1966 Volume 39 Issue 10 Pages 2257-2260
In order to clarify the effect of the alkyl groups in alkyl acrylates (RA) on their reactivities to the attack of a radical, the copolymerization of RA (M2) with styrene (M1) has been carried out at 60°C. From the results obtained, the monomer reactivity ratios and the Q2 and e2 values were determined. It was found that the relative reactivities (1/r1) of RA to a polystyryl radical were correlated only by the polar substituent constant (σ*) of the alkyl group in RA, not by their steric substituent constant (Es) in Taft’s equation:
According to the above equation, the ρ* and δ values were obtained as 0.56 and 0, respectively. It was also observed that the Q2 and e2 values for RA were correlated by Taft’s σ* substituent constant.
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