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Influence Of Molecular Weight On The Mechanical Performance Of A Thermoplastic Glassy Polyimide
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Book Synopsis Influence of Molecular Weight on the Mechanical Performance of a Thermoplastic Glassy Polyimide by : Lee M. Nicholson
Download or read book Influence of Molecular Weight on the Mechanical Performance of a Thermoplastic Glassy Polyimide written by Lee M. Nicholson and published by . This book was released on 1999 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720581222 Total Pages :34 pages Book Rating :4.5/5 (812 download)
Book Synopsis Influence of Molecular Weight on the Mechanical Performance of a Thermoplastic Glassy Polyimide by : National Aeronautics and Space Administration (NASA)
Download or read book Influence of Molecular Weight on the Mechanical Performance of a Thermoplastic Glassy Polyimide written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical Testing of an advanced thermoplastic polyimide (LaRC-TM-SI) with known variations in molecular weight was performed over a range of temperatures below the glass transition temperature. The physical characterization, elastic properties and notched tensile strength were all determined as a function of molecular weight and test temperature. It was shown that notched tensile strength is a strong function of both temperature and molecular weight, whereas stiffness is only a strong function of temperature. A critical molecular weight (Mc) was observed to occur at a weight-average molecular weight (Mw) of approx. 22000 g/mol below which, the notched tensile strength decreases rapidly. This critical molecular weight transition is temperature-independent. Furthermore, inelastic analysis showed that low molecular weight materials tended to fail in a brittle manner, whereas high molecular weight materials exhibited ductile failure. The microstructural images supported these findings.Nicholson, Lee M. and Whitley, Karen S. and Gates, Thomas S. and Hinkley, Jeffrey A.Langley Research CenterMOLECULAR WEIGHT; MECHANICAL PROPERTIES; POLYIMIDES; ELASTIC PROPERTIES; THERMOPLASTICITY; TENSILE STRENGTH; DUCTILE-BRITTLE TRANSITION; TEMPERATURE DEPENDENCE; FRACTOGRAPHY; GLASS TRANSITION TEMPERATURE; STRESS-STRAIN DIAGRAMS; MODULUS OF ELASTICITY; MICROSTRUCTURE; POLYMER MATRIX COMPOSITES; NOTCHES; TENSILE TESTS
Book Synopsis Influence of Molecular Weight on the Mechanical Performance of a Thermoplastic Glassy Polyimide by : Lee M. Nicholson
Download or read book Influence of Molecular Weight on the Mechanical Performance of a Thermoplastic Glassy Polyimide written by Lee M. Nicholson and published by . This book was released on 1999 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Combined Influence of Molecular Weight and Temperature on the Aging and Viscoelastic Response of a Glassy Thermoplastic Polyimide by : Lee M. Nicholson
Download or read book The Combined Influence of Molecular Weight and Temperature on the Aging and Viscoelastic Response of a Glassy Thermoplastic Polyimide written by Lee M. Nicholson and published by . This book was released on 2000 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of molecular weight on the viscoelastic performance of an advanced polymer (LaRC-SI) was investigated through the use of creep compliance tests. Testing consisted of short-term isothermal creep and recovery with the creep segments performed under constant load. The tests were conducted at three temperatures below the glass transition temperature of five materials of different molecular weight. Through the use of time-aging-time superposition procedures, the material constants, material master curves and aging-related parameters were evaluated at each temperature for a given molecular weight. The time-temperature superposition technique helped to describe the effect of temperature on the timescale of the viscoelastic response of each molecular weight. It was shown that the low molecular weight materials have higher creep compliance and creep rate, and are more sensitive to temperature than the high molecular weight materials. Furthermore, a critical molecular weight transition was observed to occur at a weight-average molecular weight of ~2500 g/mol below which, the temperature sensitivity of the time-temperature superposition shift factor increases rapidly. The short-term creep compliance data were used in association with Struik's effective time theory to predict the long-term creep compliance behavior for the different molecular weights. At long timescales, physical aging serves to significantly decrease the creep compliance and creep rate of all the materials tested.
Book Synopsis The Role of Molecular Weight and Temperature on the Elastic and Viscoelastic Properties of a Glassy Thermoplastic Polyimide by : Lee M. Nicholson
Download or read book The Role of Molecular Weight and Temperature on the Elastic and Viscoelastic Properties of a Glassy Thermoplastic Polyimide written by Lee M. Nicholson and published by . This book was released on 2001 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical testing of the elastic and viscoelastic response of an advanced thermoplastic polyimide (LaRC-SI) with known variations in molecular weight was performed over a range of temperatures below the glass transition temperature. The notched tensile strenght was shown to be a strong function of both molecular weight and temperature, whereas stiffness was only a strong function of temperature. A critical molecular weight was observed to occur at a weight-average molecular weight of ~22,000 g/mol below which, the notched tensile strength decreases rapidly. This critical molecular weight transition is temperature-independent. Low molecular weight materials tended to fail in a brittle manner, whereas high molecular weight materials exhibited ductile failure.
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781723766961 Total Pages :34 pages Book Rating :4.7/5 (669 download)
Book Synopsis The Combined Influence of Molecular Weight and Temperature on the Aging and Viscoelastic Response of a Glassy Thermoplastic Polyimide by : National Aeronautics and Space Adm Nasa
Download or read book The Combined Influence of Molecular Weight and Temperature on the Aging and Viscoelastic Response of a Glassy Thermoplastic Polyimide written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-17 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of molecular weight on the viscoelastic performance of an advanced polymer (LaRC-SI) was investigated through the use of creep compliance tests. Testing consisted of short-term isothermal creep and recovery with the creep segments performed under constant load. The tests were conducted at three temperatures below the glass transition temperature of five materials of different molecular weight. Through the use of time-aging-time superposition procedures, the material constants, material master curves and aging-related parameters were evaluated at each temperature for a given molecular weight. The time-temperature superposition technique helped to describe the effect of temperature on the timescale of the viscoelastic response of each molecular weight. It was shown that the low molecular weight materials have higher creep compliance and creep rate, and are more sensitive to temperature than the high molecular weight materials. Furthermore, a critical molecular weight transition was observed to occur at a weight-average molecular weight of M (bar) (sub w) 25000 g/mol below which, the temperature sensitivity of the time-temperature superposition shift factor increases rapidly. The short-term creep compliance data were used in association with Struik's effective time theory to predict the long-term creep compliance behavior for the different molecular weights. At long timescales, physical aging serves to significantly decrease the creep compliance and creep rate of all the materials tested.Nicholson, Lee M. and Whitley, Karen S. and Gates, Thomas S.Langley Research CenterAGING (MATERIALS); GLASS; MOLECULAR WEIGHT; TEMPERATURE EFFECTS; THERMOPLASTICITY; VISCOELASTICITY; POLYIMIDES; CREEP TESTS; ERROR ANALYSIS; TIME TEMPERATURE PARAMETER; GLASS TRANSITION TEMPERATURE; DURABILITY
Book Synopsis The Role of Molecular Weight and Temperaturee on the Elastic and Viscoelastic Properties of a Glassy Thermoplastic Polyimide by : Lee M. Nicholson
Download or read book The Role of Molecular Weight and Temperaturee on the Elastic and Viscoelastic Properties of a Glassy Thermoplastic Polyimide written by Lee M. Nicholson and published by . This book was released on 2001 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biosurfaces written by Kantesh Balani and published by John Wiley & Sons. This book was released on 2015-01-23 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ideal as a graduate textbook, this title is aimed at helping design effective biomaterials, taking into account the complex interactions that occur at the interface when a synthetic material is inserted into a living system. Surface reactivity, biochemistry, substrates, cleaning, preparation, and coatings are presented, with numerous case studies and applications throughout. Highlights include: Starts with concepts and works up to real-life applications such as implantable devices, medical devices, prosthetics, and drug delivery technology Addresses surface reactivity, requirements for surface coating, cleaning and preparation techniques, and characterization Discusses the biological response to coatings Addresses biomaterial-tissue interaction Incorporates nanomechanical properties and processing strategies
Book Synopsis Chemistry and Properties of Crosslinked Polymers by : Labana
Download or read book Chemistry and Properties of Crosslinked Polymers written by Labana and published by Elsevier. This book was released on 2012-12-02 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemistry and Properties of Crosslinked Polymers provides a description of the structure property relationship, chemistry, and methods of characterization of crosslinked polymers. The book presents papers that discuss experimental techniques to study polymer network structure; deduction of information on network structure from theoretical considerations; interpenetrating polymer networks; crosslinked polymers for high temperature applications; a novel class of polyurethanes; crosslinking agents; and the influence of crosslinking agents on thermal and mechanical properties. The text will be of value to materials scientists and engineers, chemists, and researchers in the field of polymer science.
Book Synopsis The Effect of Molecular Orientation on the Mechanical Properties of Polystyrene by : T. T. Jones
Download or read book The Effect of Molecular Orientation on the Mechanical Properties of Polystyrene written by T. T. Jones and published by Elsevier. This book was released on 2013-10-22 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Effect of Molecular Orientation on the Mechanical Properties of Polystyrene presents the results of a study that investigated the effect of molecular orientation on the mechanical properties of polystyrene. Oriented sheets of two commercial homopolystyrenes (PSA and PSB) differing in molecular weight, rheological and glass transition temperature properties were prepared by sheet extrusion and drawing. The properties of the resulting sheets were examined at seven different laboratories in Europe. The study focused on length reversion ratio, birefringence, orientation stress, shrinkage stress, and various mechanical properties such as rupture stress and strain, the specific energy of rupture, and sonic modulus and relaxation modulus. Impact behavior and environmental stress cracking behavior were also evaluated. One of the findings was that oriented polymers subjected to lateral strains can develop catastrophic crack growth when immersed in an active liquid. The onset of the cracks depends on the lateral strain imposed as well as the degree of orientation. PSB was more resistant than PSA. This monograph should be a useful resource for chemists.
Book Synopsis Mechanical Performance of Glassy Polymers by : C.C.W.J. Clarijs
Download or read book Mechanical Performance of Glassy Polymers written by C.C.W.J. Clarijs and published by . This book was released on 2019 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NASA Langley Scientific and Technical Information Output: 1999 by :
Download or read book NASA Langley Scientific and Technical Information Output: 1999 written by and published by . This book was released on 2000 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-temperature Properties and Applications of Polymeric Materials by : Martin R. Tant
Download or read book High-temperature Properties and Applications of Polymeric Materials written by Martin R. Tant and published by . This book was released on 1995 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents information on the synthesis, processing, and characterization of polymers and polymer composites for high performance materials needing to withstand high temperatures. Discusses the synthesis and properties of new thermally stable polymers. Includes new approaches for modeling material processing and decomposition. Provides a broad perspective by examining the science and engineering aspects of polymeric materials for high-temperature applications.
Book Synopsis Computational Materials: Modeling and Simulation of Nanostructured Materials and Systems by : Thomas S. Gates
Download or read book Computational Materials: Modeling and Simulation of Nanostructured Materials and Systems written by Thomas S. Gates and published by . This book was released on 2003 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polyamides as Engineering Thermoplastic Materials by : I. B. Page
Download or read book Polyamides as Engineering Thermoplastic Materials written by I. B. Page and published by iSmithers Rapra Publishing. This book was released on 2000 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis In-Silico Approaches to Macromolecular Chemistry by : Minu Elizabeth Thomas
Download or read book In-Silico Approaches to Macromolecular Chemistry written by Minu Elizabeth Thomas and published by Elsevier. This book was released on 2023-02-28 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational approaches offer researchers unique insights into the structure, characteristics, and properties of macromolecules. However, with applications across a broad range of areas, various methods have been developed for exploring macromolecules in in silico; therefore, it can be difficult for researchers to select the most appropriate method for their specific needs. Covering both biopolymers and synthetic polymers, In-Silico Approaches to Macromolecular Chemistry familiarizes readers with the theoretical tools and software appropriate for such studies. In addition to providing essential background knowledge on both computational tools and macromolecules, the book presents in-depth studies of in silico macromolecule chemistry, discusses and compares these with experimental studies, and highlights the future potential for such approaches. Written by specialists in their respective fields, this book helps students, researchers, and industry professionals gain a clear overview of the field, and furnishes them with the knowledge needed to understand and select the most appropriate tools for conducting and analyzing computational studies. - Highlights in silico studies of both bio and synthetic macromolecules in one book - Supports both learners and experts though a combination of detailed guidance and perspectives on the future potential for in silico approaches to macromolecules - Familiarizes readers with theoretical tools and software helping them select the best approach for their specific needs
Book Synopsis NASA Langley Scientific and Technical Information Output 2000 by :
Download or read book NASA Langley Scientific and Technical Information Output 2000 written by and published by . This book was released on 2001 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
