prov:value
| - Examples include: the vinyl aromatic monomers such as styrene, ??-methylstyrene, 2- and 4-vinylpyridine; ??,??-unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, and crotonic acid; ??,??-unsaturated carboxylic acid derivatives such as methyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, ethyl acrylate, butyl acrylate, iso-o
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