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Showing 1 to 20 of 224 for “"polydimethylsiloxane"”.
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Peeling models for polydimethylsiloxane (PDMS)
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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Lubrication Forces in Polydimethylsiloxane (PDMS) Melts
The flow properties of polydimethylsiloxane (PDMS) melts at room temperature were studied by measurement of lubrication forces using an Atomic Force Microscopy (AFM) colloidal force probe. A glass probe was driven toward a glass plate at piezo drive rates in the range of 12 – 120 μm/s, which …
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Hyperbranched And Polydimethylsiloxane Based Membranes For CO2 Capture
<p>As we continue to come to terms with a warming planet created, in part, by our dependence on fossil fueled power plants, there is a great and urgent need for cost effective methods of isolating and capturing greenhouse gasses. Among the many methods currently being explored for CO2 separation, …
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Polydimethylsiloxane-Based Self -Healing Composite and Coating Materials
We demonstrate the bulk self-healing property of a polymer composite composed of a phase-separated PDMS healing agent and a microencapsulated organotin catalyst by chemical and mechanical testing. Another significant research focus is on self-healing polymer coatings which prevent corrosion of a …
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Polydimethylsiloxane Modification of Segmented Thermoplastic Polyurethanes and Polyureas
… with a secondary aminoalkyl functional polydimethylsiloxane (PDMS), which was intended to improve the fire resistance of polyurethane systems. The PDMS oligomer was successfully incorporated into the polyurethane backbone via one step solution polymerization. The effect of PDMS content …
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Synthesis and characterization of polydimethylsiloxane-polyamide segmented copolymers
… or "anchoring" method is feasible. Polyamide-polydimethylsiloxane segmented or block copolymers were found to be suitable "interfacial" agents. They were synthesized by reacting aminopropyl-terminated polydimethylsiloxane (PDMS) oligomers with sebacyl chloride via an interfacial polymerization …
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Synthesis and characterization of polydimethylsiloxane-urea segmented copolymers
A method for the preparation of polydimethylsiloxane-urea (A-B)n segmented or multiblock copolymers has been investigated. These copolymers were synthesized from 4,4¹-diphenylmethane diisocyanate (MDI) and a,ω-bis(aminopropyl)polydimethylsiloxane (PSX) of different molecular weights by solution …
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Synthesis and characterization of polycarbonate-polydimethylsiloxane block copolymers
… for the preparation of bisphenol-A polycarbonate-polydimethylsiloxane multi-block or segmented copolymers have been investigated. The first is a solution reaction which utilized the interaction of a preformed, α,ω-dimethylamino terminated polydimethylsiloxane with a preformed, α,ω-hydroxyl …
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Exploration of large scale manufacturing of polydimethylsiloxane (PDMS) microfluidic devices
… of the current manufacturing process of polydimethylsiloxane (PDMS) parts and the emergence of PDMS use in biomedical microfluidic devices addresses the need to develop large scale manufacturing processes for the fabrication of said devices. Casting PDMS parts is found to be the best mass …
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A study to investigate the persistence of polydimethylsiloxane and to determine the detection of polydimethylsiloxane in a body fluid matrix following Cellmark’s Sperm Elution©
… assault cases when there is an absence of semen. Polydimethylsiloxane (PDMS) is a substance applied as a lubricant by the majority of condom manufacturers worldwide. As the awareness of sexually transmitted infections has amplified immensely over recent years, the number of perpetrators wearing …
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Dynamic testing of polydimethylsiloxane for applications in micro-contact roll printing
… systems can regulate the printing pressure of a polydimethylsiloxane stamp on a polymer sheet, but the technology cannot adequately control the registration of the stamp on the sheet because the precise dynamic mechanical behavior of the polydimethylsiloxane stamp is unknown. The purpose of this …
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A comparison of ultraviolet, thermal, and microwave polymerized acrylamide terminated polydimethylsiloxane
A novel oligomer was synthesized for the purpose of investigating the 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 …
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Tunable and High Refractive Index Polydimethylsiloxane Polymers for Label-Free Optical Sensing
… permissible levels. Chemical sensors using polydimethylsiloxane (PDMS) to extract VOCs with partial selectivity, coupled with label-free optical detection methods based on refractive index, can overcome the limitations of conventional VOC detection methods. A variety of tunable and high …
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Surface Patterning, Electronic Device Fabrication And, Three-Dimensional Self-Assembly Using Polydimethylsiloxane
… technique is herein described for pattering with polydimethylsiloxane (PDMS). This procedure uses a novel ultraviolet zone (UVO) exposure mask, which allows for the photopatterning of UVO modifications of PDMS surfaces. This modification enables the direct photoinitiated patterning of discrete …
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Modeling and control of rapid cure in polydimethylsiloxane (PDMS) for microfluidic device applications
Polydimethylsiloxane (PDMS) is an important thermosetting elastomer for microfluidic devices because it can replicate nano-scale features and form flexible membranes useful for microactuation. PDMS is used extensively in research environments because it is readily available and biocompatible. …
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Mechanical and electrical characterization of carbon Black-doped closed-cell Polydimethylsiloxane (PDMS) foam
Carbon Black-doped Polydimethylsiloxane (CB-PDMS) can be used as a pressure sensing material due to its piezoresistive properties. The sensitivity of such a sensor is in part dependent on the stiffness of the material. A closed-cell CB-PDMS foam is being explored as a possible flexible, …
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Mechanical and electrical properties of carbon nanotubes surface-stamped on polydimethylsiloxane for microvalve actuation
… carbon nanotubes (MWCNT) into the surface of polydimethylsiloxane (PDMS) as a method of creating an electrically actuated, flexible microfluidic valve. Samples of PDMS loaded with various surface loadings of MWCNT on the surface are prepared and tested using a uniaxial tension tester, combined …
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Photo-Thermal Application of a Polydimethylsiloxane Foam Embedded with Carbon Nanoparticles for Interfacial Solar Water Evaporation
… to be addressed urgently. The composites of polydimethylsiloxane (PDMS) and carbon-based materials have attracted intensive research interests over the past several decades owing to its stretchable, non-toxic features which can be applied in various fields such as flexible energy harvesting …
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Structure-property behavior of free radical synthesized polydimethylsiloxane-polystyrene block polymers and polytetramethyleneoxide based ionene elastomers
… behavior of free radical synthesized polydimethylsiloxane (PDMS) - polystyrene and PDMS-styrene derivative block polymers have been studied. The block polymers were provided by Dr. J. V. Crivello from GE. Two different types of segmented polytetramethyleneoxide (PTMO) based ionene …
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Centrifugal casting and fast curing of polydimethylsiloxane (PDMS) for the manufacture of micro and nano featured components
The thermosetting resin polydimethylsiloxane (PDMS) is commonly used to prototype micro and nano featured components. In the field of microfluidics, PDMS-based devices have been used for cell sorting, cell culturing, microbioreactors, DNA sequencing, and immunoassays. In energy-related …
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