2 edition of Corona charging of synthetic polymer films found in the catalog.
Corona charging of synthetic polymer films
T. A. Yovcheva
|LC Classifications||QD381.9.E38 Y68 2009|
|The Physical Object|
|LC Control Number||2010022692|
A corona treatment system in its simplest form can be thought of as a capacitor. Voltage is applied to the top plate which, in the case of corona treatment, would be the electrode (see Figure 2 below). The dielectric portion of the capacitor would be made up of some type of roll covering, air and the substrate (film . Experiments using a structural analog of polymer 2 with carboxylate side chains that do not hydrolyze readily provided support for the view that the disruption of these films occurred as a result of polymer side chain hydrolysis and a resulting change in the net charge of the polymers.
Ultrathin, Organic, Semiconductor/Polymer Blends by Scanning Corona‐Discharge Coating for High‐Performance Organic Thin‐Film Transistors. Hee Joon Jung. gives rise to micropatterned arrays of TIPS‐PEN/polymer films. and Charge Transport, Chemistry of Materials, /cmy, 25, Cited by: Polymer-Based Films Find all the films your company needs to succeed in today’s marketplace. No matter the substrate you need to work with, or the after-effects your customers will be looking for, you can work with Spartech to get it right and help you get ahead of industry g: Corona charging.
This book provides a timely overview of a current state of knowledge of the use of polymer thin film for important technological applications. Polymer thin film book covers the scientific principles and technologies that are necessary to implement the use of polymer electronic device. A wide-ranging and definitive coverage of this emerging field is provided for both academic and practicing Cited by: 5. In contrast, most synthetic polymers have much simpler and more random structures. This fact leads to a molecular mass distribution that is missing in biopolymers. In fact, as their synthesis is controlled by a template-directed process in most systems, all biopolymers of a type (say one specific protein) are all alike: they all contain the Missing: Corona charging.
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Synthetic polymer films are most widely used as materials for the production of stable charged films. This book presents a review of three aspects of synthetic polymer films changes. Synthetic polymer films are most widely used as materials for the production of stable charged films.
This book presents a review of three aspects of synthetic polymer films changes initiated by corona charging, as well as their possible applications. Corona charge at elevated temperature is a more efficient method of polarising stretched P(AN-MA) copolymer films than room temperature charging.
More of the charges are injected deeper into the sample, giving rise to a higher internal field, and thus higher pyroelectric by: 4. Corona charging of polymers Abstract: A review of the corona charging of polymers is presented.
After providing a brief account of the corona discharge process and of its application for charging materials, the paper focuses on the evolution of corona triodes that allow the sample surface potential to be monitored during the charging by: Surface potential decay after negative corona charge deposition has been studied for polypropylene films 50μm thick, over a wide range of decay times and charging voltage (–V).
Account is taken of charge trapping and release at sites both in the surface and in the bulk where trapping can reduce the mobility significantly. The model is particularly applicable to polyethylene films and is used to interpret measurements of surface potential on this polymer after 'instantaneous' charging with by: During corona charging of the films, current flowing through a small, guarded electrode (diameter 2 mm), has been recorded with an electrometer, coupled with a digital oscilloscope.
The results shown below have been filtered; raw data show corona pulses and considerable noise. by: In this work, the charge dynamics characteristics of injection, transport and decay in porous and non-porous polytetrafluoroethylene (PTFE) film electrets were investigated by means of corona charging, isothermal and thermal stimulating surface-potential decay measurements.
The results showed that the initial surface potential, whether positively or negatively charging, is much higher in Cited by: 4. Static charges are generated on the surface of the film as it unwinds from the roll and as it contacts and separates from surfaces such as idler rolls, nip rolls and printing or coating rolls.
Charges exist in two polarities: positive and negative. Surfaces charged to the same polarity will repel each Size: KB. Abstract: Experimental work on charge distributions and charge transport in polymer films is reviewed.
For studying the charge distributions in the thickness dimension, thermal or acoustic techniques are used with resolutions down to /spl sim/1 /spl mu/m. The polymer samples usually are charged with corona, electron beam or thermal by: The corona discharge creates high energy oxygen-containing charged particles, which are accelerated by the electric field of the corona and then interact with the surface of the polymer films.
Firstly, changes in electret surfaces initiated by corona treatment, which. Corona- and Flame Treatment of Polymer Film, Foil and Paperboard.
Werner Eckert Arcogas GmbH Rotweg 24 D Moensheim. Abstract. Corona and flame treatment are a well established methods to improve adhesion on film, foil and paperboard. ZnO nanorods were functionalized with new block copolymers containing a hole transporting moiety in one block and a dye and an anchor system in the second block.
After functionalization, the ZnO nanorods are well dispersible in organic media and the fluorescence of the dye is quenched. Kelvin probe force microscopy was used to measure changes in electrical potential between the ZnO nanorod and Cited by: Introduction.
A corona discharge is a process by which a current flows from an electrode with a high potential into a neutral fluid, usually air, by ionizing that fluid so as to create a region of plasma around the electrode. The ions generated eventually pass the charge to nearby areas of lower potential.
Since polyolefins of polyethylene (PE) and polypropylene (PP) are two of the three most widely used synthetic polymers in the world (7), most of the research on corona treatments of polyolefin films is based on PE and PP films.
Much of what we understand about the corona treatment has been generated within the last twenty-five years. 3 / Contact angle of water droplets on corona-treated polymer film surfaces T pm Static contact angle, 0 (degrees), n - is defined as the angle between the substrate surface and the tangent line drawn to the droplet surface at the three-phase point, when a.
The build up of trapped charge explains a memory effect in which the SHG signal relaxation time gradually increased as the film was subjected to multiple polings. Finally, it is demonstrated that the release of charges trapped in the polymer matrix depends upon the heating rate and continues far above the glass transition temperature of the.
The ability of polymer films to retain inks, coatings, adhesives, etc. is primarily dependent on the character of their surfaces and can be improved by one of several surface-treating techniques. The electrical discharge treatment, such as corona treatment, has been found to increase the wetting tension of a polymer film.
The stronger the treatment, the more actively the surface reacts. Polymer Films continuous layers of polymers up to – mm thick. Thicker layers of polymeric materials are called sheets.
Polymer films are made from natural, artificial, and synthetic polymers. The first group includes films made from proteins, natural rubber, and cellulose. The most common film in this group is cellophane.
A second, larger group Missing: Corona charging. A mathematical formulation and solution of the cophmore inverse problem for helically wrapping polymer corona phases on cylindrical substrates. J Phys. Chem. CCited by:. An electret (formed of electr- from " electricity " and -et from " magnet ") is a dielectric material that has a quasi-permanent electric charge or dipole polarisation.
An electret generates internal and external electric fields, and is the electrostatic equivalent of a permanent magnet. The valuable physical and chemical properties of many solids can be attributed to metallic es include magnetic materials used in data storage, superconductors, electrochromic materials, and catalysts.
It has long been recognized that incorporation of metal atoms into the one-dimensional chains of synthetic polymers may also lead to desirable by: The corona discharge along the field lines and that field lines ending outside 0 65° usually originate on the point surface outside the ionization region.
The Warburg distribution is sketched in Fig. 1. In point-to-plane unipolar current coronas, as well as in wire-cylinder or wire-plane ones, space.