Abstract
The polymerization and crosslinking reaction mechanisms were studied for the emulsion polymerization of chloroprene. The dependence of volume of monomer droplet, surface-tension and crosslinking density on conversion was confirmed to be corresponding to the Harkins and Smith-Ewart models. Crosslinking densities were estimated from swelling ratios of the gel polymers prepared at various temperatures in the absence of a chain transfer reagent. The ratios of the rate constant of the propagation to the crosslinking K were calculated to be 2.0×10−4, 7.1×10−4, and 9.9×10−4 at 10, 40, and 55°C, respectively. The difference between activation energies of these two mechanisms was 27.8 kJ mol−1. The proportions of polymer in the growing polymer particles during the existence of monomer droplets θ′ were also caluculated to be 0.47, 0.45, and 0.42, at each temperature.
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Itoyama, K., Hirashima, N., Hirano, J. et al. Emulsion Polymerization of Chloroprene. Polymerization Mechanism and Evaluation of Crosslinking Density. Polym J 23, 859–864 (1991). https://doi.org/10.1295/polymj.23.859
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DOI: https://doi.org/10.1295/polymj.23.859