Download or read book Electron Beam E Beam Processing as a Means of Achieving High Performance Composite Structures written by James M. Sands and published by . This book was released on 2001-11-01 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron-beam (E-beam) curing is among the key out-of-autoclave technologies being explored for future advanced composite and adhesive applications. E-beam irradiation curing is capable of rapid and through- thickness curing of composite samples up to 2-in thickness, eliminating the need for long cure cycles in the autoclave. However, current resin and adhesive chemistries are optimized for cure by thermal initiation, which involves slow ramps and long cure cycles, particularly for thermoset composites based on epoxides. Therefore, in order to provide improved performance in composite systems cured by E-beam irradiation, a program was undertaken to investigate performance and formulation effects in two E-beam curable systems. One system, a free-radical-cured acrylic system, introduces the concept of interpenetrating network structures as a means of meeting performance requirements in E-beam- processed composites. The second resin system incorporates cationic curing of epoxides induced through Lewis acid or cation generating initiators. Additionally, a new approach to toughened interpenetrating polymer networks (IPNs) based on simultaneous cure using both free-radical and cationic-cure mechanisms is proposed along with initial experimental characterizations. The results of formulation and processing modifications on key properties of adhesives, resins, and composites structures are demonstrated.
Download or read book Electron Beam E Beam Processing as a Means of Achieving High Performance Composite Structures written by and published by . This book was released on 2001 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron-beam (E-beam) curing is among the key out-of-autoclave technologies being explored for future advanced composite and adhesive applications. E-beam irradiation curing is capable of rapid and through-thickness curing of composite samples up to 2-in thickness, eliminating the need for long cure cycles in the autoclave. However, current resin and adhesive chemistries are optimized for cure by thermal initiation, which involves slow ramps and long cure cycles, particularly for thermoset composites based on epoxides. Therefore, in order to provide improved performance in composite systems cured by E-beam irradiation, a program was undertaken to investigate performance and formulation effects in two E-beam curable systems. One system, a free-radical-cured acrylic system, introduces the concept of interpenetrating network structures as a means of meeting performance requirements in E-beam-processed composites. The second resin system incorporates cationic curing of epoxides induced through Lewis acid or cation generating initiators. Additionally, a new approach to toughened interpenetrating polymer networks (IPNs) based on simultaneous cure using both free-radical and cationic-cure mechanisms is proposed along with initial experimental characterizations. The results of formulation and processing modifications on key properties of adhesives, resins, and composites structures are demonstrated.
Download or read book Radiation Processing of Polymer Materials and Its Industrial Applications written by Keizo Makuuchi and published by John Wiley & Sons. This book was released on 2012-02-07 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text examines the effect of radiation on polymers and the versatility of its industrial applications. By helping readers understand and solve problems associated with radiation processing of polymers, it serves as an important reference and fills a gap in the literature. Radiation processing can significantly improve important properties of polymers, however, there are still misconceptions about processing polymers by using ionizing radiation. This book explains the radiation processing of polymeric materials used in many industrial products including cars, airplanes, computers, and TVs. It even addresses emerging "green" issues like biomaterials and hydrogels.
Download or read book High Performance Structural Fibers for Advanced Polymer Matrix Composites written by National Research Council and published by National Academies Press. This book was released on 2005-06-09 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Military use of advanced polymer matrix composites (PMC)â€"consisting of a resin matrix reinforced by high-performance carbon or organic fibersâ€"while extensive, accounts for less that 10 percent of the domestic market. Nevertheless, advanced composites are expected to play an even greater role in future military systems, and DOD will continue to require access to reliable sources of affordable, high-performance fibers including commercial materials and manufacturing processes. As a result of these forecasts, DOD requested the NRC to assess the challenges and opportunities associated with advanced PMCs with emphasis on high-performance fibers. This report provides an assessment of fiber technology and industries, a discussion of R&D opportunities for DOD, and recommendations about accelerating technology transition, reducing costs, and improving understanding of design methodology and promising technologies.
Download or read book Applications of High Energy Radiations written by Subhendu Ray Chowdhury and published by Springer Nature. This book was released on 2023-05-14 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the applications of high-energy beam radiation for synthesis and processing of polymeric materials. It addresses fundamental nature of high energy i.e., ionizing radiations and interaction with monomers and polymers leading to a wide variety of products such as tyres, textiles, shape memory polymers, polymers for aviation and space applications, polymeric biomaterials and natural rubber latex. It discusses general principles and techniques of preparation of polymeric materials including polymer blends, composites and nanocomposites. It also includes the topic of radiation-assisted recycling of polymers through breaking of covalent bonds. This book will be useful for students, researchers and professionals in the areas of polymers science and technology, radiation technology, electron beam technology, gamma radiation technology, advanced materials technology, biomaterials technology, nanotechnology, membrane science technology and environmental science.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SAMPE Symposium and Exhibition written by Benjamin M. Rasmussen and published by . This book was released on 2002 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SAMPE Symposium and Exhibition written by Linas Repecka and published by Taylor & Francis. This book was released on 2001 with total page 2637 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book UV Coatings written by Reinhold Schwalm and published by Elsevier. This book was released on 2006-12-21 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since UV curing (light induced polymerisation of multifunctional oligomers) is a very ecoefficient and energy saving curing method, the growth rates of UV curable coatings are in the range of 10% per year. The typical UV coatings are solvent free (100% solids), thus helping the industry and the environment to reduce significantly VOC (volatile organic compounds). Recently, the automotive industry has discovered that UV cured coatings are very scratch resistant, which stimulated very extensive work into the development of UV coatings for automotive applications. Since UV curing is very universal, also other systems besides the 100% solid (typical) UV coatings are developed, like waterbased UV- , UV powder and Dual cure (UV and thermal) systems.UV Coatings contains an overview of the technology, the curing process including the equipment necessary, the raw materials (resins, diluents, photoinitiators) used, the advantages and drawbacks of this fast emerging technology, as well as proposed technical solutions to tackle the disadvantages. Structure-property relationships will be given, especially regarding the mechanical properties of coatings as well as scratch resistance, mainly dealing with automotive performance criteria. The main part of the book will deal with new developments, like water-based UV coatings, UV powder coatings and dual cure systems, cured by UV and thermal energy, which have been developed to cure the coating on three dimensional substrates in shadow areas. The main applications of UV Coatings will be described, starting with the classical ones on temperature sensitive substrates, like wood, paper and plastics, where the UV curable coatings are already well established.* Looking at UV curing as a key to scratch resistant automotive clear coats* Ecoefficiency of UV Coatings* Comprehensive overview of the technology, materials and markets
Download or read book FY US Air Force Plan for Defense Research Sciences written by and published by . This book was released on 1985 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Energy Particle Accelerator Based Technologies and Their Applications written by Vlado Valković and published by CRC Press. This book was released on 2022-06-22 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low Energy Particle Accelerator-Based Technologies and Their Applications describes types of low energy accelerators, presents some of the main manufacturers, illustrates some of the accelerator laboratories around the globe and shows examples of successful transfers of accelerators to needed laboratories. Key Features: Presents new trends and the state of the art in a field that's growing Provides an overview of numerous applications of such accelerators in medicine, industry, earth sciences, nuclear non-proliferation and oil Fills a gap, with the author drawing on his own experiences with transporting such relatively large machines from one lab to the other that require a tremendous amount of planning, technical and engineering efforts This is an essential reference for advanced students as well as for physicists, engineers and practitioners in accelerator science. About the Author Dr. Vladivoj (Vlado) Valković, a retired professor of physics, is a fellow of the American Physical Society and Institute of Physics (London). He has authored 22 books (from Trace Elements, Taylor & Francis, 1975, to Radioactivity in the Environment, Elsevier, 1st Edition 2001, 2nd Edition 2019), and more than 400 scientific and technical papers in the research areas of nuclear physics, applications of nuclear techniques to trace element analysis in biology, medicine and environmental research. He has lifelong experience in the study of nuclear reactions induced by 14 MeV neutrons. This research has been done through coordination and works on many national and international projects, including US-Croatia bilateral, NATO, IAEA, EU-FP5, FP6 and FP7 projects. Cover photo credit: 3SDH 1 MV Pelletron system with RF source and analysis endstation designed with the intended purpose of aiding in fusion research. It is capable of Ion Beam Analysis (IBA) techniques such as RBS, ERD, PIXE and NRA. Further detectors could be added to the endstation to allow for other techniques. Installed in Japan in 2014. Courtesy of National Electrostatics Corp.
Download or read book NTIS Alert written by and published by . This book was released on 2002 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Processing and Application of Micro and Nanostructured Materials written by Bogdan Stefan Vasile and published by MDPI. This book was released on 2020-12-14 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is focused on nanostructured materials, which have been well-studied in various fields from life to materials sciences. Nanostructured science has the potential to help make revolutionary discoveries based on modifying the properties of these materials compared with micro-structured materials. Nanostructured materials are the key to discovering new products based on new technologies. This book is focused on presenting new state-of-the-art methods for the synthesis and processing of nanostructured materials. These materials can be used in both in life and materials science with applications from biomedical devices, drug delivery systems, medical imaging with multiferoic materials, high-energy batteries, capacitors, superconductors, and aerospace components.
Download or read book Composites Industry Abstracts written by and published by . This book was released on 1996 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Awards in Engineering written by and published by . This book was released on 1983 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1990 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Materials for Next Generation Commercial Transports written by Committee on New Materials for Advanced Civil Aircraft and published by National Academies Press. This book was released on 1996-03-29 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major objective of this book was to identify issues related to the introduction of new materials and the effects that advanced materials will have on the durability and technical risk of future civil aircraft throughout their service life. The committee investigated the new materials and structural concepts that are likely to be incorporated into next generation commercial aircraft and the factors influencing application decisions. Based on these predictions, the committee attempted to identify the design, characterization, monitoring, and maintenance issues that are critical for the introduction of advanced materials and structural concepts into future aircraft.
