Degradation Mechanisms of Pigmented Coatings PDF Download
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Author: William Buford Campbell
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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Book Description
Author: William Buford Campbell
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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Book Description
Author: William B. Campbell
Publisher:
ISBN:
Category :
Languages : en
Pages : 70
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Book Description
Two different types of polydimethylsiloxane formuated with a rutile titanium dioxide pigment were evaluated as polymeric thermal control coatings. Oxygen permeability, diffusion, and solubility in these coatings were measured for various temperatures. It was noted that diffusion and permeability coefficients decreased as pigment concentration increased. Morphological investigations comparing surface roughness and surface area to the ultraviolet stability of a zinc orthotitanite coating indicated that pigment surface area is directly related to the increase in solar absorptance. (Author).
Author: Michael Diebold
Publisher: Springer Nature
ISBN: 3030990834
Category : Technology & Engineering
Languages : en
Pages : 718
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Book Description
This book discusses the diverse array of particles that are found in coatings from both a physical and a performance standpoint. It also describes the fundamentals of particle behavior and shows how these affect the performance and properties of their end-use applications. It consists of nineteen chapters, demonstrating the wide range of types of particles found in coatings as well as the diversity of the important attributes they hold. The authors also present a forward looking view of current issues and trends in the coatings industry. In addition, a chapter on the use of particles in paper laminate, a closely aligned field, is included. This book is of interest to formulators of any type of coatings as well as researchers in aligned fields that use high volumes of small particles, such as the plastics and paper industries.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 224
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 113
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Book Description
An investigation has been conducted on the mechanisms of degradation of pigments and polymeric coatings for thermal control applications exposed to ultraviolet (uv) and electron irradiation. The materials investigated were rutile (titanium dioxide) and strontium titanate (SrTiO3). The effects of treating the pigments by heating in various gas ambients at elevated temperatures were studied using gas chromatography and electrical conductivity measurements. Significant changes in the surface characteristics were found to result from these treatments. A comparison was made between the reflective degradation in binderless pigments and silicone-binder coatings exposed to uv light, to energetic electrons, and simultaneously to uv light and electrons. Evidence for stabilization of defect sites by charge capture was discovered in the binderless pigment experiments. This mechanism for defect stabilization does not appear as prevalent in the silicone-binder coatings, since the binder apparently passivates the pigment surface to some extent. The fluence dependence of the degradation and the recovery of the damage in vacuum and in the presence of various gas ambients was also studied.
Author: Isao Sekine
Publisher: The Electrochemical Society
ISBN: 9781566771917
Category : Science
Languages : en
Pages : 294
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Book Description
Author: Clive H. Hare
Publisher:
ISBN: 9781889060668
Category : Paint
Languages : en
Pages : 631
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Author: George Wypych
Publisher: Elsevier
ISBN: 1927885329
Category : Technology & Engineering
Languages : en
Pages : 983
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Book Description
Handbook of Material Weathering, Sixth Edition, is an essential guide to the effects of weathering on polymers and industrial products, presenting theory, stress factors, methods of weathering and testing and the effects of additives and environmental stress cracking. The book provides graphical illustrations and numerical data to examine the weathering of major polymers and industrial products, including mechanisms of degradation, effect of thermal processes, and characteristic changes in properties. The book also discusses recycling, corrosion and weathering, and the weathering of stone. This sixth edition updates this seminal work with recent developments and the latest data. Polymers and industrial plastics products are widely used in environments where they are vulnerable to the effects of weathering. Weathering stress factors can lead to deterioration or even complete failure. Material durability is therefore vital, and products for outdoor usage or actinic exposure are designed so that the effects of artificial and natural weathering are minimized. This book is an important reference source for those involved in studying material durability, producing materials for outdoor use and actinic exposure, research chemists in the photochemistry field, chemists and material scientists designing new materials, users of manufactured products, those who control the quality of manufactured products and students who want to apply their knowledge to real materials. - Offers detailed coverage of theory, stress factors and methods of weathering - Provides specific information and numerical data for 52 polymers and 42 groups of industrial products, including characteristic changes and degradation mechanisms - Discusses major additional topics, such as weathered materials for recycling and the interrelation between corrosion and weathering - Provides graphical illustrations and numerical data to examine the weathering of major polymers and industrial products
Author: D. M. J. Compton
Publisher:
ISBN:
Category :
Languages : en
Pages : 99
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Book Description
Progress of an investigation on the mechanisms of degradation of white pigments used in polymeric thermal control coatings by ultraviolet radiation is reported. The materials investigated were rutile (TiO2) with different controlled impurity levels and surface treatments and high-purity strontium titanate (SrTiO3). Apparatus combining a gas chromatograph with means for measuring optical reflectance and electrical conductivity enables samples of pigments to be investigated in a controlled environment. Changes in optical properties, produced by exposure to ultraviolet light, are correlated with gas evolution and adsorption. Some optical changes were correlated with gas evolution and electrical conductivity. The gas evolved in all cases was CO2, with no O2 being observed. Carbonaceous impurities found in these materials are believed to play a role in the damage process. Instrumentation and test techniques were developed, including a recently completed reflectometer of novel design. A comparison was made between chemical reduction of various rutile pigments and the effects of uv light: Chemical reduction produces changes in optical and other properties that correlate with one of the two types of effects produced by uv light (reduction of reflectance near one micron) and the relative susceptibility of different pigments to chemical reductions similar to their relative susceptibility to uv degradation.
