Anionic Polymerization of Acrylonitrile with Trivalent Phosphorus Compounds
| Autor: | Mirna R. Estrada, Takeshi Ogawa, Nayeli Teran |
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| Rok vydání: | 2005 |
| Předmět: |
Polymers and Plastics
Chemistry Cationic polymerization Chain transfer General Chemistry Anionic addition polymerization Chain-growth polymerization Polymerization Polymer chemistry Materials Chemistry Ceramics and Composites Precipitation polymerization Ionic polymerization Living anionic polymerization |
| Zdroj: | Journal of Macromolecular Science, Part A. 42:1679-1689 |
| ISSN: | 1520-5738 1060-1325 |
| DOI: | 10.1080/10601320500246990 |
| Popis: | In order to see if the anionic polymerization of acrylonitrile initiated by trivalent phosphorous compounds is a living polymerization, and to see how high the molecular weight of polyacrylonitrile can be reached, the polymerization of acrylonitrile using triethylphosphite (TEP), phenyldiethoxyphosphine (PEP) and diphenylethoxyphosphine (DPP) was investigated. TEP was found to be a better initiator than the others, producing polymers with extremely high molecular weights. The polymerization system is a living type as the molecular weight increases until the system is exposed to air. However, the molecular weight polydispersity was in the range of 2.2–2.6 due to the complexity of initiation. The average molecular weight (Mw) reached 375,000, while that of a commercial polyacrilonitrile obtained by emulsion polymerization was 113,000. The polymer solutions obtained by the anionic polymerization became gel on standing, but they became sol when more solvent (DFM) was added and heated. The majority of polymers... |
| Databáze: | OpenAIRE |
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