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Poly(methyl methacrylate) dispersions in decane stabilized by a diblock copolymer
Author(s) -
Stejskal Jaroslav,
Kratochvíl Pavel
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920580119
Subject(s) - dispersion polymerization , molar mass , materials science , methyl methacrylate , polymer chemistry , copolymer , polymer , monomer , dispersion (optics) , decane , polymerization , polystyrene , chemical engineering , particle (ecology) , dynamic light scattering , composite material , chemistry , organic chemistry , nanoparticle , optics , nanotechnology , physics , oceanography , geology , engineering
In a dispersion polymerization, the monomer is miscible with the reaction medium, while the resulting polymer is insoluble under the same conditions. The macroscopic precipitation of the polymer is prevented by a steric stabilizer. Methyl methacrylate was polymerized in decane in presence of polystyrene‐ block ‐poly(ethylene‐ co ‐propylene) and spherical dispersion particles of poly(methyl methacrylate) (PMMA) were obtained. The static light scattering yielded molar masses of particles in the range 4 × 10 7 to 7 × 10 9 g mol −1 . Dynamic light scattering provided the hydrodynamic radii from 60 to 190 nm and also information on the non‐uniformity of the particles. The relations between the characteristics of the dispersion particles (concentration of components, particle mass and dimensions, molar mass of PMMA chains, surface density of stabilizing chains, etc.) were looked for. The kinetics of polymerization seems to be only little affected by the colloidal character of the system.