2026-04-17T02:47:50Zhttps://recercat.cat/oai/request
oai:recercat.cat:2072/4731642024-11-04T07:11:11Zcom_2072_98col_2072_378192
RECERCAT author Martos, Alba author Sebastián Pérez, Rosa Maria author Marquet, Jordi 2024-11-04T07:11:11Z 2024-11-04T07:11:11Z 2018 http://hdl.handle.net/2072/473164 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. open access Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. https://creativecommons.org/licenses/by-nc-nd/4.0/ Mechanism of polymerization Phenolic resins Polybenzoxazines Polymerization temperature Substituent effects Studies on the ring-opening polymerization of benzoxazines : Understanding the effect of the substituents Article