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Angaben zur Quelle [Bearbeiten]

Autor     Sertchook H, Elimelech H, Makarov C, Khalfin R, Cohen Y, Shuster M, Babonneau F, Avnir D.
Titel    Composite particles of polyethylene @ silica.
Zeitschrift    Journal of the American Chemical Society
Ausgabe    129
Datum    January 2007
Nummer    1
Seiten    98-108
URL    http://www.ncbi.nlm.nih.gov/pubmed/17199288

Literaturverz.   

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Fußnoten    yes
Fragmente    1


Fragmente der Quelle:
[1.] Mrs/Fragment 012 05 - Diskussion
Zuletzt bearbeitet: 2015-04-19 19:06:04 WiseWoman
BauernOpfer, Fragment, Gesichtet, Mrs, SMWFragment, Schutzlevel sysop, Sertchook et al 2007

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Untersuchte Arbeit:
Seite: 12, Zeilen: 5-21
Quelle: Sertchook et al 2007
Seite(n): 98, Zeilen: abstract
Polyethylene (PE) and silica are perhaps the simplest and most common organic and inorganic polymers, respectively. Sertchook et al. [27] describe, for the first time, a physically interpenetrating nanocomposite between these two elementary polymers. While polymer-silica composites are well known, the nanometric physical blending of PE and silica has remained a challenge. A method for the preparation of such materials, which is based on the entrapment of dissolved PE in a polymerizing tetraethoxysilane (TEOS) system, has been developed. Specifically, the preparation of submicron particles of low-density PE at silica and high-density PE at silica is detailed, which is based on carrying out a silica sol-gel polycondensation process within emulsion droplets of TEOS dissolved PE, at elevated temperatures. The key to the successful preparation of this new composite has been the identification of a surfactant, PE-b- PEG, that is capable of stabilizing the emulsion and promoting the dissolution of the PE. A mechanism for the formation of the particles as well as their inner structure are proposed, based on a large battery of analyses, including transmission electron microscopy (TEM) and scanning electron microscopies (SEM), surface area and porosity analyses, various thermal analyses including thermal gravimetric analysis (TGA/DTA) and differential scanning calorimetry (DSC) measurements, small-angle X-ray scattering (SAXS) measurements and solid-state NMR spectroscopy.

[27] H.Sertchook, Hi. Elimelech, C. Makarov, R. Khalfin, Journal of the American Chemical Society. 2007, 129, 98-108

Polyethylene (PE) and silica are perhaps the simplest and most common organic and inorganic polymers, respectively. We describe, for the first time, a physically interpenetrating nanocomposite between these two elementary polymers. While polymer-silica composites are well known, the nanometric physical blending of PE and silica has remained a challenge. A method for the preparation of such materials, which is based on the entrapment of dissolved PE in a polymerizing tetraethoxysilane (TEOS) system, has been developed. Specifically, the preparation of submicron particles of low-density PE@silica and high-density PE@silica is detailed, which is based on carrying out a silica sol-gel polycondensation process within emulsion droplets of TEOS dissolved PE, at elevated temperatures. The key to the successful preparation of this new composite has been the identification of a surfactant, PE-b-PEG, that is capable of stabilizing the emulsion and promoting the dissolution of the PE. A mechanism for the formation of the particles as well as their inner structure are proposed, based on a large battery of analyses, including transmission electron microscopy (TEM) and scanning electron microscopies (SEM), surface area and porosity analyses, various thermal analyses including thermal gravimetric analysis (TGA/DTA) and differential scanning calorimetry (DSC) measurements, small-angle X-ray scattering (SAXS) measurements and solid-state NMR spectroscopy.
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