Microstructural Characterization Of Polymers By Positron Lifetime Spectroscopy PDF Download

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Microstructural Characterization of Semi-Interpenetrating Polymer Networks by Positron Lifetime Spectroscopy

Microstructural Characterization of Semi-Interpenetrating Polymer Networks by Positron Lifetime Spectroscopy
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
Total Pages: 38
Release: 2019
Genre: Science
ISBN: 9781792859113

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Thermoset and thermoplastic polyimides have complementary physical and mechanical properties. Whereas thermoset polyimides are brittle and generally easier to process, thermoplastic polyimides are tough but harder to process. A combination of these two types of polyimides may help produce polymers more suitable for aerospace applications. Semi-Interpenetrating Polymer Networks (S-IPN) of thermoset LaRC(TM)-RP46 and thermoplastic LaRC(TM)-IA polyimides were prepared in weight percent ratios ranging from 100:0 to 0:100. Positron lifetime measurements were made in these samples to correlate their free volume features with physical and mechanical properties. As expected, positronium atoms are not formed in these samples. The second lifetime component has been used to infer the positron trap dimensions. The 'free volume' goes through a minimum at a ratio of about 50:50, and this suggests that S-IPN samples are not merely solid solutions of the two polymers. These data and related structural properties of the S-IPN samples are discussed. Singh, Jag J. and Pater, Ruth H. and Eftekhari, Abe NASA-TP-3617, NAS 1.60:3617, L-17576 RTOP 505-63-50-01...


Characterization and Analysis of Polymers

Characterization and Analysis of Polymers
Author: Wiley
Publisher: John Wiley & Sons
Total Pages: 987
Release: 2008-02-08
Genre: Technology & Engineering
ISBN: 0470233001

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Based on Wiley's renowned Encyclopedia of Polymer Science and Technology, this book provides coverage of key methods of characterization of the physical and chemical properties of polymers, including atomic force microscopy, chromatographic methods, laser light scattering, nuclear magnetic resonance, and thermal analysis, among others. Written by prominent scholars from around the world, this reference presents over twenty-five self -contained articles on the most used analytical techniques currently practiced in polymer science.


NASA Technical Memorandum

NASA Technical Memorandum
Author:
Publisher:
Total Pages: 180
Release: 1997
Genre: Aeronautics
ISBN:

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Polymer Characterization

Polymer Characterization
Author: Dan Campbell
Publisher: CRC Press
Total Pages: 492
Release: 2017-12-21
Genre: Technology & Engineering
ISBN: 1482268361

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Discerning the properties of polymers and polymer-based materials requires a good understanding of characterization. This revised and updated text provides a comprehensive survey of characterization methods within its simple, concise chapters. Polymer Characterization: Physical Techniques, provides an overview of a wide variety of characterization methods, which makes it an excellent textbook and reference. It starts with a description of basic polymer science, providing a solid foundation from which to understand the key physical characterization techniques. The authors explain physical principles without heavy theory and give special emphasis to the application of the techniques to polymers, with plenty of illustrations. Topics covered include molecular weight determination, molecular and structural characterization by spectroscopic techniques, morphology and structural characterization by microscopy and diffraction, and thermal analysis. This edition contains a new chapter on surface analysis as well as some revised problems and solutions. The concise treatment of each topic offers even those with little prior knowledge of the subject an accessible source to relevant, simple descriptions in a well-organized format.


NASA Technical Paper

NASA Technical Paper
Author: United States. National Aeronautics and Space Administration
Publisher:
Total Pages: 492
Release: 1990
Genre: Aeronautics
ISBN:

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