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Supercritical carbon dioxide dispers...

Horsch, Steven E.

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Supercritical carbon dioxide dispersion of nano-clays and characterization of polymer-clay nanocomposites.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Supercritical carbon dioxide dispersion of nano-clays and characterization of polymer-clay nanocomposites./
Author:	Horsch, Steven E.
Description:	145 p.
Notes:	Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 2115.
Contained By:	Dissertation Abstracts International67-04B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3213997
ISBN:	9780542658808

Supercritical carbon dioxide dispersion of nano-clays and characterization of polymer-clay nanocomposites.
Horsch, Steven E.

Supercritical carbon dioxide dispersion of nano-clays and characterization of polymer-clay nanocomposites. - 145 p.

Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 2115.

Thesis (Ph.D.)--Wayne State University, 2006.

Nanocomposites consisting of highly anisotropic layered silicates have received a great deal of attention owing to the potential for unprecedented increases in mechanical properties, barrier properties, and flame retardant properties. They key challenge is to disperse/exfoliate the layered silicates into individual sheets in order to take advantage of their large available surface area (&sim;760 m2/g). In this research, a novel supercritical carbon dioxide (scCO2) processing method was utilized to disperse nano-clays. The structure and properties of the clays and the resultant nanocomposites are characterized using a combination of wide-angle X-ray diffraction (WAXD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and rheology. Significant dispersion was achieved with Cloisite 93A clay, whereas relatively poor dispersion was achieved with Cloisite Na+ (natural clay). The extent of clay dispersion appears to be dependant on the 'CO2-philicity', which in turn depends on the surface modifications and inter gallery spacing. The presence of an acidic-hydrogen on the Cloisite 93A surface appears to play a strong role on its 'CO2-philicity'. We further demonstrate that CO2-phobic Cloisite Na+ (natural clay) can be dispersed with scCO2, using a CO2-philic polymer, polydimethylsiloxane (PDMS). The dispersed clay-PDMS nanocomposite shows an order of magnitude increase in the dynamic storage modulus at low frequencies, accompanied by the emergence of a 'solid-like' plateau, characteristic of dispersed nanocomposites with enhanced clay-polymer interactions.

ISBN: 9780542658808Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Supercritical carbon dioxide dispersion of nano-clays and characterization of polymer-clay nanocomposites.
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500 $a Advisers: Rangaramanujam Kannan; Esin Gulari.
502 $a Thesis (Ph.D.)--Wayne State University, 2006.
520 $a Nanocomposites consisting of highly anisotropic layered silicates have received a great deal of attention owing to the potential for unprecedented increases in mechanical properties, barrier properties, and flame retardant properties. They key challenge is to disperse/exfoliate the layered silicates into individual sheets in order to take advantage of their large available surface area (&sim;760 m2/g). In this research, a novel supercritical carbon dioxide (scCO2) processing method was utilized to disperse nano-clays. The structure and properties of the clays and the resultant nanocomposites are characterized using a combination of wide-angle X-ray diffraction (WAXD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and rheology. Significant dispersion was achieved with Cloisite 93A clay, whereas relatively poor dispersion was achieved with Cloisite Na+ (natural clay). The extent of clay dispersion appears to be dependant on the 'CO2-philicity', which in turn depends on the surface modifications and inter gallery spacing. The presence of an acidic-hydrogen on the Cloisite 93A surface appears to play a strong role on its 'CO2-philicity'. We further demonstrate that CO2-phobic Cloisite Na+ (natural clay) can be dispersed with scCO2, using a CO2-philic polymer, polydimethylsiloxane (PDMS). The dispersed clay-PDMS nanocomposite shows an order of magnitude increase in the dynamic storage modulus at low frequencies, accompanied by the emergence of a 'solid-like' plateau, characteristic of dispersed nanocomposites with enhanced clay-polymer interactions.
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