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 29 for “"random copolymer"”.
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Honeycomb structured porous films from different polymer architectures - preparation, mechanism, analysis and post-treatment
… ranging from linear, comb, star polymers and a random copolymer. Four casting methods were designed and applied for the production of structured porous materials. The airflow casting technique, cold-stage casting technique, casting on water technique and emulsion casting technique all based in …
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Synthesis and Characterization of Hydrophobic-Hydrophilic Multiblock Copolymers for Proton Exchange Membrane and Segmented Copolymer Precursors for Reverse Osmosis Applications
… to synthesize hydrophobic-hydrophilic multiblock copolymers with high Ion exchange capacity (IEC) values to ensure sufficient ion channel size. In this thesis two multiblock systems were synthesized incorporating trisulfonated hydrophilic oligomers and were characterized in the first two chapters …
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Synthesis and Characterization of Disulfonated Poly(Arylene Ether Sulfone) Random Copolymers as Multipurpose Membranes for Reverse Osmosis and Fuel Cell Applications
… of several disulfonated poly(arylene ether) random copolymer membranes in fuel cell and reverse osmosis applications. Poly(arylene ether)s were prepared by direct step copolymerization using a third monomer 3,3–-disulfonated 4,4–-dichlorodiphenylsulfone. The membrane properties of a …
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Adsorption of Novel Block Copolymers for Steric Stabilization and Flocculation of Colloidal Particles in Aqueous Environments
… are useful in designing a brush forming block copolymer with the GLU acting as the anchor block and the PRO as the tail block. An important finding in this work is that these unstructured polypeptides, or proteins that only have primary and secondary structure, have adsorption behavior that is …
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Thermodynamic Interactions in Polydiene/Polyolefin Blends
… ethylene) (PEE), polyethylene (PE), PE-co-PEE random copolymers, and poly(ethylene-alt-propylene) (PEP). Additionally, a model atactic polypropylene (aPP) prepared using a metallocene catalyst was used in this study. SANS data were interpreted using Zimm analysis and the Random Phase …
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Synthetic polypeptide-based hydrogel systems for biomaterials
… are introduced. Additionally, a new random copolymer, poly(y-propargyl-L-glutamate-co-[gamma]-allyl-L-glutamate) (PPALG) is presented that exploits both the azide-alkyne and thiol-ene click reactions to allow orthogonal side chain modification to increase chemical complexity and …
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Studies and Optimization of All-Polymer Solar Cells based on Naphthalene Diimide-Biselenophene Copolymer Acceptors
… based on naphthalene diimide-biselenophene copolymer acceptors and aims to better understand the relationship between photovoltaic properties, blend morphology, and device processing variables. In this study, we found that optimal thermal annealing and use of a processing additive …
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Synthesis and Characterization of Hydrophilic-Hydrophobic Disulfonated Poly(Arylene Ether Sulfone)-Decafluoro Biphenyl Based Poly(Arylene Ether) Multiblock Copolymers for Proton Exchange Membranes (PEMs)
Hydrophilic/hydrophobic block copolymers as proton exchange membranes (PEMs) has become an emerging area of research in recent years. Three series of hydrophilic/hydrophobic, fluorinated/sulfonated multiblock copolymers were synthesized and characterized in this thesis. These copolymers were …
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Bottlebrush Polymers: A Pathway to Engineering Surfaces and Interfaces
… the phase behavior of bottlebrush polymers with random copolymer poly (styrene-r-methyl methacrylate) side-chains in a blend of two immiscible homopolymers, polystyrene and polymethyl methacrylate. We determined that bottlebrush composition and architecture will control the morphology of the …
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Controlling the assembly of proteins and cells on SiO₂ surfaces
… a surface. Two systems were examined: 1) graft copolymers of poly(acrylic acid) expressing PEG-containing side chains, and 2) a random copolymer composed of an "anchor part" (trimethoxysilane) and a "functional part" (PEG). In the first system, PEG-containing films were formed by an …
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Durability study of proton exchange membrane fuel cells via experimental investigations and mathematical modeling
… and sulfonated poly(arylene ether sulfone) random copolymer (BPSH35) membranes is explored under ambient conditions, with respect to the effects of initial strain rate, counterion type, molecular weight and the presence of inorganic fillers. A three-dimensional "bundle-cluster" model is …
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Synthesis and Characterization of Multiblock Copolymer Proton Exchange Membranes for High Temperature Fuel Cell Applications
… In this dissultation, novel multiblock copolymers based on disulfonated hydrophilic-hydrophobic multiblocks were synthesized and investigated for their potential application as PEMs. The relationship between copolymer chemical composition and resulting properties was probed with a …
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Synthesis and Characterization of Linear and Crosslinked Sulfonated Poly(arylene ether sulfone)s: Hydrocarbon-based Copolymers as Ion Conductive Membranes for Electrochemical Systems
… poly(arylene ether sulfone)s as ion conductive copolymers have numerous potential applications. Membranes cast from these copolymers are desirable due to their good chemical and thermal stability, excellent mechanical strength, satisfactory conductivity, and excellent transport properties of …
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Understanding Structure-Property Relationships for Impact Polystyrene
… 5 wt% total polybutadiene, styrene-butadiene copolymer concentration varied between 5-15 wt% of the polybutadiene. Bulk viscosity behavior was measured at 50 °C ranging in shear rate from 100 s-1 to 1000 s-1. The effect of block copolymer and random copolymer compatibilizers on controlling the …
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Statistical mechanical theory of structure and miscibility of polymer nanocomposites: Effects of density, filler shape, and chemical heterogeneity
… scattering results. Also discussed briefly are copolymers composed of two types of monomer which interact differently with the filler. The polymer induced depletion attraction is dominant and causes phase separation if interfacial attractions are weak. Complete miscibility can be achieved at …
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Transport and Anisotropy inside Ionic Polymer Membranes
… sulfone) hydrophilic-hydrophobic multi-block copolymers to polymer blends to perfluorosulfonate random copolymers. For the multi-block copolymers, NMR diffusion measurements yield diffusion anisotropy as a function of water uptake and block lengths. ²H NMR spectroscopy on absorbed D₂O probes …
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Synthesis of Amphiphilic Block Copolymers for Use in Biomedical Applications
… on the synthesis of three amphiphilic block copolymer systems containing poly(ethylene oxide) (PEO) blocks. The polymer systems were developed for use in biomedical applications. The first of these is a series of poly(ethylene oxide-b-oxazoline) (PEO-b-POX) diblock copolymers for use in the …
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Functional polymer layers with protected amines
… click chemistry was used to produce well-defined random copolymer. It could already be shown that also block copolymers can be prepared which give the chance to combine nanostructure formation in block copolymers with special functionality. Thus, the special properties of these functional polymers …
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Synthesis and characteristics of polyarylene ether sulfones
… can limit its scope for the synthesis of block copolymers. An alternate route using potassium carbonate/dimethyl acetamide as base and solvent respectively has been cited in the patent literature. We have used this method for the synthesis of several homopolymers and copolymers derived from …
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Tailored Architectures of Ammonium Ionenes
… elastomers are discussed. Water-soluble random copolymer ionenes were synthesized using the Menshutkin reaction from 1,12-dibromododecane, N,N,Nâ ²,Nâ ²-tetramethyl-1,6-hexanediamine, and 1,12-bis(N,N-dimethylamino)dodecane. The absolute molecular weights were determined for the first …
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