The structure of submicron polyethylene/silica composite particles

Autor: Rafail Khalfin, C. Makarov, Yachin Cohen, Hila Elimelech, Hanan Sertchook, David Avnir, Vadim Makarov
Rok vydání: 2007
Předmět:
Zdroj: Polymers for Advanced Technologies. 18:712-719
ISSN: 1099-1581
1042-7147
Popis: A novel method for a one-step preparation of silica/low-density polyethylene (LDPE) composite particles has been developed recently, based on performing sol–gel polycondensation within an emulsion of LDPE dissolved in xylene and tetraethyl othosilicate which is stabilized by poly (ethylene-block-ethylene glycol) block copolymer surfactant (PBP), all dispersed in a basic ethanolic medium. The particle dimensions are in the sub-micron range with diameters of 200–500 nm. Small-angle X-ray scattering (SAXS) measurements with contrast variation, in conjunction with other characterization methods, provide information on the inner structure of the nanoparticle's composition and inhomogeneity, which has a characteristic dimension of about 7 nm. Increase in the PBP amount and the presence of LDPE result in decrease in volume fraction of voids. The surface of the particles is heavily coated with the organic material. The crystallinity and melting behavior of LDPE is unaffected by its confinement to the particles. Copyright © 2007 John Wiley & Sons, Ltd.
Databáze: OpenAIRE
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