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Showing 1 to 18 of 18 for “"pHEMA"”.
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Kontrollierte Darstellung von Blockcopolymeren durch atom transfer radical polymerization (ATRP) und Untersuchungen der Oberflächenmorphologie durch Rasterkraftmikroskopie
… PEO-b-PS and PS-b-PEO-b-PS as well as PEO-b-PHEMA and PHEMA-b-PEO-b-PHEMA block copolymers is presented. The method comprises the preparation of mono- and bifunctional PEO-macroinitiators and their application in the ATRP of styrene and HEMA. Model initiators and monofunctional …
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Investigation of Amorphous Solid Dispersions of Poorly Water-soluble Drugs in Poly (2-hydroxyethyl Methacrylate) Hydrogels for Enhanced Solubility and Controlled Release
… amorphous solid dispersions (ASD) in crosslinked PHEMA hydrogels to enhance the dissolution behavior of poorly water-soluble drugs. The first part of the study identifies physicochemical properties affecting the solid state and physical stability of ASD of the model drug indomethacin (IND) in …
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Initiated chemical vapor deposition of polymeric thin films : mechanism and applications
… based on poly(2-hydroxyethyl methacrylate) (PHEMA) and poly(cyclohexyl methacrylate) (PCHMA) were synthesized using iCVD. PHEMA thin films with specific degrees of cross-linking leading to well-defined structural, thermal, wetting, and swelling properties were made in a single vacuum step by …
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Direct-write assembly of 3D microperiodic scaffolds for tissue engineering applications
… chains of poly(2-hydroxyethyl methacrylate) (pHEMA) in a photopolymerizable solution, (2) a silk fibroin ink, regenerated from Bombyx mori silkworm cocoons, that can be induced to change conformation in a coagulating reservoir, and (3) a hydroxyapatite (HA) particle-filled silk fibroin ink. By …
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Investigation into obstacles to the implementation of the directed-self assembly of block copolymers
… PtBS-b-Poly(2-hydroxyethyl methacrylate) (PtBS-b-PHEMA), respectively. PtBS-b-PPMA is a new low X BCP that may be useful in applications such as photonic crystals and filtration membranes as well as in discerning the relationship between defect annihilation rates and X. PtBS-b-PHEMA is a new high …
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Improvement in Energy Conversion and Energy Storage Applications by Liquid Crystals and Carbon Nanoparticles
… fabricated for flexible OSCs in Chapter 4. The PHEMA hydrogel films were optimised via adjusting photopolymerisation duration under UV light. Based on the fabricated PHEMA substrates, flexible OSCs were subsequently made, whose extracted device parameters showed comparable characteristics with …
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Untersuchungen zur Entwicklung einer feldeffektbasierten Biosensoranordnung mit integriertem Referenzsystem
… electrodes were covered with KCl-containing pHEMA or agar as inner electrolyte. The agar membrane of some reference electrodes was additionally covered with different protective layers to reduce the leaching of chloride ions out of the membrane. As protective coatings Nafion, cellulose …
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Development of Polymer-Biomolecule Core-Shell Particles For Biomedical Applications
… of poly(2-hydroxyethyl methacrylate) (pHEMA) were synthesized to evaluate the interaction between proteins and polymers. Our data indicated that the polymers containing pyridine residues can successfully assemble with proteins, and the mechanism is mainly governed by hydrogen bonding …
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The Physical and Spectroscopic Study of a Series of Poly(3-hexyl thiophene) Homopolymers and Poly(3-hexyl thiophene)-block-Poly(2-hydroxyethyl methacrylate) Diblock Copolymers
… methacrylate) (P3HT-b-PHEMA) were also studied. The morphological and spectral changes of these block copolymers were studied at various stages of micelle formation in block selective solvents. The relationship between the volume fraction of the P3HT block and their …
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One-dimensional hybrid nanomaterials based on cylindrical polymer brushes
… CPBs with a poly(2-hydroxyethyl methacrylate) (PHEMA) core and a POEGMA shell were employed for the fabrication of a wormlike assembly of TiO2 semiconductor nanoparticles, forming a kind of titania-CPB hybrid nanowires. The titanium alkoxide precursor was introduced into the CPB via a …
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Photosensitizer Loaded Contact Lenses As An Externally Stimulated Ophthalmic Drug Delivery System
… the initiator of reaction for the formation of pHEMA hydrogel films. This delivery system showed 60% transmittance in the visible light region and 49% moisture content. In absence of laser, the in vitro release of free Eosin Y and Eosin Y loaded liposome from the hydrogel matrix were 24.3 ± 3.5% …
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Self-Assembly of Block Copolymers in External Fields
… (PS-b-PI, PS-b-PMMA, PS-b-PtBMA, PS-b-PHEMA-b-PMMA, PS-b-P2VP). It is found that a high dielectric contrast leads to faster alignment kinetics (e.g. the time constants of the fastest processes for a PS-b-P2VP diblock system in THF are in the range of 0.3 sec) and reduces the threshold …
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The role of community workers in promoting service delivery in Nsikazi North, Mpumalanga
Submitted in fulfilment of the requirements of the degree of Master of Technology in Public Management at the Durban University of Technology, Durban, South Africa, 2024.
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Solid Dispersions in Medium-Insoluble Hydrogels for Enhancing the Solubility and Bioavailability of Poorly Soluble Drugs
… ASDs based on Poly(2-Hydroxyethyl methacrylate) (PHEMA) hydrogel beads. Here, it is shown that one can obtain a more sustained supersaturation either through increasing the particle size of medium-insoluble hydrogels to reduce the rate of supersaturation generation or by lowering the total dose …
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Design and evaluation of neuroregenerative properties of 4D hydrogel scaffolds
… of geometries and a “blank-slate” hydrogel (pHEMA), leads to a means to exert control on the degree of cell-scaffold interactions, and manipulate cell culture development in 4D. The second explores a different class of scaffolds, compressively buckled mesostructures, which can be used as …
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Solid state NMR for advanced materials characterization
… mobile amorphous regions of a series of (PEO-b-PHEMA) diblock copolymers with different molecular weights. Another interesting topic covered was related to biodegradable polymers having shape memory properties. Networks of [(L-lactide)-ran-glycolide]dimethacrylate with potential medical …
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Click Chemistry as Efficient Ligation Strategy for Complex Macromolecular Architecture and Surface Engineering
… wurden mit Poly(hydroxyethylmethacrylat) (pHEMA) gepfropft. Das Aufpfropfen von hydrophilen Polymeren auf hydrophobe Partikel kann die Suspendierungseigenschaften der Partikel im wässrigen Medium deutlich erhöhen. Schließlich wurden Magnetit-Nanopartikel (Fe3O4) mit der Huisgen [2+3] …
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Patterning temporally dynamic 4D hydrogel and nanocomposite material gradients: predictive cellular and actuator responses
… In these, the synthetic hydrogel poly-HEMA (pHEMA) is integrated with its own monomer to prepare a viscous pre-polymer material (pHH) that is amenable to high resolution filament extrusion within a DIW printing platform. pHH extrusion through pulled glass capillary printheads (~30 μm …