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|Statement||David L. Edwards ... [et al.].|
|Series||NASA-TM -- 112522., NASA technical memorandum -- 112522.|
|Contributions||Edwards, David L., United States. National Aeronautics and Space Administration.|
|The Physical Object|
Download Space environmental effects on the optical properties of selected transparent polymers
Conversion efficiency is directly related to the polymer transmission. Space environmental effects will decrease the transmission and thus reduce the conversion efficiency.
This investigation. Get this from a library. Space environmental effects on the optical properties of selected transparent polymers. [David L Edwards; United States. National Aeronautics and Space. Conversion efficiency is directly related to the polymer transmission.
Space environmental effects will decrease the transmission and thus reduce the conversion efficiency. This investigation focuses on the effects of ultraviolet and charged particle radiation on the transmission of selected transparent polymers. Exposure of polymers and composites to the space environment may result in different detrimental effects via modification of their chemical, electrical, thermal, optical and mechanical properties.
Polymers are extensively used as construction materials in space systems due to their high strength-to-weight ratio Space environmental effects on the optical properties of selected transparent polymers book a variety of mechanical, thermal, electrical and thermo-optical properties. Typical polymers are polysiloxanes (silicones), epoxies, polyurethanes, polyesters, acetals, acrylics, polyamides, fluorocarbons, polyimides, by: observed in the space environment.
The aspects of the space environment section of this document discusses each aspect of the space environment and what ground simulation methods translate best to actual flight results. However, the synergism of all the elements of the space environment is difficult to duplicate on the ground.
In the s, when glass-optical fibres (GOFs) were developed, the idea of using transparent polymers for the same purposes was born [VOG02]. After substantial research and the development of efficient manufacturing processes, polymer-optical fibres (POFs) were ready to be sold commercially.
Nature of Impurities -Conjugated Polymers Prepared by Ferric Chloride and Their Effect on the Electrical Properties of Metal-Insulator-Semiconductor Structures.
Chemistry of Materials7 (4), DOI: /cma Space research demands very stringent requirements from these polymers because of the extreme environments experienced by these materials 1.
The polymers used outside the space system are the most affected ones. As we move from space exploration to space commercialization, these polymers have to last for 15–20 years of their designed life.
Optical properties. Polymers such as PMMA and HEMA:MMA are used as matrices in the gain medium of solid-state dye lasers, also known as solid-state dye-doped polymer lasers. These polymers have a high surface quality and are also highly transparent so that the laser properties are dominated by the laser dye used to dope.
ELECTRICAL AND OPTICAL PROPERTIES TABLE D.C. relative permittivity (dielectric constant) of selected polymers *r PE PP Polymethylpentene POM copolymer PMMA PVC PTFE EPDM Chlorosulphonated PE (CSM elastomer).
Polymers in Space. Materials Technology. This is an outdated version. Most serious problems are connected with changes of thermo optical properties, deterioration of mechanical properties, production of components of the intrinsic outer atmosphere of spacecraft that respond to contamination of its surface, and last but not least, mass.
Another major disadvantage of conventional polymer optical materials such as PMMA and PS is their poor thermal and environmental stability. This is a serious limitation because future use in optoelectronics will require better thermal properties.
There are several polymers that are transparent and stable at high temperatures. Polymers have now become widespread in their applications in optics, electro-optics, and photonics and this issue will serve to summarize the field and describe the latest research results.
Papers are sought which discuss the latest research in this area and/or review the state of the research in selected areas.
About this book This text addresses the common negative perception of polymer materials on the environment with a thorough analysis of what really occurs when industry and academia collaborate to find environmental solutions. *immediately available upon purchase as print book shipments may be delayed due to the COVID crisis.
ebook access is temporary and does not include ownership of the ebook. Only valid for books with an ebook version. anticipated thermal environment. While the optical glasses may exhibit upper service temperature limits of from to 8 C, many of the glass types having the most interesting optical properties are quite fragile, and prone to failure if cooled too quickly.
These failures are mostly attributable to cooling-induced shrinkage of the skin. Environmental Risk of Polymers and their Degradation Products Scott Lambert Submitted for the degree of Doctor of Philosophy University of York.
Polymer-dispersed liquid crystal (PDLC) films were prepared by the ultraviolet-light-induced polymerization of photopolymerizable monomers in nematic liquid crystal/chiral dopant/thiol-acrylate reaction monomer composites. The effects of the chiral dopant and crosslinking agents on the electro-optical properties of the PDLC films were systematically investigate.
Optical properties of polymers, such as, gloss, transparency, clarity, haze, colour, surface aspect and refractive index, are closely linked to our perception of a plastic product’s quality and visual performance.
Polymer optical properties testing will bring you insight to accelerate development and to optimise or troubleshoot production. well as optical properties such as shape, size, refractive index, birefringence, and extinction characteristics.
Physical properties such as melting point and solubility may also be measured. However, because of the newness of some of these fibers, there is a paucity of research on the effect of environmental degradation.
properties can also be further grouped into categories: mechanical, thermal, electrical, magnetic, optical etc. The chemical properties include: environmental and chemical stability. There are also some general properties which cannot be classified within these groups: • Density, ρ (Units: Mg/m 3, g/cm 3).
the ratios as low as possible to minimize deflection. Some selected plastic optical materials with structural properties are listed in Table 2. Table 2.
Structural properties and figures of merit for plastic optical materials N-BK7 82 Germanium Sapphire Mechanical)Properties)of) Polymers) Kamyar)Davoudi) October, Materials)Science)Seminar.
Four different polymers are analyzed by GPC/SEC to investigate the effect of molecular weight, dispersity and molecular structure on the final properties of the polymer. Introduction Polymer scientists are continually striving to manufacture products that have. List criteria used for specifying an optical coating for the space environment.
Define a test plan to assure coating performance over system life. Intended Audience This course is intended for optics professionals and others who are interested in the design and production of optical coatings for space applications.
Optical Properties of Metals Optical Properties of Nonmetals Applications of Optical Phenomena Environmental, and Societal Issues in Materials Science and Engineering Questions and Problems P Appendix A The International System of Units (SI) A Appendix B Properties of Selected Engineering Materials A Appendix C.
Previously, he was manager of the Chemical Research Area at Xerox Corporation. He is the editor of the book Nonlinear Optical Properties of Organic and Polymeric Materials and a member of the American Chemical Society and Optical Society of America.
Williams received his PhD in chemical physics from the University of Rochester in Three-dimensional networks can be hydrophilic and/or hygroscopic. Optical, mechanical, and electrical properties of these materials encompass many fields of technology.
Composites of carbon nanotubes (CNTs) in polymeric materials have attracted considerable attention in the research and industrial communities due to their unique optical, mechanical, and electrical properties.
How Easy is it to See Through the Optical Properties of Thermoplastics. Transparency in thermoplastics is a property that differentiates them from many other manufacturing materials.
This includes metals, ceramics and wood, and, in some cases surpasses glass. physical and optical properties, and associated phase-change temperatures. Preliminary evaluations of the effect of the space environment on the coatings and the degree of ther mal regulation attainable with these coatings were also made.
The results from the study. These excellent field-effect properties together with the excellent optical waveguide properties in CHICZ crystals (Fig. 1) indicate their potential application in our proposed integrated. exposure in the space environment.1,2 Teflon FEP (fluorinated ethylene propylene), a common thermal control material, has been observed to become brittle upon long-term space exposure on the Hubble Space Telescope (HST).2 Space environmental effects that can cause damage to polymers.
Coloration of infrared-transparent polyethylene textiles is demonstrated to address the major challenge toward wide adoption of radiative cooling technology for personal thermal management. Utilizing inorganic pigment nanoparticles, such as Prussian blue, iron oxide, and silicon, infrared-transparent polyethylene fabrics of various colors are developed via scalable fabrication processes.
The optical properties of a series of high refractive index polyphosphazenes were investigated. The wavelength-dependent change in refractive index (optical dispersion) associated with two selected polymers was examined using variable-angle spectroscopic ellipsometry.
Values of the Abbé number for these polymers were calculated. These systems have a νD = 20−25, which compares closely with. Get this from a library. Space environmental effects on polymeric materials: May 1, tofinal technical report.
[Richard L Kiefer; Robert A Orwoll; United States. National Aeronautics and Space Administration.]. Recent research and development of colorless and transparent high-temperature-resistant polymer optical films (CHTPFs) have been reviewed. CHTPF films possess the merits of both common polymer optical film and aromatic high-temperature-resistant polymer films and thus have been widely investigated as components for microelectronic and optoelectronic fabrications.
The book examines the environmental and social effects of polymer materials and explains methods of quantifying environmental performance. With an emphasis on the importance of education, the authors stress the importance of awareness and activity in negating polymers' environmental.
Issued as an Addendum to the Space Materials Handbook. This bibliography contains selected references on seals, gaskets, adhesives, sealants, and other elastomeric and polymeric materials under space conditions.
Environmental conditions that will effect materials in space are exposure to high vacuum, service temperatures, and radiation. In the following the solar optical properties and the infrared radiative properties will be described and discussed separately. Due to restrictions in space only selected data sets are presented, which, however, are representative of the various molecular and microstructural effects observed.
Solar Optical Properties. Effect of surface charging on the erosion rate of polyimide under 5 eV atomic oxygen beam exposure; M. Tagawa et al. Influence of space environment on spectral optical properties of thermal control coatings; V.M.
Prosvirikov, et al. Mitigation of thruster plume-induced erosion of ISS sensitive hardware; C. Pankop, J. Alred, P. Boeder.Since the discovery of the light emitting properties of the phenyl-based organic semiconductors in there has been a huge growth of interest in conjugated polymers.
The potential device applications are enormous, ranging from optical switching to solar cells and light emitting devices. They are also active components in many important biological ss in our understanding of.
“If you give me the initial material properties and measure the incoming light intensity, we know exactly how much light will go through with deformation.” He adds that going forward, he hopes to use the equation to help tune the transparency and optical transmittance of materials with more complex surfaces and textures.