Influence Of Pressure And Chemical Structure On Thermal Conductivity Of Polymers
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Influence Of Pressure And Chemical Structure On Thermal Conductivity Of Polymers
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Author : Richard Yii-Shin Chen
language : en
Publisher:
Release Date : 1974
Influence Of Pressure And Chemical Structure On Thermal Conductivity Of Polymers written by Richard Yii-Shin Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Materials at high pressures categories.
Influence Of Pressure And Chemical Structure On Thermal Conductivity Of Polymers
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Author : Richard Yii-Shen Chen
language : en
Publisher:
Release Date : 1971
Influence Of Pressure And Chemical Structure On Thermal Conductivity Of Polymers written by Richard Yii-Shen Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Materials at high pressures categories.
High Pressure Chemistry And Physics Of Polymers
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Author : A.L. Kovarskii
language : en
Publisher: CRC Press
Release Date : 1994-02-03
High Pressure Chemistry And Physics Of Polymers written by A.L. Kovarskii and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-02-03 with Technology & Engineering categories.
High-Pressure Chemistry and Physics of Polymers is devoted to covering all areas of high-pressure polymer materials science. Topics addressed include the synthesis of polymers, changes in reactivity, structural transformations, molecular dynamics, relaxation processes, deformational properties, chemical modification, and the effect of shock waves and shear stresses. The authors' contributions reflect over 60 years of Soviet study in the field of physico-chemistry conducted at the major former Soviet Institutes of Chemical Physics, Organic Chemistry, Polymer Chemistry, and Physical Chemistry. Fundamental topics such as compressibility of polymers, polymerization under pressure, viscoelastic/deformational properties, and polymer modification are discussed with an eye toward materials development for improving physical models and methods of calculating the changing parameters of materials under pressure. The book is a valuable reference to data on mechanisms of physical and chemical processes, in addition to new experimental data for improving physical models and methods of calculating changes in material characteristics under compression loads. High-Pressure Chemistry and Physics of Polymers will be an important reference for graduate students and practicing professionals in polymer chemistry and polymeric materials.
Thermophysical Properties Of Polymers
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Author : Yuli K. Godovsky
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Thermophysical Properties Of Polymers written by Yuli K. Godovsky and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
Among various branches of polymer physics an important position is occupied by that vast area, which deals with the thermal behav ior and thermal properties of polymers and which is normally called the thermal physics of polymers. Historically it began when the un usual thermo-mechanical behavior of natural rubber under stretch ing, which had been discovered by Gough at the very beginning of the last century, was studied 50 years later experimentally by Joule and theoretically by Lord Kelvin. This made it possible even at that time to distinguish polymers from other subjects of physical investigations. These investigation laid down the basic principles of solving the key problem of polymer physics - rubberlike elasticity - which was solved in the middle of our century by means of the statistical thermodynamics applied to chain molecules. At approx imately the same time it was demonstrated, by using the methods of solid state physics, that the low temperature dependence of heat capacity and thermal expansivity of linear polymers should fol low dependencies different from that characteristic of nonpolymeric solids. Finally, new ideas about the structure and morphology of polymers arised at the end of the 1950s stimulated the development of new thermal methods (differential scanning calorimetry, defor mation calorimetry), which have become very powerful instruments for studying the nature of various states of polymers and the struc tural heterogeneity.
The Thermal Transport Properties Of Polymers
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Author : David Hands
language : en
Publisher:
Release Date : 1976
The Thermal Transport Properties Of Polymers written by David Hands and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
The theories of thermal transport in polymers, which are mainly qualitative, are reviewed. The behaviour of amorphous polymers is better understood than that of partially crystalline ones. An apparatus for measuring the thermal conductivity of solid and molten polymers from room temperature to 250 degrees C is described. 'Edge effects' are eliminated by enclosing the heat source and samples inside the heat sink; hence guard rings are not used. The heat flow is three dimensional and the conductivity is obtained by a numerical calculation. Two disc shaped samples 48mm diameter and 2mm thick are required. An apparatus for measuring the thermal diffusivity of solid and molten polymers from room temperature to 250 degrees C is also described. Disc samples the same size as for the conductivity apparatus are used and the heat equation is again solved numerically. Conductivity and diffusivity results are reported for high density polyethylene, polypropylene, three grades of polymethyl methacrylate, three grades of polystyrene, and a series of carbon black filled natural rubber compounds. To show the effect of molecular weight, conductivity results for a range of polyethylene glycols and a range of silicone fluids are also presented.
Effect Of Pressure On Thermal Conductivity Of Polymers
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Author : David Mulligan
language : en
Publisher:
Release Date : 2001
Effect Of Pressure On Thermal Conductivity Of Polymers written by David Mulligan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Manufacturing processes categories.
Thermo Mechanical Properties Of Polymer Composites
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Author : Dr. Inamuddin
language : en
Publisher: Trans Tech Publications Ltd
Release Date : 2019-08-07
Thermo Mechanical Properties Of Polymer Composites written by Dr. Inamuddin and has been published by Trans Tech Publications Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-08-07 with Technology & Engineering categories.
This volume contains papers describing the results of some research in the area of application diffusion and transport phenomena in polymer composite materials and substances for the industrial and engineering goals. We hope that the presented papers will be interesting and useful for many engineers and researchers.
The Effects Of Molecular Structure On The Thermochemical Properties Of Phenolics And Related Polymers
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Author : John Abel Parker
language : en
Publisher:
Release Date : 1967
The Effects Of Molecular Structure On The Thermochemical Properties Of Phenolics And Related Polymers written by John Abel Parker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Char categories.
Phenolic resins and related polymers have been synthesized by established methods to provide different types of char-forming polymers for pyrolysis studies. Certain features of the molecular structure of these polymers which determine the char yield have been characterized. Pyrolysis studies have been carried out under both thermogravimetric conditions and in environments simulating reentry ablation to relate the char yields of these polymers to their molecular structure. It has been possible to account for the char-forming reactions of these phenolic derived resins in terms of a general pyrolysis mechanism for these classes of polymers. An analysis based on this mechanism has been developed which predicts from molecular structure the observed thermogravimetric char yields accurately over a range from 11 to 65 percent yield. This analysis makes it possible to control primary rates of vapor to char production as required for particular heat-shield applications. Composites have been developed from these polymers and have been tested under one-dimensional pyrolysis simulating reentry ablation. Up to applied heating rates of about 25 cal cm−2sec−1, the observed char yields agree quite closely with those obtained in thermogravimetric tests. It is tentatively concluded that the primary char-forming processes with these classes of materials are independent of polymer heating rate over a range of temperature rise rates varying from 2° to 5000° C per minute. With certain composites and at heating rates greater than 25 cal cm−2sec−1 an additional amount of char is formed due to secondary pyrolysis of vapor products within the char matrix induced by high char temperatures. These secondary processes seem to depend on surface temperature, impact pressure, and the chemical nature of the vapor products.
Thermal Stability Of Polymers
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Author : T. R Crompton
language : en
Publisher: Smithers Rapra
Release Date : 2012-05-08
Thermal Stability Of Polymers written by T. R Crompton and has been published by Smithers Rapra this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-05-08 with Science categories.
In recent years numerous research papers have been published on the changes in chemical structure and in physical properties of polymers when they are exposed to heat over a range of temperatures. For example, these changes can occur at any time during the injection moulding of the plastic, in the subsequent processing and in its end-use application when exposed to elevated temperatures. Thermal stability is a very important parameter which must be taken into account when selecting polymers whether for their use as constructional or engineering applications or in the packaging of food at high temperatures. The mechanisms by which such changes occur are many and it is important to know what these are and to be able to measure the rate of change of polymer structure and its dependence on temperature and time. Development of an understanding of the mechanisms of thermal degradation will help the chemist to develop materials with better thermal stability. This is particularly important in newer developments in engineering and aerospace. This book reviews in nine chapters the measurement of these properties in the main types of polymers in use today. Numerous techniques are discussed ranging from thermogravimetric analysis, differential scanning calorimetry, infrared and nuclear magnetic resonance based methods to pyrolytic techniques such as those based on pyrolysis, gas chromatography and mass spectrometry. The book is aimed at those engaged in the manufacture of polymers and the development of end-use applications. It is essential that students of polymer science should have a thorough understanding of polymer stability and an additional aim of the book is to help in the development of such an interest.
Thermal Characterization Of Polymeric Materials
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Author : Edith Turi
language : en
Publisher: Elsevier
Release Date : 2012-12-02
Thermal Characterization Of Polymeric Materials written by Edith Turi and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-02 with Technology & Engineering categories.
Thermal Characterization of Polymeric Materials is a critical review and a concise evaluation of the application of thermal analysis in polymer science and engineering. This book is divided into nine chapters that specifically tackle the instrumentation, theory, and a wide variety of applications of thermal characterization. The introductory chapters provide an overview of all aspects of thermal analytical methods and apparatus and the theory underlying the basic principles of thermal analysis. These chapters also examine the theories and functions of state for thermometry, dilatometry, thermomechanical analysis, calorimetry, thermogravimetry. These topics are followed by a discussion on single-component and multicomponent systems and their phase transitions, as influenced by concentration, pressure, deformation, molecular weight, and copolymerization. The subsequent chapters explore the influence of important chemical and physical parameters on the glass transition, crystallization, and melting of thermoplastic materials. The discussion then shifts to the theoretical aspects of polymer-polymer compatibility, phase separation, and miscibility in mixed polymer systems. This book further considers the thermal analysis in thermosets, elastomers, and fibers. The concluding chapters present the methods of obtaining information on the relative flammability properties of polymers, for screening fire retardant additives, and for studying the mechanism of flame inhibition. These chapters also look into the thermal analysis of antioxidants, stabilizers, lubricants, plasticizers, impact modifiers, and fire retardants. Polymer scientists and researchers will find this book invaluable.