= Poly(methyl methacrylate)
= PMMA
{c}
{synonym}
<Poly(methyl methacrylate)> is a <thermoplastic> <polymer> with repeating units $\mathrm{-CH_2-C(CH_3)(COOCH_3)-}$. The carbon backbone bears methyl and ester side groups, which distinguish it from a simple hydrocarbon polymer.
In <electron beam lithography>, suitably prepared material can act as a positive-tone resist: exposure changes the polymer so that the exposed region dissolves more readily during development. This application depends on molecular degradation and processing conditions as well as on the repeat-unit identity.<Organic Chemistry by John McMurry/31.1 Chain-Growth Polymers>[Chain-growth polymerization and substituted vinyl monomers]{ref}
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