Multifunctional allyl-terminated hyperbranched poly(ethyleneimine) as component of new thiol–ene/thiol–epoxy materials
Visualitza/Obre
10.1016/j.reactfunctpolym.2015.12.003
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/101177
Tipus de documentArticle
Data publicació2016-02
Condicions d'accésAccés obert
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
A new allyl terminated hyperbranched poly(ethyleneimine) was synthesized and characterized and then used in different proportions as multifunctional macromonomer in tetrathiol – diglycidyl ether of bisphenol A formula- tions. The curing process had a two-stage character and was composed by two click reactions: a fi rst photoin- duced thiol – ene addition followed by a thermal thiol – epoxy reaction. The thiol – ene reaction was catalyzed by a radical initiator and the thiol – epoxy curing by tertiary amines. The evolution of the fi rst part of the curing was studied by photo-DSC and FTIR and the results compared with those obtained in a photoirradiation chamber, which was used to prepare samples for thermomechanical tests. These studies showed that the thermal thiol – epoxy process prematurely began during the photoirradiation because the presence of amines in the PEI struc- ture accelerated this process. The thiol – epoxy reaction was more extensively produced when the proportion of the poly(ethyleneimine) increased in the formulation. The overlapping between both processes was greater in the photoirradiation chamber than in the photo-DSC. The intermediate material was completely cured by ther- mal treatmentin an oven.The need of adding 1-methylimidazole as catalyst to complete thethiol – epoxyreaction was derived from the calorimetric studies. The materials prepared were characterized by thermogravimetry and thermomechanical analysis.
CitacióAcebo, C., Fernandez-Francos, X., Ramis, X., Serra, À. Multifunctional allyl-terminated hyperbranched poly(ethyleneimine) as component of new thiol–ene/thiol–epoxy materials. "Reactive and functional polymers", Febrer 2016, vol. 99, p. 17-25.
ISSN1381-5148
Versió de l'editorhttp://www.sciencedirect.com/science/article/pii/S1381514815300754
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
REACT-D-15-00325R1.pdf | 1,303Mb | Visualitza/Obre |