LUMO levels. However, the t-butyl methacrylate monomer shows the smallest energy separation, which increases its tendency towards the ester decomposition mechanism during the thermal degradation of poly( t-butyl methacrylate).
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