Hybrid epoxy networks from ethoxysilyl-modified hyperbranched poly(ethyleneimine) and inorganic reactive precursors

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dc.contributor	Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics
dc.contributor	Universitat Politècnica de Catalunya. POLTEPO - Polímers Termoestables Epoxídics
dc.contributor.author	Acebo Gorostiza, Cristina
dc.contributor.author	Fernández Francos, Xavier
dc.contributor.author	Santos, Jose-Ignacio
dc.contributor.author	Messori, Massimo
dc.contributor.author	Ramis Juan, Xavier
dc.contributor.author	Serra Albet, Àngels
dc.date	2015-09-01
dc.identifier.citation	Acebo, C., Fernandez-Francos, X., Santos, J., Messori, M., Ramis, X., Serra, À. Hybrid epoxy networks from ethoxysilyl-modified hyperbranched poly(ethyleneimine) and inorganic reactive precursors. "European polymer journal", 01 Setembre 2015, vol. 70, p. 18-27.
dc.identifier.citation	0014-3057
dc.identifier.citation	10.1016/j.eurpolymj.2015.06.029
dc.identifier.uri	http://hdl.handle.net/2117/80069
dc.language.iso	eng
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject	Epoxy resins
dc.subject	Hydrolysis
dc.subject	Polymers
dc.subject	Hyperbranched polymers
dc.subject	Epoxy resin
dc.subject	Sol-gel
dc.subject	Coatings
dc.subject	Hybrids
dc.subject	Resines epoxídiques
dc.subject	Hidròlisi
dc.subject	Polímers
dc.title	Hybrid epoxy networks from ethoxysilyl-modified hyperbranched poly(ethyleneimine) and inorganic reactive precursors
dc.type	info:eu-repo/semantics/submittedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	New epoxy-silica hybrid coatings were prepared by a dual process consisting of a sol-gel process using tetraethoxysilane (TEOS) or 3-glycidyloxypropyl trimethoxysilane (GPTMS) in the presence of hyperbranched poly(ethyleneimine) with ethoxysilyl groups at the chain ends (PEI-Si) followed by a homopolymerization of diglycidylether of bisphenol A (DGEBA) using 1-methylimidazole (1-MI) as anionic initiator. The influence of the amount of TEOS and GPTMS in the characteristics of the coating was examined.; Thin transparent films were obtained and their morphology was observed by transmission electron microscopy (TEM). The hydrolytic condensation was confirmed by Si-29 NMR studies. Cage-like nanometric structures were formed in case of adding GPTMS and bigger silica particles on adding TEOS to the formulation. Thermal stability was evaluated by thermogravimetry and the scratch resistance properties were also investigated, showing an improvement in resistance to break and to detachment in all the coatings containing GPTMS. (C) 2015 Elsevier Ltd. All rights reserved.

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