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 67 for “"hyperbranched"”.
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Hyperbranched polyglycerol surfactants: a modular approach
… for industrial and medical applications. Hyperbranched polyglycerols (HPGs) have been employed as a nonionic hydrophilic material with high salt stability. In this work the HPG scaffold has been used to develop a series of different surfactants for use in industrial applications. A series …
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Hyperbranched And Polydimethylsiloxane Based Membranes For CO2 Capture
… possible membranes: composite layer membranes, hyperbranched membranes and dense film membranes. In addition to examining the permeance of each type, the study explored various membrane formation techniques and how that affects the permeability of specific membrane types.</p> <p>The results …
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Core-based hyperbranched polyethyleneimine coating in capillary electrophoresis
… and to modify the selectivity. , core-based hyperbranched polyethyleneimine (CHPEI) polymer utilized as either a static or dynamic coating in this study. A CHPEI-coated capillary was simply constructed in a rinsing fashion or by adding a small amount of CHPEI in a running buffer. In …
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Molecular Modeling Studies of Dendrimers and Hyperbranched Polymers
… and rheological dynamics of dendrimers and hyperbranched polymers is investigated. Non-Equilibrium Brownian Dynamics (NEBD) simulations are utilized to investigate the single-molecule behavior in the dilute solution and the Tube Model is utilized to investigate the dynamics in the entangled …
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Synthesis and applications of core functional hyperbranched polyglycerol
… the synthesis of a new alkyne core functional hyperbranched polyglycerol and describes their use as potential monomolecular imprinting materials and increasing the photostability of fluorescent dyes. The first chapter describes two methods for the synthesis of the polymers and its formal [3+2] …
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Amphiphilic hyperbranched polyglycerols for industrial and biomedical applications
Hyperbranched polyglycerols (HPGs) are a versatile and biocompatible class of polymers that have garnered considerable attention within the scientific community, because of their facile synthesis and chemical adaptability. HPGs are used in a number of areas of research, including live cell …
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Synthesis and characterization of hyperbranched poly(urea-urethane)s
The thesis aims to synthesize hyperbranched poly(urea-urethane) polymers (HPU) in one-pot method using commercially available monomers which are 2,4-toluylene diisocyanate (TDI) as aromatic diisocyanate and isophorone diisocyanate (IPDI) and 2(3-isocyanatopropyl) cyclohexylisocyanate (IPCI) as …
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Hyperbranched Aromatic Polyesters and Their Application in Blends of Linear Polyamides
In the last two decades, hyperbranched (hb) polymers have drawn much attention and obtained intensive research activities both from industry and academia. They are known to have unique and interesting properties which derive from their three dimensional structure and the large number of functional …
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Chromophore Arrays Based on Rigid Dendritic, Hyperbranched and Tetrahedrally Branched Architectures
Two tetrapodal structures containing four rigid arms incorporating anthracene chromophores were synthesized. Amorphous and luminescent properties of these compounds were characterized by thermal analysis and fluorescence spectroscopy.
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End-Group Modified Hyperbranched Polyetherimides and Their Blends With Linear Polymers
When used as a modifier for melt-processed blends, the HBP domain size was based upon end-group composition and Tg. Increasing the length of alkyl chain increased compatibility with a polyolefin matrix (PE). While no processing advantage was observed by the incorporation of HBPs, polyethylene tapes …
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Hyperbranched polyesters for polyurethane coatings: their preparation, structure and crosslinking with polyisocyanates
In this work, hyperbranched aromatic polyesters-polyphenols based on 4,4-bis(4’ hydroxy¬phenyl)pentanoic acid (BHPPA) were prepared and, according to the authors knowledge, for the first time tested as precursors for polyurethane bulk resins and coatings. Comparison of poly-BHPPA with competing …
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Hyperbranched polymers and Haag type dendrimers for the molecular imprinting of polymers
… imprinted polymer was synthesized using both hyperbranched polyglycerol and Haag type polyether dendrons with estradiol as a core. The attachment of the polyether dendron created a dendrimer that had 64 allyl groups available for crosslinking. Completion of the crosslinking of the dendrimer …
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Nanostructured thermoset resins and nanocomposites containing hyperbranched blockcopolyether liquid rubbers and organophilic layered silicates
… of the organophilic silicate particles. <br>Hyperbranched blockcopolyethers with nanometer size and core/shell type topology were prepared as a new class of liquid rubbers. Subsequent modification yielded hydroxy, phenol and glycidyl end groups. A high compatibility with the matrix resin …
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Design, synthesis and characterization of fluorescent hyperbranched polyglycerols and organic nanoparticles with covalently bound anti-fading agents
… and anti-fading agent (AFA) moieties to hyperbranched polyglycerols (HPG). The use of HPGs as a scaffold to link fluorescein and anti-fading agents proved intractable, so a norbornyl based ROMP polymer was used instead. Through the iterative use of ROMP and RCM, organic nanoparticles …
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Synthesis and Characterization of Branched and Hyperbranched Polyetherimides and Selective Chemistry on the Nanolithographically Defined Silicon(100) Surface
"Part II of this thesis describes studies regarding spatially defined, area selective chemistry on the Si(100)-2 x 1 surface. Using the tip of a scanning tunneling microscope (STM) as a localized electron beam, hydrogen can be site selectively removed from the hydrogen-terminated Si(100)-2 x 1 …
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