Study Of Transport Preperties And Structure Of Extended Chain Polymers
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Study Of Transport Properties And Structure Of Extended Chain Polymers
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Author : R. Edward Barker (Jr)
language : en
Publisher:
Release Date : 1985
Study Of Transport Properties And Structure Of Extended Chain Polymers written by R. Edward Barker (Jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
The broad objective of the work was to relate charge, heat, and mass transport in the Air Force's extended chain polymers (especially poly-para-phenylene benzobisthiazole PBT) to other electrical, thermal, mechanical nad microstructural properties of the polymers and also to compare these very unusual, highly anisotropic Air Force materials with other materials when it is scientifically relevant or when potential applications may be involved. Special techniques were developed for making transport-property determinations on samples in the form of thin fibers and small area films. Two types of miniature cells were developed in the study of PBT transport properties. A very promising area of the research relates to an anisotropic version of the Barker-Sharbaugh weak electrolyte model for ionic conduction in polymers. A new technique which has been termed the diffusion controlled-differential current (DCDC) method evolved from experiments related to the weak electrolyte model. This DCDC-technique looks promising as a new analytical tool. The results for PBT turned out to be especially interesting because the ratio of ionic conductivities parallel and perpendicular to the chain axis was very large (100,000 at 300 K) and temperature dependent (smaller ratio at a higher temperature). Special techniques for the thermal conductivity allowed the axial and perpendicular thermal conductivities to be determined.
Study Of Transport Properties And Structure Of Extended Chain Polymers Diffusion And Solubility Of Gases
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Author : R. Edward Barker (Jr)
language : en
Publisher:
Release Date : 1985
Study Of Transport Properties And Structure Of Extended Chain Polymers Diffusion And Solubility Of Gases written by R. Edward Barker (Jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
The study of the transport properties in extended chain polymers has added to the understanding of relations between their macroscopic and microscopic properties. There was a need to determine the extent to which a new class of high strength extended chain polymers absorb various vapors and how the vapor moves within the materials, which have a highly anisotropic fibrous morphology. The main polymer studied as a representative of the class is poly p-phenylene benzobisthiazole (PPBT). An abnormally large heat of sorption (solution) and paradoxical data from two experimental systems with somewhat different conditions are attributed to a large volume fraction of microcavities in PPBT. This hypothesis was shown to be consistent by using the theory of dual sorption. A statistical mechanical model due to diBenedetto was modified to correlate the activation energy with rotation energy and to make possible the prediction of the parallel diffusion coefficient.
Study Of Transport Properties And Structure Of Extended Chian Polymers
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Author : R. Edward Barker
language : en
Publisher:
Release Date : 1985
Study Of Transport Properties And Structure Of Extended Chian Polymers written by R. Edward Barker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
Study Of Transport Preperties And Structure Of Extended Chain Polymers
DOWNLOAD
Author : R. Edward Barker
language : en
Publisher:
Release Date : 1985
Study Of Transport Preperties And Structure Of Extended Chain Polymers written by R. Edward Barker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
Structure And Transport Properties In Organized Polymeric Materials
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Author : Emo Chiellini
language : en
Publisher: World Scientific
Release Date : 1997
Structure And Transport Properties In Organized Polymeric Materials written by Emo Chiellini and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Technology & Engineering categories.
This multi-authored book includes selected contributions reviewing the results achieved in the synthesis and characterization of organized polymeric materials. The focus is on competitive materials with liquid crystalline or electroconductive properties. The fine tuning of the properties offered by advanced chemical synthesis has been investigated by a large number of state-of-the-art techniques, including both microscopic (ESR, NMR, dielectrometry, fluorescence, IR, Raman spectroscopy) and macroscopic (calorimetric, mechanical) methodologies. The book also provides an updated coverage of the most challenging applications of organized polymers as functional materials in the fields of electrooptical devices, information retrieval and organic electroconductors.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1992
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Aeronautics categories.
Afosr Chemical Atmospheric Sciences Program Review
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Author : United States. Air Force. Directorate of Chemical and Atmospheric Sciences
language : en
Publisher:
Release Date :
Afosr Chemical Atmospheric Sciences Program Review written by United States. Air Force. Directorate of Chemical and Atmospheric Sciences and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Atmospheric chemistry categories.
Transport Properties In Polymers
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Author : Jiri Stastna
language : en
Publisher: CRC Press
Release Date : 1995-03-01
Transport Properties In Polymers written by Jiri Stastna and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-03-01 with Technology & Engineering categories.
From the Authors Introduction Diffusion is one of the few manageable nonequilibrium pro- cesses during which matter is transported through a system. Traditionally, diffusion is studied in physical chemistry; however, the fundamental understanding of diffusion processes is not possible without involving statistical physics. Diffusion in disordered systems, such as in polymers, has sometimes unexpected features, the nature of which has not yet been determined. Since modern technology involves more and more complex materials which rely on a subtle balance of microscopic effects, the understanding of diffusion processes in these materials is of paramount importance from the practical point of view. A renewed interest in the basic principles of diffusion is a direct result of new experimental data. This was a contributing factor in the preparation of this text. In the first chapter, the phenomenological thermodynamic basics of diffusion is reviewed, and the diffusion equation is derived from the principles of irreversible thermodynamics. The basic mathematical apparatus for solving diffusion equations is reviewed in the second chapter. The third chapter deals mainly with the vast amount of experimental data dealing with diffusion in polymers. . . . A reader interested in particular polymeric systems can use the . . . material as a useful introduction. The last chapter contains basic information concerning random walks and their application to the diffusion in disordered systems. The theory of random walks is widely used in polymer physics where it is usually combined with statistical mechanics to formulate various models of polymeric systems. Finally, useful mathematical formulas and references to the original sources of some mathematical methods are [provided] in the appendices. Some physical constants associated with several polymer solvent systems are also presented.
Physical Techniques For The Study Of Sorption Electrical Properties And Interfacial Effects In Ordered Polymers
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Author : R. Edward Barker
language : en
Publisher:
Release Date : 1986
Physical Techniques For The Study Of Sorption Electrical Properties And Interfacial Effects In Ordered Polymers written by R. Edward Barker 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.
Recent Research Accomplishments Of The Air Force Office Of Scientific Research
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Author : United States. Air Force. Office of Scientific Research
language : en
Publisher:
Release Date : 1989
Recent Research Accomplishments Of The Air Force Office Of Scientific Research written by United States. Air Force. Office of Scientific Research and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Aeronautics categories.