Download or read book Microgravity Polymers written by and published by . This book was released on 1986 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Research in Microgravity written by James Patton Downey and published by . This book was released on 2001 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sixteen papers examine how gravity can affect polymerizations and polymer processing and how weightlessness or "microgravity" is achieved. The volume reviews the current research from sounding rocket and orbital investigations, parabolic flight investigations, and ground-based research. Also covered are inorganic to biologically produced polymers, including free-radical polymerization, polymer-dispersed luquid crystals and foams.
Download or read book Microgravity Polymers written by and published by . This book was released on 1986 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microgravity Studies of Organic and Polymeric Materials written by D. O. Frazier and published by . This book was released on 1994 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymers in Space Research written by Charles L. Segal and published by . This book was released on 1970 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microgravity Polymers written by Lewis Research Center and published by . This book was released on 1986 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymers and Other Advanced Materials written by Ting Joo Fai and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the Third International Conference on Frontiers of Polymers and Advanced Materials held in Kuala Lumpur, Malaysia, January 16-20, 1995
Download or read book Polymers in Space Research written by Symposium on Polymers in Space Research Staff and published by . This book was released on with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymers in Space Research written by Charles L. Segal and published by Marcel Dekker. This book was released on 1970 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microgravity Research and Processing written by American Chemical Society. Division of Polymer Chemistry and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Combustion of a Polymer Pmma Sphere in Microgravity written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-19 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of low gravity, aircraft-based, experiments was conducted to investigate the combustion of supported thermoplastic polymer spheres under varying ambient conditions. The three types of thermoplastic investigated were polymethylmethacrylate (PMMA), polypropylene (PP). and polystyrene (PS). Spheres with diameters ranging from 2 mm to 6.35 mm were tested. The total initial pressure varied from 0.05 MPa to 0. 15 MPa whereas the ambient oxygen concentration varied from 19 % to 30 % (by volume). The ignition system consisted of a pair of retractable energized coils. Two CCD cameras recorded the burning histories of the spheres. The video sequences revealed a number of dynamic events including bubbling and sputtering, as well as soot shell formation and break-up during combustion of the spheres at reduced gravity. The ejection of combusting material from the burning spheres represents a fire hazard that must be considered at reduced gravity. The ejection process was found to be sensitive to polymer type. All average burning rates were measured to increase with initial sphere diameter and oxygen concentration, whereas the initial pressure had little effect. The three thermoplastic types exhibited different burning characteristics. For the same initial conditions, the burning rate of PP was slower than PMMA, whereas the burning rate of PS was comparable to PMMA. The transient diameter of the burning thermoplastic exhibited two distinct periods: an initial period (enduring approximately half of the total burn duration) when the diameter remained approximately constant, and a final period when the square of the diameter linearly decreased with time. A simple homogeneous two-phase model was developed to understand the changing diameter of the burning sphere. Its value is based on a competition between diameter reduction due to mass loss from burning and sputtering, and diameter expansion due to the processes of swelling (density decrease with heating) and bubble growth.
Download or read book Future Materials Science Research on the International Space Station written by National Research Council and published by National Academies Press. This book was released on 1997-11-27 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microgravity Effects on Combustion of Polymers written by David B. Hirsch and published by . This book was released on 2000 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: NASA Glenn Research Center conducted a cooperative program with the Russian Space Agency Keldysh Research Center, with technical support provided by NASA Johnson Space Center White Sands Test Facility, to investigate polymer combustion in ventilated microgravity in a small combustion tunnel operated on the orbital station Mir. Reported here are ground test results on flammability characteristics of the test materials for verification of the data and conclusions of the space measurements. It was found that very low forced convective flows can sustain polymer combustion in microgravity. Shutoff of the flow, however, is likely to suppress the combustion, particularly if the fire is in the incipient phase and the oxygen concentration is sufficiently low. Relative flammability rankings obtained in ground tests focusing on limiting oxygen index and cone calorimeter heat-release tests would not apply to microgravity environments if the ranking criterion is the minimum forced-flow velocity required for sustained combustion. Convective flows caused by buoyancy in the ground NASA STD 6001 Test 1 far exceeded the minimum forced convective flows required to sustain microgravity combustion. Results indicate that this test provided conservative results for the materials tested in microgravity by sustaining their combustion in less severe oxygen concentration and total pressure conditions than those in which extinguishment occurred in quiescent microgravity environments.
Download or read book Design and Fabrication of Large Polymer Constructions in Space written by Alexey Kondyurin and published by Elsevier. This book was released on 2022-09-29 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design and Fabrication of Large Polymer Constructions in Space is a ground-breaking study of the polymeric materials, advanced chemical processes, and cutting-edge technology required in the construction of large polymer-based structures for space, when all steps in the process are carried out in the space environment, whether in orbit, in deep space, or on the surface of a moon, asteroid, or planet.The book begins by introducing the fundamentals and requirements of large constructions and inflatable structures for space. The next section of the book focuses on the utilization of polymeric materials within the space environment, examining the effects on materials (vacuum, plasma, temperature), the possible approaches to polymerization both in space and in orbit, the preparation and structure of polymer composites, and the methods for testing materials and structures in terms of strength, defects, and aging. Three chapters then cover how these materials and techniques might be applied to specific categories of construction, including larger space habitats, supporting space structures, and ground infrastructure. Finally, the financial aspects, the consequences for human space exploitation, and the possible future developments are discussed.Using materials science to push the boundaries of construction for space exploration and exploitation, this book is a unique resource for academic researchers and advanced students across polymer science, advanced materials, chemical engineering, construction, and space engineering, as well as for researchers, scientists and engineers at space agencies, companies and laboratories, involved in developing materials or technology for use in space. This is also of great interest to anyone interested in the role of materials science in the building of large space stations, spacecraft, planetary bases, large aperture antenna, radiation and thermal shields, and repairmen sets. Describes the role of polymers in the construction of large space habitats, supporting space structures, and ground infrastructure Explains polymerization in the Earth’s orbit and in space, covering material specifications, control of curing, and the effects of interaction with the external environment Presents the possible testing methods, including strength evaluation, defect detection, and aging tests of materials and constructions
Download or read book Crystallization of Polyethylene Under Low Gravity Conditions written by Benjamin E. Goldberg and published by . This book was released on 1992 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Combustion of a Polymer PMMA Sphere in Microgravity written by Jiann C. Yang and published by . This book was released on 1999 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The video sequences revealed a number of dynamic events including bubbling and sputtering as well as soot shell formation and break-up during combustion of the spheres at reduced gravity. The ejection of combusting material from the burning spheres represents a fire hazard that must be considered at reduced gravity. The ejection was found to be sensitive to polymer type, but independent of oxygen concentration and pressure. The average value of the ejection frequency was found to be 3 Hz, 5 Hz, and 5 Hz for PMMA, PS, and PP, respectively. The velocities of the ejected material were estimated by tracking the material in two consecutive video frames. For the PP spheres, Va=2.3 (+/-1.2) cm/s (with 60 events observed). The ejected material appeared to decelerate at an average rate of ~40 cm/s2, and traverse an average distance of only 8 mm before burning to completion.
Download or read book Microgravity Manufacturing Via Fused Deposition written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manufacturing polymer hardware during space flight is currently outside the state of the art. A process called fused deposition modeling (FDM) can make this approach a reality by producing net-shaped components of polymer materials directly from a CAE model. FDM is a rapid prototyping process developed by Stratasys, Inc.. which deposits a fine line of semi-molten polymer onto a substrate while moving via computer control to form the cross-sectional shape of the part it is building. The build platen is then lowered and the process is repeated, building a component directly layer by layer. This method enables direct net-shaped production of polymer components directly from a computer file. The layered manufacturing process allows for the manufacture of complex shapes and internal cavities otherwise impossible to machine. This task demonstrated the benefits of the FDM technique to quickly and inexpensively produce replacement components or repair broken hardware in a Space Shuttle or Space Station environment. The intent of the task was to develop and fabricate an FDM system that was lightweight, compact, and required minimum power consumption to fabricate ABS plastic hardware in microgravity. The final product of the shortened task turned out to be a ground-based breadboard device, demonstrating miniaturization capability of the system. Cooper, K. G. and Griffin, M. R. Marshall Space Flight Center NASA/TM-2003-212636, NAS 1.15:212636, M-1083
