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 82 for “"poly(acrylic acid)"”.
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Characterization of polystyrene-block-poly (acrylic acid) micelles
… size and spatial distribution of micelles of poly(styrene-block-acrylic acid) (PS-b-PAA) in organic solvents or assembled on solid substrates have been investigated. The micelles were characterized in the solvated state using Dynamic Light Scattering, and were imaged and characterized in the …
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Nasal delivery of peptides using powder carriers based on starch/poly(acrylic acid)
… viscosity-enhancing and/or bioadhesive polymers. The results obtained using the modified protocols suggested that the present procedure might underestimate the tissue damaging potential of these formulations, especially for those test formulations at the borderline between a mild and …
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Fundamentals and application of the collapse transition of poly(acrylic acid) for synthesis of various polymer-templated nanoparticles
The collapse of a long chain polymer from extended to globular conformation can be the basis for a synthesis of nanoparticles. For example, a negatively charged polyelectrolyte can be collapsed by positively charged counterions, forming a nano-sized polymer-counterion particle. Upon stabilization …
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Development of a platform for nasal delivery of peptides and vaccines using powder carriers based on starch/poly(acrylic) acid
… of maize starch (Amioca®) and a cross-linked acrylic acid-based polymer (Carbopol® 974P) was used as powder carrier to amplify the mucoadhesive capacity of the formulation. In a first part of the study, the Amioca®/Carbopol® powder formulation was subjected to a heat treatment procedure. After …
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Polyelectrolyte multilayers incorporating photocrosslinking polymers for controlling 2- and 3-dimensional structure
Polyelectrolyte multilayer (PEM) assembly is a technology for building thin films with a number of useful and novel functionalities. PEMs interact favorably with proteins and other biomolecules making them potentially valuable as biomaterials. Many systems of polymers have been studied for use in …
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Fundamental studies of pH-sensitivity in polyelectrolyte multilayers
… of the pH-sensitive behavior of weak polyelectrolytes, such as poly(acrylic acid)(PAA) and poly(allylamine hydrochloride) (PAH) from two perspectives of the assembled multilayers - functional group composition and layer growth. In the first part of this thesis, with respect to the …
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The evaluation of an organophosphate thermosetting resin for use in a high temperature resistant composite and a study of chemistry of ionomer cements
… dental cement (ASPA), prepared from aqueous poly(acrylic acid) and an ion-leachable aluminosilicate glass, has been developed. The system has been extended by studying other aqueous polymers. The factors influencing the gelation and the properties of the set cements have been examined. …
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The Synthesis and Polymerization of N-Vinylacrylamide.
… of N-vinylacrylamide and, eventually, the cyclopolymerization of this monomer which, upon hydrolysis, should yield the alternating copolymer, poly(acrylic acid-co-vinylamine). N-vinylacrylamide was prepared by condensing two moles of acrylamide with one mole of acetaldehyde to give the …
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Amphiphilic Diblock Copolymers: Study of Interpolyelectrolyte Complexation in Organic Media and Nanoencapsulation of Melatonin
Two oppositely charged homopolyelectrolytes poly(2-(methacryloyloxy)ethyl¬dimethyl-ethyl¬ammonium bromide) (PDMAEMAQ) and poly(acrylic acid) (PAA), and amphiphilic diblock copolymers based on polystyrene and the ionizable block poly(acrylic acid) were synthesized via Atom Transfer Radical …
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Encapsulamento de nanopartículas magnéticas em polímeros acrílicos e avaliação de hipertermia para potencial tratamento de câncer
… iron oxide nanoparticles encapsulated in acrylic polymers. Magnetite (Fe3O4) was obtained through coprecipitation and encapsulated by inverse and direct miniemulsion polymerization, in poly(acrylic acid) and poly(methyl methacrylate), respectively. Besides, the folic acid bioconjugation …
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Characterization of new surface morphologies in a hydrogen-bonded multilayer system
… an analysis of surface morphology changes in poly(acrylic acid)/polyacrylamide (PAA/PAAm) hydrogen-bonded multilayers. These changes were induced by immersion of the films in aqueous solutions of poly(allylamine hydrochloride), or PAH, at different levels of pH. Positive charges on PAH are …
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Synthesis and study of the micellization behavior of a dual temperature- and pH-responsive PAA-b-PNIPAM block copolymer
<p>Amphiphilic diblock copolymers are composed of hydrophilic and hydrophobic regions. When they are exposed to water, the hydrophobic blocks aggregate to form a hydrophobic core surrounded by hydrophilic regions outside to give a core-shell micelle. These micelles have many potential applications, …
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The synthesis of amphiphilic diblock copolymers: An investigation into the formation of micelles as a function of hydrophobic block length
<p>Acrylate-based amphiphilic diblock copolymers show great potential for anti-cancer drug transport due to their ability to aggregate into protective core-shell micelles. Using RAFT polymerization, copolymers containing poly(acrylic acid) and poly(methyl acrylate) blocks were made with high …
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Influence on molecular geometry and chain conformation on properties of polyelectrolyte multilayers
… is a versatile technique for fabricating thin polymer films. This thesis compares the properties of LbLfilms composed of different weak polycations. Slight perturbations in film assembly conditions can lead to large differences in film properties. Polyion bacisity and architecture are less …
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Surface engineering using layer-by-layer assembly of pH-sensitive polymers and nanoparticles
… by using layer-by-layer assembly of pH-sensitive polymers and nanoparticles. In the first part of this thesis, hydrogen-bonded multilayer coatings comprising poly(acrylic acid) and polyacrylamide were used to functionalize spherical colloidal particles. Multilayer-modified colloids showed an …
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Synthesis and Characterization of Novel Polyethers and Polydimethylsiloxanes for Use in Biomaterials
This dissertation focuses on the use of novel polyethers and polydimethylsiloxanes in the stabilization of magnetite nanoparticles as well as biomedical applications. The colloidal stabilities of magnetite nanoparticles coated with polyethers containing various functional endgroups were studied. …
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Polyelectrolyte multilayer thin films with antimicrobial, antifouling and drug releasing properties
This thesis work focuses on designing thin polyelectrolyte multilayer (PEM) films via layer-bylayer (LbL) deposition technique with the ability to kill pathogenic bacteria and inactivate human viruses, especially the influenza (flu) virus on contact. This work builds on four years of research at …
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Development of Polymeric Nanocarriers for Dual Magnetic Resonance Imaging and Drug Delivery
Two types of (polymer-imaging agent-drug) complexes were prepared and characterized. These included block and graft copolymer complexes with magnetite nanoparticles and manganese ions. Magnetite block ionomer complexes (MBICs) were formed through binding of a portion of the anionic segment of …
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Purification of recombinant proteins with magnetic nanoclusters
… of 8 nm magnetite (Fe₃0₄) cores coated with poly(acrylic acid-co-styrenesulfonic acid-co-vinylsulfonic acid). For use in separation, clusters must be recoverable from solution. Individual nanoparticles are too small to be recovered efficiently, while 50nm or larger clusters of primary …
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