Microstructure of polymer–clay nanocomposites studied by positrons

Wang, S.J.; Liu, L.M.; Fang, Pengfei; Chen, Zi; Wang, H.M.; Zhang, S.P.

doi:10.1016/j.radphyschem.2006.03.014

Cited by 22 publications

(10 citation statements)

References 11 publications

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“…Temperature effects have also been studied [91]. The result is that gas molecules traveling through these interfacial zones have attenuated hopping rates between free volume holes, or altered density and or size of holes, a fact which has been observed directly via the use of positron annihilation lifetime spectroscopy (PALS) [89,[102][103][104]. These theoretical considerations have been reviewed in detail [89] and some of the more widely utilized models have recently been tested experimentally over a full range (0-100 vol.%) of nanoclay filler content and modified accordingly [91].…”

Section: Permeability Of Pncsmentioning

confidence: 99%

Applications of nanotechnology in food packaging and food safety: Barrier materials, antimicrobials and sensors

Duncan

2011

Journal of Colloid and Interface Science

1,733

886

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In this article, several applications of nanomaterials in food packaging and food safety are reviewed, including: polymer/clay nanocomposites as high barrier packaging materials, silver nanoparticles as potent antimicrobial agents, and nanosensors and nanomaterial-based assays for the detection of food-relevant analytes (gasses, small organic molecules and food-borne pathogens). In addition to covering the technical aspects of these topics, the current commercial status and understanding of health implications of these technologies are also discussed. These applications were chosen because they do not involve direct addition of nanoparticles to consumed foods, and thus are more likely to be marketed to the public in the short term.

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Section: Permeability Of Pncsmentioning

confidence: 99%

Applications of nanotechnology in food packaging and food safety: Barrier materials, antimicrobials and sensors

Duncan

2011

Journal of Colloid and Interface Science

1,733

886

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“…Similar trends for I 3 have been observed for rectorite in epoxy [Wang et al, 2007a] and ethylene-co-(vinyl acetate) [Fang et al, 2006a] nanocomposites. The o-Ps lifetime is unaffected or slightly reduced, due to the increasing fraction of positrons that annihilate in the interfacial layers between silicate platelets and polymer matrix.…”

Section: Free Volume Measurements In Polymer Clay Nanocompositessupporting

confidence: 80%

“…Lifetime measurements in polymer systems like styrene-butadiene rubber (SBR) and epoxy-rectorite nanocomposite [Wang et al, 2007b] reported similar values for τ 3 but lower values for I 3 , i.e., holes of the same average size but at lower numbers. Small differences in the value of I authors for Polyamide-6.…”

Section: Pals Resultsmentioning

confidence: 99%

The use of nano-particles for the development of enhanced gas barrier polymeric coatings

Choudalakis¹,

Χουδαλάκης²

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I would like to thank prof. Stephen J. Picken and Dr. Henk Schut from the Technical University of Delft for their great hospitality and help during my staying at the Interfaculty Reactor Institute for the PALS measurements. Also, many thanks to Dr. Louise Nobel for the supply of the acrylic resin emulsion.I deeply thank prof. Josef Breu for his invitation and excellent hospitality at the University of Bayreuth in Germany. His high level scientific team and work was an important experience for me. Also many thanks to Dr. Daniel Kunz for his support and for the supply of the hectorite powder.I am gratefull to prof. Dionysios Mantzavinos of the Environmental Engineering Department for the ultrasound device. Also I thank prof. Georgios Kostakis of the Mineral Resources Engineering Department for the X-ray measurements and Ms. Maria Stratigaki for conducting the PALS measurements of the hectorite samples.I would like to deeply thank prof. Spiridon Anastasiadis, prof. Dimitrios Vlasopoulos, Dr. Emmanuel Stratakis and Mr. Lampros Papoutsakis of the University of Heraclion and Foundation of Research and Technology (F.O.R.T.H.) for the X-ray and TGA measurements and for the supply of the organo-modified montmorillonite powders. Their hospitality and willingness to help are the most obvious examples that explain why these research foundations are considered to be the best in Greece.Finally, I thank all seven members of the advisory committee for their thoughtful comments on this dissertation.xi xii

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“…However, at 7 wt% MMT loading, both τ 3 and V f decreases slightly to 1.74 ns and 73.4 Å 3 , respectively. These changes can be attributed to the presence of MMT in epoxy matrix results in the creation of additional free volume, further suggesting that the filler will not occupy the pre‐existing free volume cavities due to bigger size of the fillers but create additional free volume probably at the interface [35]. The results also suggest that the layers of the MMT will not result in much interaction between them and the epoxy and the segmental motion is not hindered, hence free volume increases.…”

Section: Resultsmentioning

confidence: 99%

Montmorillonite nanoclay filler effects on electrical conductivity, thermal and mechanical properties of epoxy‐based nanocomposites

Rashmi¹,

Renukappa²,

Ranganathaiah

et al. 2011

Polymer Engineering & Sci

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Epoxy-based nanocomposites with 2, 5, and 7 wt% of montmorillonite (MMT) nanoclay were prepared using high shear melt mixing technique. The microstructural features of the nanocomposites were investigated by transmission electron microscopy (TEM). The thermal and mechanical properties were measured using differential scanning calorimetry (DSC), thermogravimetric analyzer (TGA), and dynamic mechanical analyzer (DMA). Further, the effect of voltage, temperature, seawater aging on the electrical conductivity (r DC ) of the nanocomposites was also measured. To understand the free volume behavior upon filler loading, and to observe the connectivity between microstructure and other properties, positron annihilation lifetime spectroscopy was used. The TEM results revealed that MMT nanoparticles were uniformly dispersed in the epoxy matrix. Experimental results showed that the inclusion of 2 wt% MMT nanofiller increased the T g , electrical conductivity, thermal stability, modulus, free volume of the epoxy nanocomposite significantly. This is well explained from the results of T g (DSC and DMA), thermal stability, TGA residue, free volume analysis, and electrical conductivity.

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Microstructure of polymer–clay nanocomposites studied by positrons

Cited by 22 publications

References 11 publications

Applications of nanotechnology in food packaging and food safety: Barrier materials, antimicrobials and sensors

Applications of nanotechnology in food packaging and food safety: Barrier materials, antimicrobials and sensors

The use of nano-particles for the development of enhanced gas barrier polymeric coatings

Montmorillonite nanoclay filler effects on electrical conductivity, thermal and mechanical properties of epoxy‐based nanocomposites

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