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Title: Effect of Carbon Nanofibers on the Viscoelastic Response of Epoxy Resins
Authors: Santos, Paulo
Silva, Abílio P.
Reis, Paulo N. B. 
Keywords: epoxy resin; carbon nanofibers; mechanical testing; stress relaxation; creep
Issue Date: 7-Feb-2023
Publisher: MDPI
Project: UIDB/00155/2020 
Serial title, monograph or event: Polymers
Volume: 15
Issue: 4
Abstract: Two epoxy resins with different viscosities were enhanced up to 1 wt.%, applying a simple method with carbon nanofibers (CNFs). These were characterized in terms of static bending stress, stress relaxation, and creep tests. In bending, the contents of 0.5 wt.% and 0.75 wt.% of CNFs on Ebalta and Sicomin epoxies, respectively, promote higher relative bending stress (above 11.5% for both) and elastic modulus (13.1% for Sicomin and 16.2% for Ebalta). This highest bending stress and modulus occurs for the lower viscosity resin (Ebalta) due to its interfacial strength and dispersibility of the fillers. Creep behaviour and stress relaxation for three stress levels (20, 50, and 80 MPa) show the benefits obtained with the addition of CNFs, which act as a network that contributes to the immobility of the polymer chains. A long-term experiment of up to 100 h was successfully applied to fit the Kohlrausch-Williams-Watts (KWW) and Findley models to stress relaxation and creep behaviour with very good accuracy.
ISSN: 2073-4360
DOI: 10.3390/polym15040821
Rights: openAccess
Appears in Collections:FCTUC Eng.Mecânica - Artigos em Revistas Internacionais
I&D CEMMPRE - Artigos em Revistas Internacionais

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