COPOLYMERIZATION OF 2-ACRYLAMIDO-2-METHYLPROPANE SULFONIC-ACID WITH 2-HYDROPROPYL METHACRYLATE

Copolymerization of 2-acrylamido-2-methylpropane sulfonic acid (AMPS, monomer 1) with 2-hydropropyl methacrylate (monomer 2) was conducted i n pure water at 80 degrees C. The reactivity ratios estimated from the compositional data of the copolymers at low conversion are r(1)=0.04/-0.04 and r(2)=6.30+/-0.48, and values of Q(1) and e(1) are 0.16 and 1.37, respectively. Copolymer microstructure predicted by statistical calculation shows mean sequence length of M(1) shorter than 2. These r esults can be attributed to the strong repulsion between the ionized c hain radical and charged monomer of AMPS.