Effect of polyaniline surface modification of carbon nanofibers on cure kinetics of epoxy resin

Movva, Siva; Chiou, Nan Rong; Guerra, Dante; Hioe, Y.; Castro, José M.; Lee, L. James

doi:10.1002/app.31656

Cited by 13 publications

(5 citation statements)

References 17 publications

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“…The catalytic effect of a carbon nanofiber was observed: the ultimate conversion and the kinetic constants in Eq. (1) increase, while the respective activation energies decrease [49]. The higher activity is exhibited by fiber whose surface is modified through the oxidative polymerization of aniline (in accordance with the authors, the "nanograssy" coating).…”

Section: Feature Of Synthesis Of Epoxy Nanocompositessupporting

confidence: 82%

Kinetic Features of Synthesis of Epoxy Nanocomposites

Иржак¹

2020

Nanorods and Nanocomposites

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Kinetic features of the formation of epoxy nanocomposites with carbon (nanotubes, graphene, and graphite), metal-containing, and aluminosilicate (montmorillonite and halloysite) fillers are considered. In contrast to linear polymers, epoxy nanocomposites are obtained only via the curing of epoxy oligomers in the presence of filler or the corresponding precursor. These additives may affect the kinetics of the process and the properties of the resulting matrix. A high reactivity of epoxy groups and a thermodynamic miscibility of epoxy oligomers with many substances make it possible to use diverse curing agents and to accomplish curing reactions under various technological conditions. The mutual effect of both a matrix and nanoparticles on the kinetics of the composite formation is discussed.

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Section: Feature Of Synthesis Of Epoxy Nanocompositessupporting

confidence: 82%

Kinetic Features of Synthesis of Epoxy Nanocomposites

Иржак¹

2020

Nanorods and Nanocomposites

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“…The influence of carbonbased nano-fillers on the enthalpies of the epoxy cure reaction is different for different nanocomposites. The addition of CNTs [19,20,31] and EG [24] decreased the "H of epoxy, whereas CNF had no pronounced effect on the heat of the TGDDM/DDS cure reaction [32] and silanized and polyaniline modified CNFs increased the "H of epoxy [33,34]. It is believed that the addition of hydroxyl-containing compounds (water, alcohols, phenols, acids) considerably promoted the interaction of epoxy compounds with amines and other nucleophilic reagents [35].…”

Section: Effects Of Gos On the Cure Reactionmentioning

confidence: 99%

Effects of graphene oxides on the cure behaviors of a tetrafunctional epoxy resin

Qiu¹,

Wang²,

Wang³

et al. 2011

Express Polym. Lett.

137

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The influence of graphene oxides (GOs) on the cure behavior and thermal stability of a tetrafunctional tetraglycidyl-4,4’-diaminodiphenylmethane cured with 4,4’-diaminodiphenylsulfone was investigated by using dynamic differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The dynamic DSC results showed that the initial reaction temperature and exothermal peak temperature decreased with the increase of GO contents. Furthermore, the addition of GO increased the enthalpy of epoxy cure reaction. Results from activation energy method showed that activation energies of GO/epoxy nanocomposites greatly decreased with the GO content in the latter stage, indicating that GOs significantly hindered the occurrence of vitrification. The oxygen functionalities, such as hydroxyl and carboxyl groups, on the surface of GOs acted as catalysts and facilitated the curing reaction and the catalytic effect increased with the GO contents. TGA results revealed that the addition of GOs decreased the thermal stability of epoxy

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“…The RIMR 135 epoxy thermal and cure kinetic parameters used in the model are given in Table . The values used in equations and are taken from Cai et al ., except the resin heat of reaction H r and activation energy Ea i , which are modified as the original values, for the given kinetic model, which resulted in drastically different cure temperatures. Using the 1D thermal model, with prescribed boundary temperatures, we employed numerical curve fitting until good laminate mid‐thickness temperatures were determined.…”

Section: Numerical Modelsmentioning

confidence: 99%

In situmeasurement using FBGs of process‐induced strains during curing of thick glass/epoxy laminate plate: experimental results and numerical modelling

et al. 2012

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For large composite structures, such as wind turbine blades, thick laminates are required to withstand large in-service loads. During the manufacture of thick laminates, one of the challenges met is avoiding process-induced shape distortions and residual stresses. In this paper, embedded fibre Bragg grating sensors are used to monitor process-induced strains during vacuum infusion of a thick glass/epoxy laminate. The measured strains are compared with predictions from a cure hardening instantaneous linear elastic (CHILE) thermomechanical numerical model where different mechanical boundary conditions are employed. The accuracy of the CHILE model in predicting process-induced internal strains, in what is essentially a viscoelastic boundary value problem, is investigated. A parametric study is furthermore performed to reveal the effect of increasing the laminate thickness. The numerical model predicts the experimental transverse strains well when a tied boundary condition at the tool/part interface is used and the tool thermal expansion is taken into account. However, the CHILE approach is shown to overestimate residual strains after demoulding because of the shortcomings of the model in considering viscoelastic effects. The process-induced strain magnitude furthermore increases when the laminate thickness was increased, owing mainly to a decrease in through-thickness internal transverse stresses.In situ process-induced strains during curing of thick laminate M. W. Nielsen et al.In situ process-induced strains during curing of thick laminate M. W. Nielsen et al.

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Effect of polyaniline surface modification of carbon nanofibers on cure kinetics of epoxy resin

Cited by 13 publications

References 17 publications

Kinetic Features of Synthesis of Epoxy Nanocomposites

Kinetic Features of Synthesis of Epoxy Nanocomposites

Effects of graphene oxides on the cure behaviors of a tetrafunctional epoxy resin

In situmeasurement using FBGs of process‐induced strains during curing of thick glass/epoxy laminate plate: experimental results and numerical modelling

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