On the matrix-particle interphase in epoxy-based composites

Tognana, S.; Salgueiro, W.; Somoza, A.

doi:10.1016/j.jallcom.2009.10.058

Cited by 7 publications

(13 citation statements)

References 15 publications

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“…PALS In Figure 1, the variation of the average free nanohole volume as a function of the filler volume fraction is shown. Though these data were already published in a previous work [13], in order to facilitate the reading and put major emphasis in the key issues of the present work, we decided to present them and to give a brief analysis of the experimental data again. As can be seen, there is a complex and non-monotonic behavior of V H when # increases.…”

Section: 2mentioning

confidence: 99%

“…To go further into the analysis of the data presented in Figure 1 and taking as a starting point the previous work of Goyanes et al [8] and Tognana et al [13], it was necessary to obtain additional experimental evidences. Besides, a deeper analysis of the data using well-known micromechanical models was carried out.…”

Section: 2mentioning

confidence: 99%

“…This parameter is defined by Equation (12): (12) Besides, the factor ' depends on the maximum packing fraction # m of the filler. ' can be obtained by using an empirical function as given by Equation (13): (13) where the factor # m was taken from the literature # m = 0.637 ( [22]). This parameter is independent of the materials forming the composite.…”

Section: Young's Modulus Variation Due To Fillermentioning

confidence: 99%

“…However, it is difficult to find a proper technique that allows the study of both processes at the same time. Some of the authors of the present work have studied the influence of the residual stresses on the free volume in polymer-matrix composites, taking advantage of the high specificity of Positron Annihilation Lifetime Spectroscopy (PALS) [8,12,13]. PALS is practically the only experimental technique that allows to directly measure the size of nanohole forming the free volume [14].…”

Section: Introductionmentioning

confidence: 99%

“…However, the results obtained in those materials cannot be directly linked with the phenomena studied in the present work. In this work, we go deeper into the analysis of experimental PALS results we reported in [13] on the variation of the free nanohole volume in particulate epoxy matrix as a function of the aluminum particles content. As a result, it was found that the free volume depends on the thermal residual stresses and the interphase formation in the fabricated composites containing different filler contents (from the blank epoxy resin to 30%).…”

Section: Introductionmentioning

confidence: 99%

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Influence of the filler content on the free nanohole volume in epoxy-based composites

Tognana¹,

Salgueiro²,

Somoza³

et al. 2013

Express Polym. Lett.

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Abstract.A study on free nanohole volumes in particulate epoxy matrix composites as a function of the aluminum particles content is presented. Specifically, the influence of the filler content in the epoxy matrix on the nanohole volume is analyzed in terms of the mechanical and morphological properties of the composites fabricated. Nanoholes data were measured using positron annihilation lifetime spectroscopy recently published by the authors. Applying the Park-Earmme micromechanical model, these data are interpreted in terms of the thermal stresses generated during the curing process applied during fabrication. Some input parameters of the model were experimentally obtained. In order to obtain a satisfactory description of the evolution of the free nanohole volume in the whole range of filler contents, a contribution due to the matrix-particle interphases is taken into account in the micromechanical model. To this aim, specific information on the interphases was obtained using atomic force microscopy (AFM), scanning electron microscopy (SEM), differencital scanning calorimetry (DSC) and a free-constraint analysis of the positron lifetime data.

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Section: 2mentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

Section: Young's Modulus Variation Due To Fillermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of the filler content on the free nanohole volume in epoxy-based composites

Tognana¹,

Salgueiro²,

Somoza³

et al. 2013

Express Polym. Lett.

Self Cite

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Effects of Carbon Nanoreinforcements of Different Shapes on the Mechanical Properties of Epoxy‐Based Nanocomposites

Alishahi

Shadlou

Doagou-R

et al. 2012

Macro Materials & Eng

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The effect of carbon nanoreinforcements of different shapes on the mechanical properties of epoxy‐based composites is studied. It is found that while nanodiamond and fibrous (carbon nanotube and nanofiber) particles provided better tensile properties, platelet (graphene oxide) nanoreinforcements lead to a considerable increase in the fracture toughness of the composites. The trend of the results is explained on the basis of the geometrical characteristics of the reinforcements. The accuracy of several micromechanics‐based criteria for predicting the Young's modulus of composites is investigated for different nanoparticle shapes. The state of dispersion of nanofillers and the fracture surface features of all composites are examined using TEM and SEM.

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Influence of the cure temperature and the accelerator content on the free volume in a DGEBA epoxy‐anhydride‐imidazole system

Tognana

Salgueiro

Somoza

2009

Phys. Status Solidi (c)

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A PALS study on an epoxy‐anhydride system cured in presence of the accelerator imidazole was carried out. The rate of the curing reaction was changed, modifying in this way the final structure of the samples. Specifically, the parameters cure temperature and accelerator content were modified. From the calorimetric scans, the glass transition temperature of each sample was determined. The results obtained using both techniques are jointly discussed. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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On the matrix-particle interphase in epoxy-based composites

Cited by 7 publications

References 15 publications

Influence of the filler content on the free nanohole volume in epoxy-based composites

Influence of the filler content on the free nanohole volume in epoxy-based composites

Effects of Carbon Nanoreinforcements of Different Shapes on the Mechanical Properties of Epoxy‐Based Nanocomposites

Influence of the cure temperature and the accelerator content on the free volume in a DGEBA epoxy‐anhydride‐imidazole system

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