Download or read book Plasma Polymerized Coatings for Wear Resistance of Polyurethane written by Jing Guo and published by . This book was released on 1998 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma Polymerized Coatings for Improved Corrosion Resistance written by Yang Zhou and published by . This book was released on 2018 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tens of billions of dollars are spent on corrosion problems every year in the US by the Department of Defense alone. Polymer coating systems are widely used for protecting the metal by preventing water transport through the coating and contact with the metal. Due to the environmental hazards associated with hexavalent chromium and volatile organic contents from traditional polymer coating systems, there is an urgent need to develop new types of coatings. These concerns have drawn attention to ecologically friendly coatings deposited with vapor deposition techniques like plasma enhanced chemical vapor deposition (PECVD). In this work, we not only have developed plasma polymerized (pp) coatings for improved corrosion resistance, but also have characterized their structures and properties with various techniques. Firstly, we started with plasma polymerized coatings from well-established vacuum based PECVD to understand their water resistance and corrosion resistance. An Al panel coated with plasma polymerized maleic anhydride (pp-MA) corroded after one day in salt spray, while a similarly thin (~30 nm) plasma polymerized hexamethyldisiloxane (pp-HMDSO) coating protected an Al panel for a period on the order of one month. The behavior seen with macroscopic tests was consistent with nanoscale characterization with Neutron Reflectivity and Sum Frequency Generation Spectroscopy that showed slow water penetration through a pp-HMDSO coating and water accumulation at the pp-MA/substrate interface. In addition, off specular X-ray measurement showed that the interfacial water disrupted the conformality of the pp-MA coating with the substrate. Secondly, we used plasma polymerized coatings as primer to improve the corrosion resistance of a whole coating system. Both electrochemical impedance spectroscopy (EIS) measurements and salt spray tests showed that using a thin pp-HMDSO coating as a primer under a polyurethane (PU) topcoat can increase the corrosion resistance by a factor of 10 times over that for a PU topcoat directly on an Al panel. The poorly adhesion to the topcoat with hydrophobic pp-HMDSO can be improved with gradient coatings using surface modification of the pp-HMDSO coating. The coatings with plasma polymerized primers showed better corrosion resistance than those of PU on Al and PU on chromate treated Al after 1-month, 3-month and 6-month field tests in a harsh seashore environment in Hawaii. Thirdly, we modified surface fluctuations of polymer melt films by modifying the substrate surface with PECVD. The surface fluctuations of polystyrene thin film with thickness around 3 Rg on pp-MA modified silicon substrate showed less confinement than did similarly thick films on bare silicon. There was no confinement for either case when film thickness was larger than 4 Rg. The difference in confinement was related to the different strongly adsorbed layers on the different substrates. The surface of a polystyrene thin film with thickness around 4 Rg on a pp-HMDSO modified silicon substrate showed faster fluctuations and cannot be described with the HCT theory. This could due to slip at the interface between PS and pp-HMDSO. Finally, we developed plasma polymerized organic coatings deposited in air using atmospheric pressure PECVD (APPECVD). A coating from the same precursor, HMDSO, deposited at atmosphere with APPECVD was hydrophilic and inorganic in character. Using the low oxygen content monomer tetramethylsilane or hexamethyldisilazane, we successfully developed hydrophobic coatings with higher relative carbon contents.
Download or read book Polyurethanes for coatings written by Manfred Bock and published by . This book was released on 2001 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coatings Tribology written by K. Holmberg and published by Elsevier. This book was released on 1994-07-15 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a general view on thin surface coatings used for tribological applications and it is based on the current state of understanding. The mechanisms of friction and wear in sliding and rolling contacts of coated surfaces are described. Basic information on coating techniques, tribology and surface mechanisms is given. Based on collected experimental works information is given on the properties of thin soft coatings, such as polymer, lamellar solid and soft metal coatings; thin hard coatings, such as nitride, carbide, oxide, boride and diamond and diamond-like coatings; and multi-component and multi-layer coatings. The influence of interface layers and lubricants is highlighted. The methods available for characterization of coated surfaces and for mechanical and chemical evaluation of their tribological properties are described. Tribological evaluation methods for accelerated and field testing and the need for standardization of quality assurance procedures are discussed. A methodology for the selection of thin coatings for tribological applications is presented and knowledge based expert system approaches for coating selection are reviewed. For different application examples, the basic tribological contact mechanisms are described and the possibilities for improving their tribological properties by using surface coatings are discussed. The application examples include sliding and rolling bearings, gears, tools for cutting and forming, erosion resistant applications, magnetic recording systems and bio-medical implants.
Download or read book Polymer Surface Characterization written by Luigia Sabbatini and published by Walter de Gruyter GmbH & Co KG. This book was released on 2022-01-19 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: This fully updated edition provides a broad approach to the surface analysis of polymers being of high technological interest. Modern analytical techniques, potential applications and recent advances in instrumental apparatus are discussed. The self-consistent chapters are devoted to techniques from photoelectron spectroscopy to electron microscopies and wettability.
Download or read book Hydrophilic Polymer Coatings for Medical Devices written by Richard J. LaPorte and published by Routledge. This book was released on 2017-11-01 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new text provides a practical guide to hydrophilic polymer coatings technology for applications in a wide range of medical materials and devices. It concisely provides both the scientific basics of this class of polymers and the up-to-date information needed for product development and evaluation, processing, manufacturing, and regulatory compliance. More than fifty schematics illustrate materials, processes, and equipment. The entire presentation is oriented to the practical needs of personnel involved in product development and evaluation, process engineering, and manufacturing management.
Download or read book Ultrasmooth Plasma Polymerized Coatings for Laser fusion Targets written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Coatings for laser fusion targets were deposited up to 135 .mu.m thick by plasma polymerization onto 140 .mu.m diameter DT filled glass microspheres. Ultrasmooth surfaces (no defect higher than 0.1 .mu.m) were achieved by eliminating particulate contamination. Process generated particles were eliminated by determining the optimum operating conditions of power, gas flow, and pressure, and maintaining these conditions through feedback control. From a study of coating defects grown over known surface irregularities, a quantitative relationship between irregularity size, film thickness, and defect size was determined. This relationship was used to set standards for the maximum microshell surface irregularity tolerable in the production of hydrocarbon or fluorocarbon coated laser fusion targets.
Download or read book Nanotoxicity written by Susai Rajendran and published by Elsevier. This book was released on 2020-04-09 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotoxicity: Prevention, and Antibacterial Applications of Nanomaterials focuses on the fundamental concepts for cytotoxicity and genotoxicity of nanomaterials. It sheds more light on the underlying phenomena and fundamental mechanisms through which nanomaterials interact with organisms and physiological media. The book provides good guidance for toxic prevention methods and management in the manufacture/application/disposal. The book also discusses the potential applications of nanomaterials-based antibiotics. The potential toxic effects of nanomaterials result not only from the type of base materials, but also from their size/ ligands/surface chemical modifications. This book discusses why different classes of nanomaterials display toxic properties, and what can be done to mitigate this toxicity. It also explores how nanomaterials are being used as antimicrobial agents, being used to purify air and water, and counteract a range of infectious diseases. This is an important reference for materials scientists, environmental scientists and biomedical scientists, who are seeking to gain a greater understanding of how nanomaterials can be used to combat toxic agents, and how the toxicity of nanomaterials themselves can best be mitigated. - Explains the underlying phenomena and fundamental mechanisms through which nanomaterials interact with organisms and physiological media - Outlines major methods for mitigating and prevention of nanotoxicity - Discusses the applications of nanomaterials-based antibiotics
Download or read book Wear resistant Polyurethane Coatings written by D. Sh Korotkina and published by . This book was released on 1976 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Engineering Materials and Mechanics II written by Jong Wan Hu and published by Trans Tech Publications Ltd. This book was released on 2018-07-26 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 3rd International Conference on Applied Engineering, Materials and Mechanics (3rd ICAEMM) Selected, peer reviewed papers from the 3rd International Conference on Applied Engineering, Materials and Mechanics (3rd ICAEMM 2018), April 20-22, 2018, Okinawa Island, Japan
Download or read book Plasma polymerized Coatings on Various Substrates written by and published by . This book was released on 1987 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma Polymer Coatings to Prevent Pipeline Corrosion and Reduce Friction written by George W. Walpert and published by . This book was released on 1986 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three different materials, thiophene, hexamethyldisiloxane, and hexamethyldisilazane were deposited on mild steel coupons by low temperature radio-frequency plasma polymerization. Statistically designed experiment matrices were utilized to screen a range of operating conditions and optimize coating properties. For two of the materials, a narrower range of conditions was used to produce coating weights of about 400 micrograms per square centimeters, and these coatings were evaluated for corrosion protection and coating physical properties. Coatings were produced which yielded 256 hours in air-bubbled salt water to 95% corrosion. Uncoated coupons in the same test rusted to 95% in six hours. The best coating was deposited at a rate of 4 micrograms per square centimeter per minute, but reasonably good coatings were produced at coating rates of 20 to 30 micrograms per square centimeter per minute. The feasibility of corrosion protection coatings using low temperature plasma polymerization has been established by this project, but much process and product development remains for commercialization. Recommendations for continued development work are discussed in this report. Keywords: Ceramic materials; Pipelines; Diagnostic tests; real time; process control methods.
Download or read book LMP Plasma Polymerized Coatings on Copper Wire written by and published by . This book was released on 1982 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts Index written by and published by . This book was released on 1996 with total page 1622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1997 with total page 1850 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Maro Polymer Notes written by and published by . This book was released on 1998 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
