Discussion
A small amount of hydroquinone is added to methyl methacrylate monomer in order to
Answer: C
Hydroquinone is added to inhibit polymerization.
Methyl methacrylate polymerises by free radicals, and traces of heat, light or oxygen can start it during storage. Hydroquinone and its monomethyl ether react with the radicals and stop chains from growing, so the monomer stays liquid in the drum. Before use it is removed by washing with alkali or distillation, or simply swamped with extra initiator.
It does not improve the thermal or hydrolytic stability of the polymer, and molecular weight is regulated by chain transfer agents such as mercaptans, not by inhibitors.
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