Polycarbonate

About: Polycarbonate is a research topic. Over the lifetime, 14032 publications have been published within this topic receiving 141740 citations. The topic is also known as: PC & Polycarbonate, PC.

Curved polarizing sheet protected with polycarbonate and process for producing the same

Abstract: A process for producing a curved polarizing sheet having a polycarbonate protective layer, which comprises laminating a polycarbonate film or sheet on both sides of a polarizing film comprising a high polymer film containing an orientated dichroic dye to prepare a polarizing laminate and forming the polarizing laminate so as to have a curved surface while heating at a temperature ranging from 120°C to a temperature higher than the glass transition temperature of the polycarbonate by 30°C and applying a force of 1.2 Kg/cm² or less to the polarizing laminate before the heating temperature reaches the glass transition temperature of the polycarbonate; and a product obtained thereby are disclosed. The curved polarizing sheet is free from optical strain and excellent in impact strength.

Ionomer resin films and laminates thereof

Abstract: The present inventions teaches an optically transparent film or sheet which is greater than or equal to 0.5 mm in thickness and includes an extrudable ionomer resin which comprises a carboxylic acid polymer and which is essentially free of amines. The ionomer resin film can be used alone or in a lamination with polycarbonate or glass. In certain embodiments, it is preferable to partially or fully neutralize the acid polymer with a metal cation.

Fabrication of a paraffin actuator using hot embossing of polycarbonate

Abstract: In this paper a fabrication process for integrating paraffin-actuated structures in polycarbonate is outlined. A paraffin-actuated membrane with a diameter of 2.5 mm, where the volume expansion of 10–15% associated with the solid-to-liquid phase transition of paraffin is utilized, has been fabricated and evaluated. Microstructures fabricated in silicon have via an electroplated nickel mould been replicated in polycarbonate by hot embossing and the resulting structures have been sealed by thermal bonding. The bonding strength was measured by a pressurizing test, and the polycarbonate surfaces were characterized with electron spectroscopy for chemical analysis (ESCA). It was found that the bond strength increased when an oxygen plasma treatment was used prior to bonding. ESCA measurements showed a corresponding increase in oxygen content on the plasma treated surfaces. This procedure also improved the wetting properties. The contact angle between paraffin and polycarbonate decreased from 10° after embossing to about 5° after plasma treatment. The fabricated actuator had a total thickness of 1 mm and the membrane deflected about 140 μm when heating the actuator above the melting point of paraffin. Paraffin wax actuators are possible to integrate in plastic structures making them promising candidates in applications such as disposable microfluidic systems where inexpensive and robust valves and pumps are needed.

Electrospinning of polycarbonate nanofibers with solvent mixtures THF and DMF

Abstract: The current work demonstrates the electrospinning of polycarbonate dissolved in solvent mixtures of tetrahydrofuran (THF) and dimethylformamide (DMF) to obtain fibers on a nanoscale. The solvent mixtures played a significant role on the morphology of the fibers. The spun fibers showed the characteristics of strong networking with each other as the THF ratio was increased in the solvent mixtures (like 60:40, 70:30 of THF:DMF). The electrostatic voltage, viscosity and surface tension also showed major effects on the fiber morphology and formation of beads. At lower THF and DMF ratios and lower spinning voltages, the bead revealed a globular mushroom shape, while at higher ratios and higher voltages, the beads formed the shape of spindle. The microstructures of the electrospun polycarbonate fibers were quantitively investigated by Scanning Electron Microscope (SEM) and Transmission Electron Microscope as a function of processing variables.