Synthesis and polymerization of lignin macromonomers. II. Effects of lignin fragments on methyl methacrylate radical polymerization
| Autor: | C. Da Cunha, M. Fontanille, Alain Deffieux |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Polymers and Plastics
Radical fungi Radical polymerization technology industry and agriculture food and beverages Chain transfer Solution polymerization macromolecular substances General Chemistry complex mixtures Surfaces Coatings and Films chemistry.chemical_compound chemistry Polymerization Polymer chemistry Materials Chemistry Lignin Organic chemistry Reversible addition−fragmentation chain-transfer polymerization Ionic polymerization |
| Zdroj: | Journal of Applied Polymer Science. 44:1205-1212 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/app.1992.070440710 |
| Popis: | The effect of lignin fragments and acetylated lignin ones on the radical polymerization of methyl methacrylate was investigated. Kinetics show that lignin moieties act first as inhibitors of the MMA polymerization. The inhibition process has been attributed to the phenolic groups, which primarily react through hydrogen transfer with free radicals issued from benzoyl peroxide dissociation, thus leading to a series of lignin free radicals inactive towards ethylenic groups. The derivatization of lignin hydroxyl groups into ester groups totally suppresses the inhibition. It is shown that both lignin and acetylated lignin act as chain limiting agents towards MMA polymerization. |
| Databáze: | OpenAIRE |
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