| Abstract: | p-Aminostyrene ( 1 , M1) and styrene (M2) were radically copolymerized at 60°C in various solvents. There is a significant solvent effect on monomer reactivity ratios, especially on r1, suggesting a specific interaction between the solvent and the polymer radical with the p-aminostyrene moiety at the terminal position. In order to clarify the solvent factor influencing the relative reactivity, the hydrogen-bond-accepting basicity of the solvent (β) was determined from enhanced UV shifts for 1 relative to N,N-dimethyl-p-aminostyrene. Regression analysis of r1 with the solvatochromic parameters revealed that β is the major factor responsible for r1-variations. |
