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Multiarm star with poly(ethyleneimine) core and poly(epsilon-caprolactone) arms as modifiers of diglycidylether of bisphenol A thermosets cured by 1-methylimidazole Acebo, Cristina Fernández Francos, Xavier Ferrando Piera, Francesc Serra Albet, Maria Àngels Salla Tarragó, José María Ramis Juan, Xavier Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics Universitat Politècnica de Catalunya. TERFIQ - Grup de Termodinàmica i Fisico-Química Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers Epoxy resins Addition polymerization Star polymers Hyperbranched Epoxy resin Anionic polymerization Thermosets Resines epoxídiques Polímers Well-defined multiarm star copolymers, with hyperbranched poly(ethyleneimine) (PEI) as the core and poly(e-caprolactone) (PCL) arms with different degree of polymerization were synthesized by cationic ring-opening polymerization of e-caprolactone from a hyperbranched poly(ethyleneimine) core and used to modify diglycidylether of bisphenol A formulations cured with 1-methylimidazole as anionic initiator. The curing process was studied by dynamic scanning calorimetry (DSC) and FTIR. By rheometry the complex viscosity of the multiarm stars synthesized and the influence of their addition to the reactive mixture was analyzed in detail. The resulting materials were characterized by thermal and mechanical tests. The addition of the multiarm star to the formulation led to homogeneous materials with a slightly toughened fracture in comparison to neat DGEBA thermosets without compromising thermal characteristics. Postprint (published version) 2013-03 Article Acebo, C. [et al.]. Multiarm star with poly(ethyleneimine) core and poly(epsilon-caprolactone) arms as modifiers of diglycidylether of bisphenol A thermosets cured by 1-methylimidazole. "Reactive and functional polymers", Març 2013, vol. 73, núm. 3, p. 431-441. 1381-5148 https://hdl.handle.net/2117/19483 10.1016/j.reactfunctpolym.2012.11.007 eng http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Restricted access - publisher's policy Attribution-NonCommercial-NoDerivs 3.0 Spain 11 p. application/pdf