In situ stabilized carbon nanofiber (CNF) reinforced epoxy nanocomposites

Abstract

Carbon nanofibers (CNFs) suspended epoxy resin nanocomposites and the corresponding polymer nanocomposites are fabricated. The surface of CNFs is introduced a functional amine terminated groups via silanization, which in situ react with epoxy monomers. This in situ reaction favors the CNFs dispersion and improves the interfacial interaction between CNFs and monomers. Effects of particle loading, surface treatment and operating temperatures of rheological tests on the complex viscosity, storage modulus and loss modulus are systematically studied. Unique rheological phenomena ''a decreased viscosity with a better dispersion'' are observed and explained in terms of the improved filler dispersion quality. Meanwhile, significant increase in the tensile property and storage modulus is observed and related to the better dispersion and the introduced strong interfacial interaction as revealed by SEM imaging. Finally, electrical conductivity is investigated and an unusual deficiency of surface treatment to improve the electrical conductivity is explained by an insulating coating layer.

Magnetic epoxy nanocomposites with superparamagnetic MnFe2O4 nanoparticles

“…However, the a little improvement of T g in the epoxy nanocomposites with 1.0 wt% MnFe 2 O 4 loading, is attributed to the well dispersed MnFe 2 O 4 nanoparticles in the epoxy resin, which restricts the mobility of the main chains of the polymer. 46 The similar effect of nanoparticles loadings on the stability of nanocomposites was also observed in the DSC section in Fig. 3 and Table III. The loss factor (tan δ) is the ratio of the lost energy to total vibrational energy during a vibrational time in a cycle.…”

“…However, epoxy is still lack of some kind of properties, such as low mechanical properties, flammability, magnetism, high permittivity, dielectric properties and so on, if it is supposed to be applied in industry areas. In order to improve the mechanical properties and introduce some new functionalities, for example, electrical conductivity, optical and magnetic properties, a variety of nanoparticles including carbon nanomaterials, [46][47][48][49][50] iron and iron oxide nanoparticles, 51,52 nanoclay 53 and organic nanoparticles 54,55 have been used to modify epoxy. However, it is common that the introduced multifunctional inorganic fillers would decrease the mechanical properties owning to the aggregate of the fillers in polymer matrix, which would lead to poor interfacial adhesion between the fillers and polymer matrix, 47 especially at high loading of fillers (>5.0 wt%), the mechanical properties dramatically dropped due to the aggregation of nanofillers.…”

A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

“…The electrical conductivity enhancement appears in three main stages, (i) prior to, (ii) within, and (iii) after percolation threshold [313][314][315]. Figure 16 [316] shows the three steps for carbon fibers into a polymer host, respectively.…”

Multifunctional Nanofibers towards Active Biomedical Therapeutics

“…Nanofibers have found applications especially in biomedical [1], self-cleaning [2], reinforcement composites [3][4][5][6], sensing [7][8][9], and energy devices [10]. In this review, we mainly focus on detailing the requirements, strategies, and up-to-date developments of biomedical applications of nanofibers in tissue engineering, drug delivery, and wound dressing.…”