Moisture barrier characteristics of organoclay?epoxy nanocomposites

Kim, Jang Kyo; Hu, Chugang; Woo, Ricky S.C.; Sham, Man Lung

doi:10.1016/j.compscitech.2004.10.014

Cited by 290 publications

(158 citation statements)

References 16 publications

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“…Epoxy resins are very attractive due to high strength and stiffness, high temperature resistance, low shrinkage, low volatility and etc. However, the epoxy resin absorbs high degree of moisture which in turn degrades the functional, structural and mechanical properties of the composites [11]. In our previous studies, it was found that the optimum loading of OMMT in epoxy/glass fiber nanocomposites is attained at 3 wt% [12].…”

Section: Introductionmentioning

confidence: 99%

Water absorption of epoxy/glass fiber/organo-montmorillonite nanocomposites

Chow¹

2007

Express Polym. Lett.

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Abstract. The epoxy/glass fiber/organo-montmorillonite (OMMT) nanocomposites were prepared by hand lay up method. In the previous work, the flexural and morphological properties of the epoxy/glass fiber/OMMT were studied. In this work, the epoxy nanocomposites were characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and water absorption tests. The exfoliation of OMMT in epoxy/glass fiber nanocomposites was detected by XRD. DSC results showed that the glass transition temperature (Tg) of epoxy was increased slightly in the presence of OMMT. Water uptake of epoxy was reduced by the addition of glass fiber and OMMT. The decrease of water absorption in epoxy is attributed to the increasing of tortuosity path for water penetration in the epoxy composites by the hybrid of glass fiber and OMMT.

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Section: Introductionmentioning

confidence: 99%

Water absorption of epoxy/glass fiber/organo-montmorillonite nanocomposites

Chow¹

2007

Express Polym. Lett.

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“…It consisted of a diglycidyl ether of bisphenol A (DGEBA) epoxy (MRL-A3), which was mixed with a MRL-B2 hardener (both supplied by Reno) in the ratio 100:35 by mass. The organoclay, I.30P (primary octadecylamine modified montmorillonite) of lateral dimension over 200nm [4] was used to prepare nanocomposites with clay contents of up to 5 wt%. The organoclay was dried in an oven overnight at 75°C prior to use.…”

Section: Materials and Nanocomposite Preparationmentioning

confidence: 99%

“…Layered silicates are proven to possess excellent barrier resistance against the movement of water or gas molecules and other chemicals due to their high aspect ratios [4,5]. We have an ongoing research program on the development of nanocomposites as protective coatings, adhesives and matrices for concrete structures and fibre-reinforced plastics for structural repair.…”

Section: Introductionmentioning

confidence: 99%

Environmental degradation of epoxy-organoclay nanocomposites due to UV exposure: Part II residual mechanical properties

Woo

Zhu

Leung

et al. 2008

Composites Science and Technology

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The residual mechanical properties of epoxy-organoclay nanocomposites after moisture and UV exposure have been evaluated. The flexural modulus decreased after moisture saturation, with much less extent for the nanocomposite than the neat epoxy. The tensile failure strain was significantly reduced with UV exposure time due to the embrittlement effect, and the addition of organoclay mitigated the failure strain reduction. The elastic modulus varied little with UV exposure time regardless of organoclay, because the modulus was determined by the core material which was unaffected by UV exposure. The microhardness and the modulus of the surface material determined from nanoindentation tests increased after UV exposure, with less extent in the nanocomposite than the neat epoxy due to the thinner embrittled top layer for the nanocomposite. All these observations confirmed the beneficial effects of organoclay in improving the barrier characteristics against UV exposure.

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“…Consequently, the required nanoparticle contents in polymer matrices are usually much lower as compared to micro-fillers [6]. The formation of organic-inorganic nanocomposites has shown the ability to provide simultaneous improvements in several properties including thermal stability, glass transition temperature levelling, dimensional stability, flame retardance, dielectric constant lowering and gas barrier and corrosion protection [6][7][8][9][10][11][12][13][14][15]. The degree of interaction between filler and polymer and thus the composite properties have been related to the filler-matrix interface.…”

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.

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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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Moisture barrier characteristics of organoclay?epoxy nanocomposites

Cited by 290 publications

References 16 publications

Water absorption of epoxy/glass fiber/organo-montmorillonite nanocomposites

Water absorption of epoxy/glass fiber/organo-montmorillonite nanocomposites

Environmental degradation of epoxy-organoclay nanocomposites due to UV exposure: Part II residual mechanical properties

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

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