Effect of silica content on thermal stability of fumed silica/epoxy composites

Tarrío-Saavedra, Javier; López-Beceiro, Jorge; Naya, Salvador; Artiaga, Ramón

doi:10.1016/j.polymdegradstab.2008.08.006

Cited by 109 publications

(54 citation statements)

References 33 publications

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“…The T g of the cured samples was also determined by DSC in standard mode, although in this case a 10°C·min -1 cooling ramp from 110 to 0°C was used. A previous thermal stability study of these composites [26] It has been performed a TEM analysis for studying the distribution of particle sizes and dispersion with a greater magnification. TEM analysis has been realized in a transmission electron microscope JEM-1010 (JEOL, Tokyo, Japan).…”

Section: Characterization Methodsmentioning

confidence: 99%

“…On other hand, thermal analysis techniques are usually employed in the study of thermal stability, curing reactions, glass transition and thermomechanical properties. Thermal stability of polymers and composites is usually evaluated by thermo-gravimetric analysis (TG) [10,26]. Differential scanning calorimetry (DSC) has been used to study the degree of curing of thermosets by calculating the heat of cure from the area enclosed in the exothermal peak [10,18,27].…”

Section: Introductionmentioning

confidence: 99%

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Controversial effects of fumed silica on the curing and thermomechanical properties of epoxy composites

Tarrío-Saavedra

López-Beceiro²,

Naya³

et al. 2010

Express Polym. Lett.

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Abstract. The effect of fumed silica on the curing of a trimethylolpropane epoxy resin was investigated by thermal analysis methods like Differential Scanning Calorimetry (DSC), and Dynamic Mechanical Analysis (DMA). The fumed silica used here is a by-product of the silicon and ferrosilicon industry, consisting of micro and nanosized particles. Both the curing reaction and the properties of the obtained composites were affected by the filler content. Different trends were observed for filler contents above and below the 30 wt%. Up to 30 wt%, the behaviour can be explained as a predominantly agglomeration effect. For 30 wt% and higher filler contents, single particles seem to play a more important role.

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Section: Characterization Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controversial effects of fumed silica on the curing and thermomechanical properties of epoxy composites

Tarrío-Saavedra

López-Beceiro²,

Naya³

et al. 2010

Express Polym. Lett.

Self Cite

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“…For high solid loading content, this trend may reveal increasing difficulty in removing decomposed volatiles because of the formation of a char layer or particle impediment as the solid loading increases for PIM feedstock. This issue has been extensively studied for systems in which the solid content is relatively low (up to 50 vol.%), especially in epoxy resins that are thermally stabilised with fillers [8,9]. In such cases, many works attribute this decrease in the slope to the formation of a char layer, which contributes to the polymer thermal stability.…”

Section: Thermal Degradation Of Binder In Nmentioning

confidence: 99%

Thermal stability and degradation kinetics of feedstocks for powder injection moulding – A new way to determine optimal solid loading?

Hidalgo

Jiménez-Morales

Torralba

2013

Polymer Degradation and Stability

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Degradation kinetics and the thermal stability of zircon powder injection moulding feedstocks (PIM) based on cellulose acetate butyrate (CAB) and polyethylene glycol (PEG) binders were investigated using simultaneous thermogravimetric analysis (STA). The initial decomposition temperature (IDT) and the integral procedure decomposition temperature (IPDT) were used to analyse the thermal stability of the binder system as a function of the solid loading content. The degradation kinetics was studied, and the degradation activation energy was assessed for varying zircon powder contents using isoconversional methods. All the methodologies revealed changes in the thermal degradation behaviours of the feed-stocks for solid loadings that were previously determined to correspond to optimal solid loadings using other experimental procedures. These results may promote the proposal of thermodynamic degradation studies of feedstocks as an alternative or complementary technique to determine optimal solid loading contents in powder injection moulding (PIM). The studies in this paper also examined PIM process operation temperatures for zircon feedstocks.

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“…Thermal stability factors, including initial decomposing temper- ature (the temperature of 5% weight loss, T d5 ) and statistic heat-resistant index temperature (T s ), can be determined from TGA thermograms. 13,[16][17][18][19][20][21] The T s was calculated from the T d5 and the temperature of 30% weight loss (T d30 ) values according to the following equation. [18][19][20][21] (1)…”

Section: Resultsmentioning

confidence: 99%

Thermal stability and impact and flexural properties of epoxy resins/epoxidized castor oil/nano-CaCO3 ternary systems

2010

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Epoxy ternary systems were prepared from the diglycidylether of bisphenol-A (DGEBA), epoxidized castor oil (ECO), and nano-CaCO 3 using a thermally latent initiator. The effects of ECO and the nano-CaCO 3 contents on the thermal stability and mechanical interfacial properties of the prepared DGEBA/ECO/nano-CaCO 3 ternary systems were examined by thermogravimetric analysis (TGA), Izod impact tests, and mechanical tests. The morphology of the ternary systems was examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The statistic heat-resistant index temperature (T s ) of the ternary systems was approximately constant up to 30 wt% ECO, and thereafter decreased with increasing ECO content. The impact strength of the ternary systems was improved by the addition of ECO and nano-CaCO 3 . The flexural strength of the ternary systems exhibited a maximum value at 20 wt% ECO. SEM showed that shear deformation occurred, which prevented the propagation of cracks in the DGEBA/ECO/nano-CaCO 3 ternary systems.

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Effect of silica content on thermal stability of fumed silica/epoxy composites

Cited by 109 publications

References 33 publications

Controversial effects of fumed silica on the curing and thermomechanical properties of epoxy composites

Controversial effects of fumed silica on the curing and thermomechanical properties of epoxy composites

Thermal stability and degradation kinetics of feedstocks for powder injection moulding – A new way to determine optimal solid loading?

Thermal stability and impact and flexural properties of epoxy resins/epoxidized castor oil/nano-CaCO3 ternary systems

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