Transparent and heat-resistant poly(methyl methacrylate) copolymers were synthesized by bulk polymerizing methyl methacrylate (MMA), isobornyl methacrylate (IBMA), and methacrylamide (MAA) monomers. Copolymerization was performed using a chain transfer agent to investigate the molecular weight changes of these copolymers, which exhibited advantages including a low molecular weight distribution,...

The evidence for the existence of a light and broad resonance in I=J=0 ππ scattering process – named as the σ resonance – has been accumulated, and more and more physicists working on the subject accepted the renaissance of the σ resonance. Among those works, model independent analysis 1), 2) are vital in clarifying the issue whether the σ resonance exists or not, since one has to distinguish a...