An Equilibrium Model for Diffusion-Limited Solid-State Polycondensation
| Autor: | Douglas J. Kiserow, Joseph M. DeSimone, George W. Roberts, Michael D. Goodner |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Bisphenol A Ethylene Condensation polymer General Chemical Engineering Diffusion Thermodynamics General Chemistry Polymer Industrial and Manufacturing Engineering chemistry.chemical_compound chemistry Polymerization visual_art Polymer chemistry visual_art.visual_art_medium Particle size Polycarbonate |
| Zdroj: | Industrial & Engineering Chemistry Research. 39:2797-2806 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie990648o |
| Popis: | A model for unsteady-state solid-state polycondensation (SSP) is developed and is applied to the polymerization of poly(bisphenol A carbonate) and poly(ethylene terephthalate) (PET). The model assumes that diffusion of the reaction condensate in the solid polymer is the rate-limiting step in the overall polymerization kinetics. Therefore, the reversible polycondensation reaction is at local equilibrium throughout the polymer particle at all times. The model is applicable to the three general types of step-growth polymerization: AB, A2, and A2 + B2 polycondensation. Through comparison with the predictions of a full kinetic model for polycarbonate synthesis, it is demonstrated that the equilibrium model provides an upper bound on molecular weight and its rate of increase. Model predictions are also compared to experimental data for PET SSP. These comparisons show that the equilibrium model provides a useful tool for understanding the effects of temperature and particle size as well as for establishing a lo... |
| Databáze: | OpenAIRE |
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