Abstract
Radical polymerizations of polystyrene macromonomers having a methacryloyl end group, Mn of which are 2900 and 12400, were carried out in benzene and methylcyclohexane to study the solvent effect on the polymerization behavior. Radical polymerizations were done at 60°C with AIBN as an initiator under homogeneous condition. Degree of polymerization (DP), polymerization rate (Rp) and concentration of propagating radical ([M*]) were evaluated by a gel permeation chromatogtaphy (GPC) equipped with a laser light scattering detector and an electron spin resonance (ESR) spectroscopy. Intrinsic viscosity ([η]) of macromonomers and formed poly(macromonomer)s in benzene and methylcyclohexane were also measured at the polymerization temperature. It was found that both DP and Rp in methylcyclohexane were larger than those in benzene irrespective of the molecular weight of the macromonomer. From DP, Rp, and [M*], propagation rate constant (kp) and termination rate constant (kt) were evaluated. kt in methylcyclohexane was smaller than that in benzene, while kp in methylcyclohexane was nearly equal to, or slightly larger than, that in benzene. These results were considered in terms of the change in the segment density around the propagating radical site by the solvent nature.
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Tsutsumi, K., Tsukahara, Y. & Okamoto, Y. Study on the Solvent Effect on Radical Polymerization of Polystyrene Macromonomer. Polym J 26, 13–20 (1994). https://doi.org/10.1295/polymj.26.13
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DOI: https://doi.org/10.1295/polymj.26.13
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