Free-radical transport from latex particles
| Autor: | R. N. Mead, Gary W. Poehlein |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Quantitative Biology::Biomolecules
Polymers and Plastics Radical Diffusion Thermodynamics Emulsion polymerization General Chemistry Thermal diffusivity Surfaces Coatings and Films Condensed Matter::Soft Condensed Matter chemistry.chemical_compound Reaction rate constant Monomer chemistry Desorption Polymer chemistry Materials Chemistry Particle Physics::Chemical Physics |
| Zdroj: | Journal of Applied Polymer Science. 38:105-122 |
| ISSN: | 1097-4628 0021-8995 |
| Popis: | A rate constant for the diffusion of monomer radicals from latex particles is derived using the transport equations describing the generation, diffusion, and reaction of monomer radicals within the particles. Calculations for styrene emulsion polymerization show that this “desorption constant” accounts for nonuniform distribution of monomer radicals within the particle while some previously published theories do not. The difference in the desorption constant calculated with the model derived in this work and the “uniform concentration” models could be an order of magnitude when diffusivity of monomer radicals in the particles is small. The monomer radical transport theory is extended to emulsion copolymerization. Desorption rate constants accounting for nonuniform distribution of monomer radicals are derived for emulsion copolymerization. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text