JUDAH, Hassan (2020). The synthesis, characterisation and rheological properties of clay-polymer nanocomposites. Doctoral, Sheffield Hallam University. [Thesis]
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Judah_2019_PhD_SynthesisCharacterisationRheological.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.
Judah_2019_PhD_SynthesisCharacterisationRheological.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.
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Abstract
This study aims to investigate the effect of different crosslinking agent and different
crosslinking agent content on the material properties of the clay-polymer
nanocomposite. A lot of materials were tried to be mixed to form a fully-reacted
clay-polymer nanocomposite for the first time, which is a part of the novelty for this
work. The overall properties governed by clay properties and clay/polymer
relationship are prime aspects of this study. The Enhancement of significant
properties of nanocomposites is a measure of clay platelets dispersion within the
polymer matrix. Different approaches were adopted to understand the influence of
clay properties on the nanocomposite; (i) by examining and comparing different
clays as raw, dry, powder material using spectroscopy and thermogravimetric
analysis (ii) mechanical examination of clay/water suspension of different clay
types/grads, and different concentrations varying from 0.5 % - 10 % using
rheological studies (iii) chemical and mechanical and morphological examination of
Clay/Polymer nanocomposite with different clay types/grades, concentration, and
polymers.
The synthesis of such material addresses issues including heterogeneity,
processability, injectability, crosslinking and mechanical stability. The synthesis
requires no purification steps no specialist equipment, and basic typical
components of crosslinked nanocomposite/hydrogels (water, monomer, clay and
initiator).
Morphological, pore size and scaffolding general arrangement which shows the
effect of different crosslinking agents and crosslinking density were examined by
Scanning Electron Microscope (SEM) to acquire information on wide/small pores
are, diffusion kinetics in the system if required for further applications. The nature
and elemental composition of the clay-polymer nanocomposites were determined
by X-ray diffraction (XRD), X-ray fluorescence (XRF), and Fourier Transfer Infrared
(FTIR) spectroscopy. The water content in the dry clay-polymer nanocomposite was
determined and examined by Thermogravimetric analysis (TGA). Mechanical and
rheological properties of the result were examined using a rheometer that operates
on different modes (as a Dynamic Mechanical Analysis (DMA) technique) to
evaluate the structure, performance, strength, and mechanical modules of these
nanocomposites under different rotational and oscillatory loads. This offers the
opportunity to relate the differences to the clays and polymers the hydrogels were
synthesised from.
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