Global ETD Search
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 27 for “"mechanical reinforcement"”.
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Functionalized Graphene: Characterization and Mechanical Reinforcement
… graphene, derived from humic acid, provides mechanical reinforcement in polymer nanocomposites. This provides a new, alternative source for graphene-like material and eliminates the need for an oxidative step currently used to exfoliate graphite. Functionalized graphene has properties similar …
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Mechanical reinforcement of films from rubber latices by added polymer particles
… by emulsion polymerisation to reinforce the mechanical properties of films derived from rubber latices, particularly post-vulcanised natural rubber latex, have been investigated. The emphasis has been upon the enhancement of tear strength and puncture strength.
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Mechanical reinforcement of polyacrylamide hydrogels using pristine single-walled carbon nanotubes
… they commonly do not have sufficient mechanical strength required for artificial soft tissues. Here, the author fabricated reinforced PAAm hydrogels using single-walled carbon nanotubes as reinforcing materials. The fusion of SWCNTs and the PAAm matrix successfully generated …
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Towards Mechanical Reinforcement in Polymer Layered Silicates Nanocomposites of the Second Generation
… for preparation of nanocomposites with improved mechanical reinforcement. The mechanical characterization was done in collaboration with the Polymer Engineering Department at Bayreuth University in the frame work of SFB 840 (Project B3). The synthetic Na-fluorohectorite clay applied in this …
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Understanding plant water relations and root biomechanics for hydro-mechanical reinforcement of slopes
Vegetation stabilises slopes via both mechanical reinforcement (through root anchorage) and hydrologic reinforcement (through transpiration-induced soil matric suction). However, relatively little is known about the effectiveness of different plant species in stabilising soil slopes via the two …
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Mechanical reinforcement and property tuning of adhesive elastomers with polymer-grafted inorganic nanoparticles
… viscoelastic nature renders them vulnerable to mechanical destruction, degradation, and creep, limiting their application window. Established methods for strengthening the PSA film have relied on stiffening the adhesive component, either by increasing network density via crosslinking bonds or …
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Multi-point temperature sensing in gas turbines using fiber-based intrinsic Fabry-Perot interferometers
… size of the test coupon, sensor placement, and mechanical reinforcement of the fiber could arise. This thesis details the preparation and results of this investigation. It turns out that fabricating a sensor chain with appropriate sensor spacing and excellent temperature response characteristics …
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Application of Calcium Phosphate based gels for encapsulation of therapeutic molecules
… primary bonds between apatite crystals enabling mechanical reinforcement of the material, which is currently too weak to bear load. This work has confirmed that different drying regimes have a significant influence on the formation of the gel pore structure, with the storage of gel in humid …
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Synthesis of composite hydrogels incorporating D,L-cyclic peptide nanotubes as a platform for materials engineering
… into the hydrogel matrix and provided some mechanical reinforcement, without affecting hydrogel porosity or hydration characteristics. We will be using this composite system as a platform for engineering hydrogels with unique physical and biological properties to the hydrogel, for …
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Understanding the Chemistry and Mechanical Properties of Metal-Organic Framework-Polymer Composites
… molecular separation, gas storage, and mechanical reinforcement. However, the majority of MOFs exist as particulate powders, limiting their transportability and applicability in practical fields. Polymers, on the other hand, are one of the most widely used materials in the world owing to …
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Thermal imaging and analysis of carbon nanotube composites
… solar cells and transistors to bolometers and mechanical reinforcement additives for polymers. However, surprisingly little is still known about the thermal properties of such CNT films, and in particular about the intertube junctions. This study examines suspended films of conductive …
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Polymer-Particle Nanocomposites: Size and Dispersion Effects
… a broad range of material properties (e.g. mechanical, optical, electrical and gas permeability properties). This dissertation will focus on explanation and quantification of mechanical property improvements upon the addition of nanoparticles to polymeric materials. Nanoparticles, as …
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Bioinspired mineralization in hydrogels for sustainable materials processing
… have been widely studied due to their unique mechanical properties, afforded by their inorganic-organic composite structure and well-controlled growth in macromolecular environments. More recently, growing concerns over climate change and environmental sustainability and the emerging relevance …
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Design, characterization, and reinforcement of mineralized collagen-glycosaminoglycan scaffolds for orthopedic wound repair
… specific to orthopedic defects; (3) demonstrate mechanical competence for surgical implantation and subsequent loading during function. This work outlines the development of a collagen-glycosaminoglycan platform that satisfies these requirements for the treatment of craniofacial defects. Chapter …
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PP and Nanofibrillated-PET Composites from Melt Blowing: Fundamentals to Scale-Up
… with a sea-island morphology. Initially, the reinforcement domains are dispersed within the matrix, and then a large extensional deformation is applied, causing the domains to in-situ fibrillate into long-aspect ratio fibrils. These micro-/nano-scale diameter fibrils, with their high …
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Modification of the mechanical properties of synethetic hydrogels by various techniques
A study in the field of hydrogel reinforcement has been carried out, the reinforced hydrogel being a copolymer of 2-hydroxyethyl methacrylate and methacrylic acid, crosslinked with ethylene glycol dimethacrylate and having an equilibrium water content at pH 8.5 of 74% by weight. Three methods of …
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Electrochemical synthesis and characterisation of polypyrrole/chitosan films doped with molecular anions
… and it appears that the chitosan provides some mechanical reinforcement to the composite. A second approach was investigated and in this case, chitosan was cast on to the doped polypyrrole post electropolymerisation and then cured under an infrared lamp. This was found to be more suitable for …
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Production and characterisation of bioresorbable polymers and polymer-glass composites for application in cardiac stents
… (PLLA) stents have been limited by poor mechanical properties and slow degradation. Materials with increased strength and stiffness are needed, to reduce the required stent strut size and elastic recoil, so that the risk of restenosis can be minimised. Long term complications such as …
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Improvement of the Optical and Mechanical Properties of Silica Nanoparticle Ionic Self-Assembled Multilayer Anti-Reflection Coatings on Glass and Polycarbonate Substrates
… presents the characterization of the optical and mechanical properties of silica nanoparticle films fabricated by ionic self-assembly, also known as layer-by-layer (LbL) deposition. Utilizing electrostatic attraction of oppositely-charged materials permits uniform and rapid growth of the …
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Effect of Cellulose Nanocrystals on the Rheology, Curing Behavior, and Fracture Performance of Phenol-Formaldehyde Resol Resin
… release during resin cure. For analysis of the mechanical properties during and after cure, sandwich-type test specimens were prepared from southern yellow pine strips and the resin and CNC–resin mixtures. The mechanical properties of the test specimens were measured as a function of time and …
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