Poly(methacrylic acid) Standard (Mw 20,000);Poly(methacrylic acid) Standard (Mw 40,000);Poly(methacrylic acid) Standard (Mw 80,000);Poly(methacrylic acid) Standard (Mw 120,000);Poly(methacrylic acid) Standard (Mw 180,000);Poly(methacrylic acid) Standard (Mw 250,000);Poly(methacrylic acid) Standard (Mw 350,000);2-methyl-2-propenoicacihomopolymer