2-Propenoic acid, 2-methyl-, polymer with cyclohexyl 2-methyl-2-propenoate, methyl 2-methyl-2-propenoate and phenylmethyl 2-methyl-2-propenoate, 2,2'-(1,2-diazenediyl)bis[4-methoxy-2,4-dimethylpentanenitrile]-initiated