Microgravity Polymers
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Microgravity Polymers
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Author :
language : en
Publisher:
Release Date : 1986
Microgravity Polymers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
Microgravity Studies Of Organic And Polymeric Materials
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Author : D. O. Frazier
language : en
Publisher:
Release Date : 1994
Microgravity Studies Of Organic And Polymeric Materials written by D. O. Frazier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Materials categories.
Polymer Research In Microgravity
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Author : James Patton Downey
language : en
Publisher:
Release Date : 2001
Polymer Research In Microgravity written by James Patton Downey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Science categories.
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.
Microgravity Studies Of Organic And Polymeric Materials
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Author : United States. National Aeronautics and Space Administration. Scientific and Technical Information Program
language : en
Publisher:
Release Date : 1994
Microgravity Studies Of Organic And Polymeric Materials written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Program and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Microgravity Polymers
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Author :
language : en
Publisher:
Release Date : 1986
Microgravity Polymers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Gravity categories.
Combustion Of A Polymer Pmma Sphere In Microgravity
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-05-29
Combustion Of A Polymer Pmma Sphere In Microgravity written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-29 with categories.
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.
Ion Beam Treatment Of Polymers
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Author : Alexey Kondyurin
language : en
Publisher: Newnes
Release Date : 2014-09-25
Ion Beam Treatment Of Polymers written by Alexey Kondyurin and has been published by Newnes this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-09-25 with Technology & Engineering categories.
Ion Beam Treatment of Polymers, Second Edition presents the results of polymer investigations and technique development in the field of polymer modification by high-energy ion beams. It shows how to use ion beam equipment in the polymer industry, as well as how to use it to produce new polymer materials. The authors, scientists and researchers active in the field, provide analysis and data from their work, and give an overview of related work by others. The authors focus on wetting, adhesion, hardness, chemical activity, environmental stability, biocompatibility, new synthesis methods, and space flight construction. The technologies of material modification by a beam of high energy ions have wide applications in different fields, from microelectronics to medicine. Historically, ion beam treatment of polymers had fewer applications due to high costs of ion beam equipment and low costs of polymer materials. The modern development of new pulse sources with a high current density and wide ion beams increase the effectiveness of ion beam technology for polymers. Collates data from many scientists working in polymer chemistry, physics of ion beam implantation, and in development and production of ion beam equipment Covers industrial and scientific applications of ion beam implanted polymers Integrates physical and chemical aspects of the processes in polymers treated by ion beams
Microgravity Processing And Photonic Applications Of Organic And Polymeric Materials
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Author :
language : en
Publisher:
Release Date : 1997
Microgravity Processing And Photonic Applications Of Organic And Polymeric Materials written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Combustion Of A Polymer Pmma Sphere In Microgravity Classic Reprint
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Author : Jiann C. Yang
language : en
Publisher: Forgotten Books
Release Date : 2018-03-17
Combustion Of A Polymer Pmma Sphere In Microgravity Classic Reprint written by Jiann C. Yang and has been published by Forgotten Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-03-17 with Technology & Engineering categories.
Excerpt from Combustion of a Polymer (Pmma) Sphere in Microgravity MA was not determined because the ejected material was never observed to exist beyond visible flame of the parent sphere. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Microgravity Processing And Photonic Applications Of Organic And Polymeric Materials
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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher: Independently Published
Release Date : 2018-10-29
Microgravity Processing And Photonic Applications Of Organic And Polymeric Materials written by National Aeronautics and Space Adm Nasa and has been published by Independently Published this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-29 with Science categories.
Some of the primary purposes of this work are to study important technologies, particularly involving thin films, relevant to organic and polymeric materials for improving applicability to optical circuitry and devices and to assess the contribution of convection on film quality in unit and microgravity environments. Among the most important materials processing techniques of interest in this work are solution-based and by physical vapor transport, both having proven gravitational and acceleration dependence. In particular, PolyDiAcetylenes (PDA's) and PhthaloCyanines (Pc's) are excellent NonLinear Optical (NLO) materials with the promise of significantly improved NLO properties through order and film quality enhancements possible through microgravity processing. Our approach is to focus research on integrated optical circuits and optoelectronic devices relevant to solution-based and vapor processes of interest in the Space Sciences Laboratory at the Marshall Space Flight Center (MSFC). Modification of organic materials is an important aspect of achieving more highly ordered structures in conjunction with microgravity processing. Parallel activities include characterization of materials for particular NLO properties and determination of appropriation device designs consistent with selected applications. One result of this work is the determination, theoretically, that buoyancy-driven convection occurs at low pressures in an ideal gas in a thermalgradient from source to sink. Subsequent experiment supports the theory. We have also determined theoretically that buoyancy-driven convection occurs during photodeposition of PDA, an MSFC-patented process for fabricating complex circuits, which is also supported by experiment. Finally, the discovery of intrinsic optical bistability in metal-free Pc films enables the possibility of the development of logic gate technology on the basis of these materials. Frazier, Donald O. and Paley, Mark S. and Penn, Benjamin G. and Abdelda...