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Sub-Critical Gas-Assisted Processing...

Ellingham, Thomas K., Jr.

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Sub-Critical Gas-Assisted Processing of Polymer Nanocomposites and Blends.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Sub-Critical Gas-Assisted Processing of Polymer Nanocomposites and Blends./
Author:	Ellingham, Thomas K., Jr.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	117 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-08, Section: B.
Contained By:	Dissertations Abstracts International80-08B.
Subject:	Nanotechnology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13427816
ISBN:	9780438837959

Sub-Critical Gas-Assisted Processing of Polymer Nanocomposites and Blends.
Ellingham, Thomas K., Jr.

Sub-Critical Gas-Assisted Processing of Polymer Nanocomposites and Blends. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 117 p.

Source: Dissertations Abstracts International, Volume: 80-08, Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2019.

This item must not be sold to any third party vendors.

A novel and facile sub-critical gas-assisted processing (SGAP) method for enhancing the dispersion of nanocomposites and blends during twin-screw extrusion (TSE) is introduced. Three nanocomposite systems were investigated: polypropylene (PP) with 0.5wt% graphene nanoparticles (GNPs), ethylene vinyl alcohol (EVOH) with 5wt% nanoclay (NC), and PP with 10wt% polycaprolactone (PCL) and 5wt% NC. The SGAP method injects sub-critical carbon dioxide (CO 2) or nitrogen (N2) into the melt during extrusion, which causes foaming. Bubble expansion during foaming introduces an equibiaxial elongational flow not otherwise generated in TSE, adding to the total stress the polymer matrix can exert to break up nanoparticle agglomerates and reduce the droplet size of secondary polymers in blends. In PP, samples processed with SGAP using CO2 were found to have a better dispersion of GNPs as evidenced by x-ray diffraction (XRD), scanning electron microscopy (SEM), rheology, Raman spectroscopy, and thermogravimetric analysis (TGA). In EVOH, nanoclay was shown to have increased dispersion with CO2 or N 2, as confirmed via XRD, SEM, rheology, TGA, and micro-computed tomography (μCT). An additional benefit of SGAP was a decrease in the amount of thermo-oxidative degradation in EVOH during processing. In PP, SGAP using N2 aided in reducing the droplet size of PCL and exfoliating the NC as measured with SEM and XRD. As a result, impact resistance was increased. SGAP has been shown to be effective in increasing the dispersion of 2D nanofillers and reducing the secondary phase size in polymer nanocomposites and blends.

ISBN: 9780438837959Subjects--Topical Terms:

526235
Nanotechnology.

Sub-Critical Gas-Assisted Processing of Polymer Nanocomposites and Blends.
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300 $a 117 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-08, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Turng, Lih-Sheng.
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506 $a This item must not be sold to any third party vendors.
520 $a A novel and facile sub-critical gas-assisted processing (SGAP) method for enhancing the dispersion of nanocomposites and blends during twin-screw extrusion (TSE) is introduced. Three nanocomposite systems were investigated: polypropylene (PP) with 0.5wt% graphene nanoparticles (GNPs), ethylene vinyl alcohol (EVOH) with 5wt% nanoclay (NC), and PP with 10wt% polycaprolactone (PCL) and 5wt% NC. The SGAP method injects sub-critical carbon dioxide (CO 2) or nitrogen (N2) into the melt during extrusion, which causes foaming. Bubble expansion during foaming introduces an equibiaxial elongational flow not otherwise generated in TSE, adding to the total stress the polymer matrix can exert to break up nanoparticle agglomerates and reduce the droplet size of secondary polymers in blends. In PP, samples processed with SGAP using CO2 were found to have a better dispersion of GNPs as evidenced by x-ray diffraction (XRD), scanning electron microscopy (SEM), rheology, Raman spectroscopy, and thermogravimetric analysis (TGA). In EVOH, nanoclay was shown to have increased dispersion with CO2 or N 2, as confirmed via XRD, SEM, rheology, TGA, and micro-computed tomography (μCT). An additional benefit of SGAP was a decrease in the amount of thermo-oxidative degradation in EVOH during processing. In PP, SGAP using N2 aided in reducing the droplet size of PCL and exfoliating the NC as measured with SEM and XRD. As a result, impact resistance was increased. SGAP has been shown to be effective in increasing the dispersion of 2D nanofillers and reducing the secondary phase size in polymer nanocomposites and blends.
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