Effect of Carbon Nanofibers on the Viscoelastic Response of Epoxy Resins

被引:9
|
作者
Santos, Paulo [1 ]
Silva, Abilio P. [1 ]
Reis, Paulo N. B. [2 ]
机构
[1] Univ Beira Interior, Ctr Mech & Aerosp Sci & Technol C MAST, P-6201001 Covilha, Portugal
[2] Univ Coimbra, Dept Mech Engn, CEMMPRE, P-3030788 Coimbra, Portugal
关键词
epoxy resin; carbon nanofibers; mechanical testing; stress relaxation; creep; TERM CREEP-BEHAVIOR; STRESS-RELAXATION BEHAVIOR; REINFORCED POLYPROPYLENE; MECHANICAL-PROPERTIES; POLYMERIC COMPOSITES; FIBER; NANOCOMPOSITES; PERFORMANCE; NANOPARTICLES; RESISTANCE;
D O I
10.3390/polym15040821
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
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.
引用
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页数:20
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