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Haifa, Israel

Naor H.,Hebrew University of Jerusalem | Shuster M.,Carmel Olefins Ltd. | Avnir D.,Hebrew University of Jerusalem
Journal of Sol-Gel Science and Technology | Year: 2011

Methods for the synthesis of triple-hybrid (metal, organic polymer, ceramic component) submicron particles of silver @ (polymer@silica) spheres were developed. The polymer@silica element of the hybrid was obtained by the entrapment of an organic polymer in silica, synthesized from its precursor monomers-tetraethoxysilane or sodium silicate-within O/W or W/O emulsion droplets, stabilized by a selected surfactant. This general method was developed for hydrophobic (polyethylene, PE), hydrophilic (polyethylene glycol, PEG) and amphiphilic (PE-b-PEG) polymers. The silver component, prepared from its salt, was incorporated by several methods, either simultaneously with the above polymer entrapment, or step-wise. Full characterization of these hybrids and proof of their triple nature is provided, including its pronounced antibacterial activity. The use of these particles as functional fillers for polypropylene fibers is demonstrated. © 2011 Springer Science+Business Media, LLC. Source

Carmel Olefins Ltd. and Prostat Corporation | Date: 2002-11-12

Plastic molding compounds for use in plastic extrusion operations and for use in the manufacture of molded plastic articles, plastics sheets, and films.

Carmel Olefins LTD. | Date: 1999-07-13

chemicals, namely, conductive plastic compounds for manufacturing use in the electronic, explosive and chemical industries.

Shemesh R.,Technion - Israel Institute of Technology | Shemesh R.,Carmel Olefins Ltd. | Krepker M.,Technion - Israel Institute of Technology | Nitzan N.,D.S. Smith Plastics StePac L.A. | And 2 more authors.
Postharvest Biology and Technology | Year: 2016

Roughly, one-third of the food produced globally for human consumption is lost or wasted. These losses occur at all stages of the food value chain and across all types of food. Active packaging already plays a vital role in preventing wastage and further innovation is imperative to streamlining the food supply chain. Herein, we present an antimicrobial packaging based on polyamide (Nylon 6), containing a model essential oil (carvacrol). The volatile carvacrol molecules are encapsulated with Halloysite nanotubes (HNTs), which are naturally occurring aluminosilicate. The resulting polyamide films had an outstanding in vitro antifungal properties, with a broad spectrum of inhibitory activity against a wide range of fungal molds: Alternaria alternata, Botrytis cinerea, Penicillium digitatum, Penicillium expansum and Aspergillus niger. Furthermore, the active polyamide-based plastic bags were used for fresh produce packaging and their fungicidal and/or fungistatic effects on postharvest pathogens of cherry tomatoes, lychee and grapes were investigated. These in vivo experiments have resulted in reduced decay development and significantly extended shelf life. The presented technology holds a great potential for the development of custom-made active packaging for the food and postharvest industries, in a global effort to reduce food loss and waste. © 2016 Elsevier B.V. Source

Shemesh R.,Technion - Israel Institute of Technology | Shemesh R.,Carmel Olefins Ltd. | Krepker M.,Technion - Israel Institute of Technology | Goldman D.,Technion - Israel Institute of Technology | And 5 more authors.
Polymers for Advanced Technologies | Year: 2015

Active antimicrobial packaging is a promising form of active packaging that can kill or inhibit microorganism growth in order to maintain product quality and safety. One of the most common approaches is based on the release of volatile antimicrobial agents from the packaging material such as essential oils. Due to their highly volatile nature, the challenge is to preserve the essential oils during the high-temperature melt processing of the polymer, while maintaining high antimicrobial activity for a desired shelf life. This study suggests a new approach in order to achieve this goal. Antimicrobial active films are developed based on low-density polyethylene (LDPE), organo-modified montmorillonite clays (MMT) and carvacrol (used as an essential oil model). In order to minimize carvacrol loss throughout the polymer compounding, a pre-compounding step is developed in which clay/carvacrol hybrids are produced. The hybrids exhibit a significant increase in the d-spacing of clay and enhanced thermal stability. The resulting LDPE/(clay/carvacrol) films exhibit superior and prolonged antibacterial activity against Escherichia coli and Listeria innocua, while polymer compounded with pure carvacrol loses the antibacterial properties within days. The films also present an excellent antifungal activity against Alternaria alternata, used as a model plant pathogenic fungus. Furthermore, infrared spectroscopy analysis of the LDPE/(clay/carvacrol) system displayed significantly higher carvacrol content in the film as well as a slower out-diffusion of the carvacrol molecules in comparison to LDPE/carvacrol films. Thus, these new films have a high potential for antimicrobial food packaging applications due to their long-lasting and broad-spectrum antimicrobial efficacy. Copyright © 2014 John Wiley & Sons, Ltd. Source

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