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Showing 1 to 20 of 51 for “"Polyethylene oxide"”.
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An investigation into the structure and properties of polyethylene oxide nanocomposites
… and electrical properties of poly(ethylene oxide) systems. The initial objective is to investigate the extent to which dispersion of nanofillers and effect of host molecular weight can be inferred from rheological analysis. This investigation covers many systems based upon polyethylene oxide …
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A study of polyethylene oxide-polysiloxane networks as biomaterials for drug release
Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1989.
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A study of the effects of velocity profile development and polyethylene oxide addition on liquid jet stability
Massachusetts Institute of Technology. Dept. of Chemical Engineering. Thesis. 1967. B.S.
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A study of long time behavior of aqueous solution of polyethylene oxide (Peo) and aqueous salt (potassium sulfate) solution of Peo using dynamic light scattering
… time behavior of dilute aqueous solutions of polyethylene oxide (PEO) and the properties of dilute aqueous salt (K{dollar}\sb2{dollar}SO{dollar}\sb4{dollar}) solutions of PEO by using the dynamic light scattering technique; The long time study measurement results indicated that the values of …
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Hot-melt extrusion as processing technique for multiparticulate dosage forms containing lipophilic and hydrophilic polymers
… of the hydrophilic polymer (i.e. xanthan gum and polyethylene oxide).
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Effect of Process Parameters and Material Attributes on Crystallisation of Pharmaceutical Polymeric Systems in Injection Moulding Process. Thermal, rheological and morphological study of binary blends polyethylene oxide of three grades; 20K, 200K and 2M crystallised under various thermal and mechanical conditions using injection moulding
… to suite a specific need. Three grades of pure polyethylene oxide; 20K, 200K and 2M, were first characterised using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD) and shear rheometry. The onset of degradation and the rate varied …
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Presentation and accessibility of surface bound ligands on amphiphilic graft copolymer films
… methacrylate) (PMMA) backbone and short, polyethylene oxide (PEO) side chains, PMMA-g-PEO, are proposed to self-organize at the polymer/water interface, resulting in quasi-2D confinement of the backbone at the immediate surface. The branched architecture and amphiphilic chemistry of these …
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Self-assembly of linear-dendritic diblock copolymers
… here consists of 2000 molecular weight linear polyethylene oxide (PEO) with a polyamidoamine (PAMAM) dendron covalently bonded to one chain end. Specular neutron reflectivity has been used to investigate the structure of monolayers formed at an air-water interface. The dendritic end groups were …
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Rheology and Microstructure of Filled Polymer Melts
… dispersions are studied in low molecular weight polyethylene oxide (PEO), polyethylene oxide dimethylether (PEODME), and polytetrahydrofuran (PTHF). Scattering measurements of the particle second virial coefficient in PEO melts indicates repulsive particles by a value slightly greater than unity. …
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Synthesis and characterization of high Tg nanofoams based on pyromellitic dianhydride and 1,1-bis(4-aminophenyl)-1-phenyl-2,2,2-trifluoroethane polyimide block and graft copolymers
… labile con1ponents (especially polypropylene oxide), have been prepared and investigated as low dielectric materials that afford desirable thermal, mechanical and electrical properties. Polyimide nanofoams based upon the controlled pyrolysis of the labile component were prepared. The …
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Poly(Ethylene Oxide)/Graphene Oxide Polymer Nanocomposite Electrolyte for Lithium Ion Batteries
… polymer electrolytes. In this study, graphene oxide (GO) nanosheets were used as nanosized fillers in polyethylene oxide (PEO) electrolyte. We demonstrated that about an order of magnitude improvement in lithium-ion conductivity, as high as 10-4 S/cm at room temperature, was achieved with GO …
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Polymer-induced turbulence modifications in an impinging jet
… both plain water and dilute polymer solutions of polyethylene oxide at concentrations of 50 and 100 ppm. The mean and turbulence characteristics of these three flows are contrasted and it is observed that the 50 ppm case yields a slight enhancement of the turbulence while the 100 ppm case exhibits …
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The effect of zero point charge environment on rock fracture behavior
… of aluminum chloride, calcium chloride and polyethylene oxide, all at ZPC conditions. These rocks were also tested in atmospheric air and distilled deionized water. For every rock type, the results obtained for the tests done in each of the ZPC environment were statistically compared with …
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Contraction/expansion flow of dilute elastic solutions in microchannels
… fluids. Dilute viscoelastic aqueous solutions of polyethylene oxide are passed through 16:1 planar micro-contractions. Fluids exhibit substantial elastic behavior marked by elastic instabilities followed by subsequent lip vortices and eventually stable vortex growth. The onset of flow …
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Synthesis and Structure-Property Relationships of Polysaccharide-Based Block Copolymers and Hydrogels
… responsive hydrogels by using a Jeffamine, a polyethylene oxide-b-polypropylene oxide-b-polyethylene oxide triblock copolymer with two terminal amines. As the Jeffamine has a lower critical solution temperature, oxidized hydroxypropyl cellulose/Jeffamine hydrogels display moduli that are …
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Electrospinning of biphasic biopolymer and polymer : a feasibility and characterization study
… When collagen is combined with polymer, Polyethylene Oxide (PEG), the fiber diameters ranged from 150nm to one micron. The fibers produced have shown drastic phase separation. The next study involved using a duel solvent system to electrospin fibers. The polymer of choice is Poly …
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Biomimetic composite structure to simulate tendon performance
… Estane 5714 F5P. A polyamide (Nylon 6-6), a polyethylene terephthalate (Dacron) and a block copolymer of polyethylene oxide and aromatic polyurethane (Lycra) were used as the straight fiber reinforcement A crimped Nylon 6 fiber was obtained in order to simulate the crimp in natural tendon. …
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Studies on Structure and Property of Polymer-based Nano-composite Materials
… <p>The first type of composites is titanium dioxide/ polyaniline combination. The effects of 4 different doping-acids on the microstructure, morphology, thermal stability and thermoelectric properties were discussed, showing that the sample with HCl and sulfosalicylic dual acids gave a better …
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Mechanical characteristics of organically modified fly ash-kaolinite mixtures
… and Xanthan gum) and synthetic polymers (Polyethylene Oxide, PEO) were used instead of the traditional stabilizers to improve the engineering behaviors of fly ash-kaolinite mixtures. The effects of polymers on microstructure development and geotechnical properties (i.e., stiffness, …
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Studies of physical properties of novel lithium polymer electrolytes.
… natural rubbers and modified natural rubbers/polyethylene oxide polymer hosts have been investigated. Three types of modified natural rubber, namely 2S percent epoxidised natural rubber (ENR2S), SO percent epoxidised natural rubber (ENRSO) and polymethyl methacrylate grafted natural rubber …
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