SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS

SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS

Bibliographic Details
Main Author: JUSTICE, RYAN SCOTT
Language:English
Published: University of Cincinnati / OhioLINK 2007
Subjects:
small-angle scattering
nanocomposites
carbon nanotubes
colloidal silica
layered silcates
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196088584
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ucin11960885842021-08-03T06:12:23Z SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS JUSTICE, RYAN SCOTT small-angle scattering nanocomposites carbon nanotubes colloidal silica layered silcates Loading polymer matrices with nanoscale fillers is widely believed to have the potential to push polymer properties to extreme values. Realization of anticipated properties, however, has proven elusive. Recent nanocomposite research suggests better characterization of the large-scale morphology will provide insight explaining these shortfalls. The chapters in this dissertation present ultra small-angle X-ray scattering (USAXS) as a viable tool for elucidating the hierarchical filler morphology that exists within polymer nanocomposites. In Chapter 1, the relationship between imaging data and scattering data is discussed in the context of filler dispersion, where scattering is presented as a complementary characterization technique that, when combined with microscopy, can reveal significantly more morphological information than possible with either technique independently. Chapter 2 provides the details of both a simplified and a fractal tube form factor for the analysis of tube-like (hollow cylinder) fillers, and the analysis of carbon nanotube-filled bismaleimide composites is presented. In Chapter 3, the fractal tube form factor is also used to augment the analysis of percolative networks in carbon nanofiber-filled epoxy composites. The analysis shows that the morphology resulting in electrical percolation in these systems is much more complicated than more common analysis techniques have shown in the literature. Chapter 4 presents the characterization of a system of colloidal silica/epoxy nanocomposites that shows toughness and modulus improvement without sacrificing the working temperature of the neat resin. USAXS analysis concludes the nanoparticles are individually dispersed up to loadings of 25 wt% with an exclusion zone extending to at least ~10x the particle radius at all loadings. While the exclusion zone is not mechanically significant, the silica particles are shown to be effective in reinforcing hard resins. In Chapter 5, the details of a layered-silicate/epoxy system that is scalable and shows both improved toughness and flexural modulus over the neat resin are documented. The implication from this work is homogeneity in the layered silicate morphology is imperative to have simultaneous improvement of modulus and fracture toughness. However, homogeneity in filler morphology is not exclusive to complete exfoliation of the nanoclay layers. 2007 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196088584 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196088584 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic small-angle scattering
nanocomposites
carbon nanotubes
colloidal silica
layered silcates
spellingShingle small-angle scattering
nanocomposites
carbon nanotubes
colloidal silica
layered silcates
JUSTICE, RYAN SCOTT
SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS
author JUSTICE, RYAN SCOTT
author_facet JUSTICE, RYAN SCOTT
author_sort JUSTICE, RYAN SCOTT
title SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS
title_short SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS
title_full SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS
title_fullStr SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS
title_full_unstemmed SMALL-ANGLE SCATTERING FROM NANOCOMPOSITES: ELUCIDATION OF HIERARCHICAL MORPHOLOGY/PROPERTY RELATIONSHIPS
title_sort small-angle scattering from nanocomposites: elucidation of hierarchical morphology/property relationships
publisher University of Cincinnati / OhioLINK
publishDate 2007
url http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196088584
work_keys_str_mv AT justiceryanscott smallanglescatteringfromnanocompositeselucidationofhierarchicalmorphologypropertyrelationships
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