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Kucukpinar E.,Fraunhofer Institute for Process Engineering and Packaging | Miesbauer O.,Fraunhofer Institute for Process Engineering and Packaging | Carmi Y.,Hanita Coatings | Fricke M.,BASF | And 8 more authors.
Energy Procedia | Year: 2015

One reason for heat losses in buildings is inadequate insulation. Vacuum Insulation Panels (VIPs) is emerging as a promising solution, being more energy efficient than conventional insulation materials, thinner and lighter. A VIP is made by placing a core insulation material inside a gas-barrier envelope and evacuating the air from inside the panel. The limitations to wide-scale VIP commercialization lie in lack of low-cost and high-volume processes to turn them into products suitable for use in buildings, and their short in-service lifetimes. These drawbacks were researched in a European funded project "Nanolnsulate", and this paper gives an overview of results. © 2015 The Authors.

Miesbauer O.,Fraunhofer Institute for Process Engineering and Packaging | Kucukpinar E.,Fraunhofer Institute for Process Engineering and Packaging | Kiese S.,Fraunhofer Institute for Process Engineering and Packaging | Carmi Y.,Hanita Coatings | And 3 more authors.
Energy and Buildings | Year: 2014

Novel cost efficient high barrier envelopes are developed for vacuum insulation panels. In order to fulfil the required maximum oxygen permeability (at 23 °C and 50% relative humidity (RH)) of 1 × 10-14 m3(STP) m-2 day-1 Pa-1 and water vapour transmission rate (at 23 °C and 85% → 0% RH) of 1 × 10-6 kg m-2 day-1, hybrid polymeric (ORMOCER®) and aluminium barrier layers are combined. Using roll-to-roll processes, these materials are deposited from the liquid or gas phase on top of a poly(ethylene terephthalate) substrate film. The low adhesion strength observed between aluminium and ORMOCER® layers is significantly increased by the deposition of an additional aluminium oxide layer between the two materials. The lamination of a polyethylene or polypropylene sealing film does not weaken the adhesion strength. The resulting barrier structure has reached an oxygen permeability of lower than 5 × 10-14 m3(STP) m-2 day-1 Pa-1 (at 37 °C and 30% RH). Electrochemical impedance spectroscopy gives evidence for a possible penetration of the ORMOCER® lacquer into the aluminium oxide layer (synergistic effect), which explains the improved adhesion and barrier performance due to the aluminium oxide layer. © 2014 Elsevier B.V. All rights reserved.

Bretler U.,Bar - Ilan University | Pellach M.,Bar - Ilan University | Fridman N.,Hanita Coatings | Margel S.,Bar - Ilan University
Colloid and Polymer Science | Year: 2014

Flame-retardant microspheres are important due to their ability to increase the thermal stability of host materials. Bromine-containing compounds have been used for centuries due to their flame-retardant properties. A problem with many currently used fire retardants is their escape from their host material, decreasing their effectiveness as well as polluting the environment. In this work, a pentabromostyrene (PBS) monomer was synthesized and polymerized by dispersion polymerization for preparation of flame-retardant microspheres. The effect of various polymerization parameters on their size and size distribution was also elucidated. In order to demonstrate the potential of poly(PBS) microspheres as flame retardants, poly(PBS)/polystyrene (poly(PBS)/PS) blends were prepared, and it was shown that the higher the percentage of poly(PBS) in the blend, the higher the combustion temperature. An additional test for the performance of the poly(PBS) microparticles as flame-retardant additives was performed by coating polyethylene terephthalate (PET) films with the poly(PBS) microspheres, decreasing their flammability, as was illustrated by a vertical burn test. The high thermal stability and low flammability of both the poly(PBS) particles and the poly(PBS)/polymer blends indicate the potential of these microspheres as flame-retardant additives. © 2014 Springer-Verlag.

Suckeveriene R.Y.,Technion IIT | Mechrez G.,Technion IIT | Filiba O.H.,Hanita Coatings | Mosheev S.,Hanita Coatings | Narkis M.,Technion IIT
Journal of Applied Polymer Science | Year: 2013

This work describes an empirical study of in situ interfacial dynamic inverse emulsion polymerization process under sonication of aniline in the presence of nine different types of carbon nanotubes (CNT) in toluene. The polymerization method described in this work is simple and very fast (5 min) compared to the other literature reports (3-12 h). During polymerization, CNT are coated with polyaniline (PANI) forming a core-shell structure of nanowires as evidenced by transmission electron microscopy (TEM) and high-resolution scanning microscopy (HRSEM). HRSEM images and surface resistivity imply that PANI coating of CNT leads to a remarkable improvement in separation and dispersion of CNT in toluene, which otherwise would have rapidly coagulate and settle. Two of the nine different CNT studied have shown the lowest surface resistivities. Films of uniform thickness were successfully produced (HRSEM of cross-sections). The effect of film thickness on conductivity and optical properties is reported in the work. © 2012 Wiley Periodicals, Inc.

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