Studies on the ring-opening polymerization of benzoxazines
A wide set of differently substituted 3-phenyl-3,4-dihydro-2H-1,3-benzoxazine derivatives (models of thermosetting benzoxazine resins) were synthesized and their polymerization temperature was studied using Differential Scanning Calorimetry (DSC). The effect of the electronic properties of different...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:288093 |
| Acceso en línea: | https://ddd.uab.cat/record/288093 https://dx.doi.org/urn:doi:10.1016/j.eurpolymj.2018.08.025 |
| Access Level: | acceso abierto |
| Palabra clave: | Mechanism of polymerization Phenolic resins Polybenzoxazines Polymerization temperature Substituent effects |
| Sumario: | A wide set of differently substituted 3-phenyl-3,4-dihydro-2H-1,3-benzoxazine derivatives (models of thermosetting benzoxazine resins) were synthesized and their polymerization temperature was studied using Differential Scanning Calorimetry (DSC). The effect of the electronic properties of different substituents in different positions of the alkoxyphenyl ring on the polymerization temperature was analyzed by the Hammett equation. A non-linear Hammett plot was obtained indicating a change in the polymerization mechanism. Based on these results, different ring-opening polymerization (ROP) mechanisms are proposed to operate depending on the electronic character of the substituents. Thus, the previously unpredictable dependence of the polymerization temperature with the electronic character of the substituents in the alkoxyphenyl ring can be now understood and even advanced for future developments. |
|---|