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Showing 1 to 20 of 61 for “"Poly(dimethylsiloxane)"”.
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Poly(dimethylsiloxane)-Based Microfluidic Electrochemical Devices
In another application, the devices can be operated as passive microfluidic fuel cells incorporating high surface area/porous metal and metal alloy electrodes that are embedded and fully immersed in liquid electrolyte confined in the channels of a PDMS-based microfluidic network. A hydrogen-air …
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The determination of hemocompatibility of a geometrically-altered poly(dimethylsiloxane) surface
… test whether a geometrically altered surface of Poly(dimethylsiloxane), or PDMS, was found to be more or less hemocompatible than a flat, unaltered film of PDMS. In this case, the alteration was the addition of micron-scale posts sticking perpendicular to the surface, creating a superhydrophobic …
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Synthesis and Characterization of Cycloaliphatic and Aromatic Polyester/Poly(dimethylsiloxane) Segmented Copolymers
Linear thermoplastic polyesters are commonly used in high volume applications such as food containers, films and textile fibers. The physical and mechanical properties of these materials are well documented and are a function of chemical structure and morphology (e.g. semi-crystalline, amorphous, …
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Synthesis of Functionalized Poly(dimethylsiloxane)s and the Preparation of Magnetite Nanoparticle Complexes and Dispersions
Poly(dimethylsiloxane) (PDMS) fluids containing magnetite nanoparticles stabilized with carboxylic acid-functionalized PDMS were prepared. PDMS-magnetite complexes were characterized using transmission electron microscopy, elemental analysis, and vibrating sample magnetometry. PDMS-magnetite …
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Synthesis and characterization of perfectly alternating segmented copolymers comprised of poly(dimethylsiloxane)s and engineering thermoplastics
Novel perfectly alternating segmented copolymers containing imide junction points were synthesized via terminal amine-anhydride coupling from poly(dimethylsiloxane)s and either poly(arylene ether)s or polyimides. The copolymers were characterized in solution and the solid state. The -(-A-B-)-n …
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Effects of silica nanoparticle surface treatment and average diameter on the physical and mechanical properties of poly(dimethylsiloxane)-silica nanocomposites
… diameter on various macroscopic properties of poly(dimethylsiloxane)-silica nanocomposites, specifically stiffness, wettability, and permeability to organic solvents. Poly(dimethylsiloxane)-silica nancomposites were prepared with constant amounts (4.8 wt%, 1.8 vol%) of fumed silica …
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Synthesis and characterization of novel polyester/polysiloxane and polyester/arylphosphine oxide copolymers
Novel, high molecular weight poly(dimethylsiloxane) / cycloaliphatic polyester segmented copolymers were prepared and characterized. Specifically, polyesters based on dimethyl 1,4-cyclohexane dicarboxylate and 1,4-butanediol were employed. The copolymers were synthesized via a melt process using a …
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Gas permeability of polyimide/polysiloxane block copolymers
A series of perfectly alternating polyimide/ poly(dimethylsiloxane) microphase separated block copolymers ranging from 0-50 wgt. % poly(dimethylsiloxane) have been measured for permeability characteristics. The polyimide segment of the copolymers was based on oxydiphthalicdianhydride (ODPA) and …
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Passive, Self-Healable, Dielectric Elastomers for Structural Health Monitoring
… synthesizes an intrinsically self-healing poly(dimethylsiloxane) via a supra-molecular network of multi-strength hydrogen bonds. The modified poly(dimethylsiloxane) network must be effective in harsh environments, particularly extremely low temperatures, as well as retain the dielectric …
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A comparison of ultraviolet, thermal, and microwave polymerized acrylamide terminated polydimethylsiloxane
… effects of ultraviolet, thermal, and microwave polymerization. The synthesis involved an anionic ring-opening equilibration reaction to produce poly(dimethylsiloxane) which was then endcapped with an acid chloride to result in a material which was linear, flexible, had a functionality of four, …
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Synthesis of Silicone Magnetic Fluids for Use in Eye Surgery
… cobalt nanoparticles have been prepared in poly(dimethysiloxane) (PDMS) carrier fluids in the presence of poly[dimethylsiloxane-b-(3-cyanopropyl)methylsiloxane-b-dimethylsiloxane] (PDMS-PCPMS-PDMS) triblock copolymers as steric stabilizers. A series of the polysiloxane triblock copolymers …
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Polydimethylsiloxane Containing Block Copolymers: Synthesis and Characterization of Alternating Poly(Arylene Ether Phosphine Oxide)-B-Siloxane and Segmented Nylon 6,6 -B-Siloxane Copolymers
… siloxane containing, organic-inorganic block copolymers were prepared using different synthetic approaches. The first copolymers were alternating poly(arylene ether phosphine oxide)-poly(dimethylsiloxane) systems, prepared via oligomeric silylamine-hydroxyl reactions. Secondly, segmented nylon …
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Complexation of Block Copolysiloxanes with Cobalt Nanoparticles
Poly(dimethylsiloxane-b-methylvinylsiloxane) (PDMS-b-PMVS) diblock copolymers were synthesized via anionic living polymerization with controlled molecular weights and narrow molecular weight distributions. Targeted molecular weights agreed well with experimental values determined by 1H NMR, 29Si …
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Surface Characterization of Siloxane, Silsesquioxane, and Maleic Anhydride Containing Polymers at Air/Liquid Interfaces
… In particular, the phase behavior of polyhedral oligomeric silsesquioxanes (POSS) was examined using a combination of LB and Brewster angle microscopy (BAM).Polymer fillers have been shown to reduce the cost and often improve the properties of high performance polymer composites. The …
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Synthesis, characterization and kinetic investigations of heterophase materials prepared using group transfer polymerization
The impact of multiphase polymeric materials has been enhanced by the preparation of well defined block and graft copolymers. Hence, there has been a growing emphasis on new synthetic methods for the preparation of blocks and grafts. Group Transfer Polymerization (GTP) is a relatively new synthetic …
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Morphological effects on gas transport through poly(methylmethacrylate)-poly(dimethlysiloxane) graft copolymers and instrumentation for their synthesis and permeability characterization
… well-defined or "model" block and graft copolymers have received increasing interest among academic and industrial communities. The well-defined nature of such polymers makes them ideal subjects for both fundamental studies and specialty polymer applications. This study addresses the …
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Synthesis of well-defined single and multiphase polymers using various living polymerization methods
Hexenyl functionalized poly(dimethylsiloxane) and methacryloyloxy functionalized poly(methyl methacrylate) (PMMA) and poly(dimethylsiloxane) (PDMS) macromonomers were synthesized using living polymerization techniques. The PDMS macromonomers were prepared by the anionic ring-opening polymerization …
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Water ingression into poly(imide-siloxane)s
… of water vapor with the surface and bulk of poly(imidesiloxane) copolymers has been characterized in an attempt to determine the important factors in the copolymer's resistance to water ingression. The multi-block copolymers were synthesized from benzophenone tetracarboxylic dianhydride, …
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Design and fabrication of a microfluidies gradient generator system for high-throughput molecular interaction studies
… mammalian cells patterned and seeded under its poly(dimethylsiloxane) (PDMS) channels. Cells that were seeded and patterned under the PDMS channels remained viable and capable of performing intracellular reactions. Using the gradient generator within the PDMS microfluidic device, a gradient of …
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Mapping crossing myofiber populations with Diffusion Spectrum Imaging in simulated and microfabricated model tissues
… resolve the geometry of aligned channels in poly(dimethylsiloxane) (PDMS) microfluidic phantoms.
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