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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"polymer clay"”.
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Polymer/clay nanocomposite hydrogels with anisotropic properties
… and distribution of dispersed particles within polymer composites to create materials with anisotropic properties. However, limited literature exists on anisotropic nanocomposite hydrogels prepared under low magnetic fields, which are of interest for various soft and wet applications. This …
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Polymer/Clay Nanocomposites as Barrier Materials Used for VOC Removal
… of incorporation of a silicate layered nanoclay into a polymer matrix can affect the barrier properties of the pristine polymer in order to decrease the transport of volatile organic compounds (VOC) in indoor air. Building materials are a primary source for VOCs. These emissions are a …
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Supercritical Carbon Dioxide Processing Of Nano - Clays And Polymer/clay Nanocomposites
<p>Effective dispersion of the fillers in a polymer matrix and improvement of polymer-clay interactions are two key challenges in the field of nanocomposites. A novel processing method that utilizes the unique properties of supercritical carbon dioxide (scCO2) to disperse nano-clay and prepare a …
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Thermo-analytical and physico-chemical characterisation of organoclays and polymer-clay nacomposites.
A variety of modified clay minerals have been screened to determine their effectiveness as agents for the production of polystyrene-clay nanocomposites. The n-alkylammonium and n-alkyltrimethylammonium surfactants employed to compatibilise the aluminosilicate layers of the minerals were shown to …
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Multiscale micromechanical modeling of the thermal/mechanical properties of polymer/clay nanocomposites
Polymer/clay nanocomposites have been observed to exhibit enhanced thermal/mechanical properties at low weight fractions (We) of clay. Continuum-based composite modeling reveals that the enhanced properties are strongly dependent on particular features of the second-phase "particles"; in …
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Biodegradable polymer/clay nanocomposites based on poly(butylene adipate-co-terephthalate) and Polylactide
… which leads to property-enhanced biodegradable polymer products for broader application, as well as in promoting the use of bio-sourced renewable polymers such as Polylactide (PLA) in biodegradable polymers with desirable properties from petroleum based polymers such as PBAT, this study and its …
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Preferential nanoreinforcement of thermoplastic polyurethane elastomers with dispersed nano-clay
… applications I have prepared polyurethane/clay nanocomposites. Polymer/clay nanocomposites have exhibited great potential for providing enhanced and possibly-tunable thermomechanical behavior. However, the biggest challenge facing advances in polymer/clay nanocomposites is the complete …
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Characterize the molecular dynamics of materials for 4D printing
… 1) molecular dynamics of microstructure of clay in composite inks and 2) translation of rheological behavior of yield stress fluids to quality of printing. These printing-centric approaches are combined in order to advance the field of 4D printing towards fabrication of spatiotemporal …
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Ion transport and structure of layer-by-layer assemblies
… temperature dry conductivity was -108 S cm-1. Polymer-clay nanocomposites were investigated for structural and transport anisotropy. LPEI/Laponite/PEO films demonstrated an oriented structure where clay nanoplatelets lay parallel to the substrate and assembly in sheets with polymer in-between.
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Fabrication and Gas Permeation Studies on Polyimide/Layered-Aluminum Phosphate Nanocomposite Membranes
Polymer – clay nanocomposites have improved thermal, mechanical, and barrier properties when compared with the pure polymer. The objective of this study was to examine if gas separation performance could be improved by introducing a layered nanopourous aluminum phosphate with a large aspect ratio …
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PMMA Clay Nanocomposites
Polymer clay nanocomposites (PCN) of poly(methyl methacrylate) (PMMA) and clay, were synthesised in-situ using a free radical suspension polymerisation technique. The weight fraction of clay in the PCN was systematically varied in order to understand the effect of clay on the physical properties of …
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Self-Assembly of Surface-modified Clays for Functional Biomimetic Materials
Synthetic Laponite-clay particles with a platelet-like shape display strong gelation when dispersed in aqueous solutions because of their positively charged rims and negatively charged flat surfaces. In this thesis, my aim was to modify the surfaces of these clay particles such that we can both …
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Hybrid Inorganic-Organic Materials: Novel Poly(Propylene Oxide) Based Ceramers, Abrasion Resistant Sol-Gel Coatings for Metals, and Epoxy-Clay Nanocomposites. With an Additional Chapter On: Metallocene Catalyzed Linear Polyethylene
… stainless steel. In another study, intercalated polymer-clay nanocomposites were prepared based on various epoxy networks montmorillonite clay. This work explored the influence of incorporated clay on the adhesive properties of the epoxies. The lap shear strength decreased with increasing clay …
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Process for Improving the Exfoliation and Dispersion of Nanoclay Particles into Polymer Matrices Using Supercritical Carbon Dioxide
… in this work to help exfoliate and disperse nanoclay into the polymer matrices at high clay content. The process involves the use of a pressurized CO₂ chamber to assist in the exfoliation and delivery of the clay into a stream of polypropylene (PP) melt within the extruder. This CO₂ method was …
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Tensile and fracture behaviour of isotropic and die-drawn polypropylene-clay nanocomposites. Compounding, processing, characterization and mechanical properties of isotropic and die-drawn polypropylene/clay/polypropylene maleic anhydride composites
… University Belfast were evaluated. Subsequently, polymer/clay nanocomposite materials were produced at Bradford, where mixing and processing routes were explored and the mechanical properties of the compounded samples were examined. Particular attention was given to the clay intercalation …
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Tensile and fracture behaviour of isotropic and die-drawn polypropylene-clay nanocomposites. Compounding, processing, characterization and mechanical properties of isotropic and die-drawn polypropylene/clay/polypropylene maleic anhydride composites
… Belfast have been evaluated. Subsequently, polymer/clay nanocomposite material has been produced at Bradford. Mixing and processing routes have been explored, and mechanical properties for the different compounded samples have been studied. Clay intercalation structure has received …
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The Manufacture of Polymer Nanocomposite Materials Using Supercritical Carbon Dioxide
… as a processing aid to help exfoliate nano-clays and improve their dispersion during melt blending in polymer matrices has been reported in the literature. One of the best processes in terms of improving the degree of nano-clay dispersion and composite mechanical properties was developed in …
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Processing and Properties of Hybrid Silane-Epoxy Nanocomposite Coatings
… and evaluation of the properties of hybrid organoclay composites coatings and membranes. The control material used in this study is water based epoxy ester due to its low volatile organic content and better corrosion resistance than the epoxy resins. The use of epoxy ester is limited by its poor …
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The synthesis and development of novel, easily processable poly (n-isopropylacrylamide)-based hyrdogels.
… method which allows a fully-reacted PNIPAM/clay nanocomposite system to remain a watery liquid until it is cooled to a predetermined temperature. Beyond this temperature, the polymer/clay precursor hydrogel liquid (PCPH) spontaneously forms a cross-linked hydrogel that does not re-liquefy …
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In Search of the Ooey Gooey Good
<p>This thesis explores ideas of everydayness, the mundane, and the repetitive emptiness of consumer culture. It looks at the malaise that plagues everyday life and examines several attempts throughout history to break from its grips which revolve around a search for a more ideal state. This …
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