Controlled Free-Radical Polymerization of Phenol Derivatives by Enzyme-Catalyzed Reactions in Organic Solvents
| Autor: | Madhu S. Ayyagari, David L. Kaplan, Sukant K. Tripathy, Kenneth A. Marx, Joseph A. Akkara |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Organic Chemistry Radical polymerization Dispersity Solution polymerization Polymer Inorganic Chemistry Gel permeation chromatography chemistry.chemical_compound chemistry Polymer chemistry Materials Chemistry Molar mass distribution Dimethylformamide Solvent effects |
| Zdroj: | Macromolecules. 28:5192-5197 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma00119a005 |
| Popis: | The ability to control the molecular weight and dispersity of poly(p-ethylphenol) was demonstrated. The polymer was synthesized enzymatically in different organic solvents and a water-in-oil microemulsion. Using solubility parameters, the composition of the reaction medium was varied to study effects on the polymer yield, molecular weight, and dispersity. As a result, polymers with low dispersities and molecular weights from 1000 to 3000 could be synthesized in reversed micelles. In comparison, reactions in bulk solvents resulted in a narrow range of molecular weights (281-675). With dimethylformamide as eluent, the effect of LiBr on the molecular aggregation of poly(p-ethylphenol) was studied using gel permeation chromatography. The presence of LiBr (at ≥ 0.35 w/v %) in dimethylformamide resulted in complete dissociation of the aggregation in solution. Poly(p-ethylphenol) was functionalized at hydroxyl positions with palmitoyl and cinnamoyl groups. Structural characterization of the polymers was carried out by 13 C-NMR, UV, and FTIR spectroscopies. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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