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 41 for “"Polymer particles"”.
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The Application Of Polymer Particles In Industrial Processes
… processes that involve the use of recyclable polymeric particles as a partial replacement for aqueous media and chemicals. The application of the technology typically leads to water savings of over 80% and chemical savings of over 25%. These industrial processes may be characterised in that …
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Mechanical reinforcement of films from rubber latices by added polymer particles
… which influence the ability of added polymer particles prepared as latices 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 …
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Multiscale simulation of heterophase polymerization : application to the synthesis of multicomponent colloidal polymer particles
Heterophase polymerization is a technique widely used for the synthesis of high performance polymeric materials with applications including paints, inks, adhesives, synthetic rubber, biomedical applications and many others. Due to the heterogeneous nature of the process, many different relevant …
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Propulsion of polymer particles on caesium ion-exchanged channel waveguides for stem cell sorting applications
Optical trapping of particles has become a powerful non-mechanical and nondestructive technique for precise particle positioning. The manipulation of particles in the evanescent field of a channel waveguide potentially allows for sorting and trapping of several particles and cells simultaneously. …
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Remote optical fiber sensing based on reflectance due to the swelling of polymer particles produced by dispersion polymerization
<p>Poly (4-vinyl pyridine) particles produced by dispersion polymerization were suspended in a hydrogel membrane and used for remote measurements employing fiber optic sensors. The refractive index of poly(4-vinyl pyridine) particles is higher than the refractive index of the hydrogel. At low pH, …
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Ultrasonic Microscopy Analysis of Corrosion -- A Nondestructive Evaluation of Paint Weathering Effects <i>and</i> Synthesis and Characterization of Nanoscale Water-reducible Polymer Particles
… our studies, nanoscale water reducible acrylic copolymers (PMMA-MAA) with zero volatile organic compound (VOC) were synthesized and characterized. Five controllable variables which were molecular weight, acid number, %solids of polymer dissolved in THF, extent of neutralization and flow rate of …
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Towards understanding RAFT aqueous heterophase polymerization
… technique for studying the aqueous heterophase polymerization. The polymerization rates obtained by calorimetric investigation of ab initio emulsion polymerization of styrene revealed the strong influence of the type and combination of the RAFT agent and initiator on the polymerization rate and …
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Chemical sensors based on swellable polymer microparticles and molecular imprinted polymers
… thermoresponsive and lightly cross-linked polymer microparticles were prepared for the development of chemical sensors for various target analytes. The swelling and shrinking of the polymer particles as a function of concentration of target analytes has been investigated using turbidity and …
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The effects of polymeric binders on the processability and properties of composites made by suspension prepregging
… use of a binder dispersant: i) to disperse the polymer particles so as to get good fiber-matrix distribution in the prepreg, and ii) to improve the handling characteristics of the prepreg, by holding the matrix to the fibers and the fibers to themselves. The effects of the binder on the …
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Ring-opening Metathesis Polymerization for the Creation of Responsive Colloids and Surfaces
Ring-opening metathesis polymerization (ROMP) is a well-controlled living polymerization method and has been widely used to synthesize various polymer materials. This thesis investigates the use of ROMP in the creation of responsive materials, including photonic polymer colloids and …
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Experimental and Numerical Study of Multi- Phase Flow in a Coaxial Air Jet
The ultimate goal of this work was to optimize a polymer flame deposition process by developing an experimentally verified numerical model of it. This process consisted of injecting a polymer powder into an air/propane flame where the powder was heated enough to soften it before it was projected on …
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Comprehensive Study of Semicontinuous Emulsion Polymerisation Processes for Producing Nanoparticles
Semicontinuous emulsion polymerisation offers flexibility and versatility for manufacturing colloids for a wide range of applications. The technique has been studied since 1950s, however, its importance has only recently realized as evidenced by increasing attentions it has received in recent …
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Understanding the Role of N-Methylolacrylamide (Nma) Distribution in Poly(Vinyl Acetate) Latex Adhesives
… refers to the three potential locations of polymerized NMA units in a latex: the water-phase, the surface of polymer particles, and the core of the polymer particles. The objective is to identify the distribution of NMA in three latices and to determine whether NMA distribution correlates …
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Modelling of an industrial fluidised bed dryer
… bed drying is often a vital operation in polymer production, it remains difficult to predict the dryer performance accurately as no general application models have been published. To investigate the coupled relationship between the operating parameters, fluidisation regimes and drying …
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Ultrasonically initiated free radical catalyzed emulsion polymerization of methyl methacrylate
<p>"The emulsion polymerization of methyl methacrylate initiated by ultrasound has been studied at ambient temperature using sodium lauryl sulfate as the surfactant.</p> <p>The source of the free radical for the initiation process was found to come from the degradation of the sodium lauryl sulfate …
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Mechanical Properties of Polymer Modified Mortar
The mechanical properties of the polymer-modified mortar are markedly improved over conventional cement mortar. We utilized recycled ABS in powder form and a polymer latex emulsion, polymer percentage ranges from 0 to 25 percent by polymer/cement ratio were investigated. The mechanical properties …
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Thermally-responsive interpenetrating polymer network nanoparticles as intelligent therapeutic systems
Thermally-responsive interpenetrating polymer network (IPN) nanoparticles, composed of polyacrylamide, poly(acrylic acid), poly(methacrylic acid), poly(2-ethylacrylic acid), and poly(2-propylacrylic acid), were synthesized using a sequential inverse emulsion polymerization technique. These …
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Surfactants in nonpolar oils: agents of electric charging and nanogel templates
… observable surface charge of suspended polymer particles. Both types of surfactant are found to generate mobile ions in solution as well as particle charge; and in the more surprising case of nonionic surfactants, the occurrence of particle charge and screening ions is confirmed …
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In Situe Synthesis of Iron Oxide within Polyvinylamine nanoparticles
Magnetic nanoparticles that display high saturation magnetization and high magnetic susceptibility with a size less than 200 nm are of great interest for medical applications. Investigations of magnetic nanoparticles have been increasing over the last decade. Magnetite nanoparticles are …
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