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Orientational Pair Correlation Polar Order Parameter And Temporal Stability In The Second Harmonic Generation Of Amorphous Polymers
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Book Synopsis Orientational Pair Correlation, Polar Order Parameter and Temporal Stability in the Second Harmonic Generation of Amorphous Polymers by :
Download or read book Orientational Pair Correlation, Polar Order Parameter and Temporal Stability in the Second Harmonic Generation of Amorphous Polymers written by and published by . This book was released on 1993 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the second harmonic generation (SHG) signal were made on the DAN/PMMA guest/host system as a function of the nonlinear optical (NLO) chromophore concentration and the poling field strength. The temporal stability of the SHG signal, after the poling field was removed, was also investigated. The polar orientational order parameters, L(sub 33) and L(sub 31) (see text for definition), were deduced from the second order nonlinear susceptibility. Both of the polar orientational order parameters and the relaxation time of the nonlinear susceptibility were found to increase with increasing NLO chromophore concentration. The concentration dependence was interpreted as due to the anisotropic intermolecular interaction, particularly the dipole-dipole interaction. The anisotropic intermolecular interaction introduces the orientational pair correlation function which enhances the polar order as well as the temporal stability of the NLO effect.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Science Abstracts written by and published by . This book was released on 1995 with total page 1874 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1993 with total page 1400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1993 with total page 1452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polar Order and Relaxation of Second Order Nonlinear Optical Susceptibility in an Electric Field Polarized Amorphous Polymer by :
Download or read book Polar Order and Relaxation of Second Order Nonlinear Optical Susceptibility in an Electric Field Polarized Amorphous Polymer written by and published by . This book was released on 1993 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dependence of the second harmonic generation (SHG) signal of an amorphous polymer system containing nonlinear optical (NLO) chromophores on the polarizing electric field is investigated. It is shown that under a weak poling field condition, the SHG intensity is proportional to E sub p2, provided that the polarizing electric field E sub p is greater than a threshold field, E sub s. Above E sub s the macroscopic polar orientational order is established. The lengthening of the relaxation time for polar orientational order with increasing E sub p is also observed. Theoretical analysis shows that the relaxation time is proportional to the polar order initially induced by the polarizing field. Experiments have been carried out to confirm the theoretical prediction.
Download or read book Cinderella Writer written by and published by . This book was released on 1996 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hawaiʻi - Authors - Books - Deborah Iida.
Book Synopsis Structure of the Polymer Amorphous State by : Kozlov
Download or read book Structure of the Polymer Amorphous State written by Kozlov and published by CRC Press. This book was released on 2019-12 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: The basic problem of polymer physics is obtaining â ~structure-propertiesâ (TM) correlations for their future application for practical purposes. However, these cannot be obtained without the development of a quantitative model of the polymer structure. This problem has been actively investigated during the last 45 years, which resulted in obtaining a great amount of experimental (mostly indirect) proofs of existence of the local order in the polymer amorphous state. Now, the time has come for creating a structural model of polymer basing based on the local order ideas. The cluster model, as presented in this monograph, of the polymer amorphous state structure represents the realization of such attempts. The development of this cluster model is based on well-known experimental observation: the behavior of glassy polymers in the area of stimulated high-elasticity plateau is described in the framework of rubber elasticity concepts. This gives an opportunity to present the local order (cluster) zone as a multifunctional entanglement of the physical network consisting of several collinear closely packed segments of different macromolecules (the amorphous analogue of crystallite with extended chains) and surrounded by a packless matrix. An independent method for assessing local order zone fraction in the structure has been elaborated. Segment length in the cluster equals the length of the chain statistical segment that gives a correlation between molecular and structural parameters of the polymer. Application of the cluster model allowed description and obtaining of analytical â ~structure-propertiesâ (TM) correlations for many processes proceeding in polymers: elasticity, yielding, degradation, transport, some thermodynamic processes, structural relaxation, plasticization, structural stabilization at thermo-oxidative degradation, etc. The relation between the cluster model and some modern physical concepts, for instance fractal analysis, fluctuation free volume kinetic
Book Synopsis Order in the Amorphous State of Polymers by : Steven E. Keinath
Download or read book Order in the Amorphous State of Polymers written by Steven E. Keinath and published by . This book was released on 2014-01-15 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Properties of Materials by : Robert E. Newnham
Download or read book Properties of Materials written by Robert E. Newnham and published by Oxford University Press. This book was released on 2005 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crystals are sometimes called 'Flowers of the Mineral Kingdom'. In addition to their great beauty, crystals and other textured materials are enormously useful in electronics, optics, acoustics and many other engineering applications. This richly illustrated text describes the underlying principles of crystal physics and chemistry, covering a wide range of topics and illustrating numerous applications in many fields of engineering using the most important materials today. Tensors, matrices, symmetry and structure-property relationships form the main subjects of the book. While tensors and matrices provide the mathematical framework for understanding anisotropy, on which the physical and chemical properties of crystals and textured materials often depend, atomistic arguments are also needed to quantify the property coefficients in various directions. The atomistic arguments are partly based on symmetry and partly on the basic physics and chemistry of materials. After introducing the point groups appropriate for single crystals, textured materials and ordered magnetic structures, the directional properties of many different materials are described: linear and nonlinear elasticity, piezoelectricity and electrostriction, magnetic phenomena, diffusion and other transport properties, and both primary and secondary ferroic behavior. With crystal optics (its roots in classical mineralogy) having become an important component of the information age, nonlinear optics is described along with the piexo-optics, magneto-optics, and analogous linear and nonlinear acoustic wave phenomena. Enantiomorphism, optical activity, and chemical anisotropy are discussed in the final chapters of the book.
Book Synopsis Liquid Crystalline and Mesomorphic Polymers by : Valery P. Shibaev
Download or read book Liquid Crystalline and Mesomorphic Polymers written by Valery P. Shibaev and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the various new directions in modern polymer science, the design and investigation of liquid crystal (LC) polymers have been the ones growing most actively and fruitfully. In spite of that, the possible formation of an anisotropic LC phase was only demonstrated theoretically for the first time in the 1950s by Onsager [1] and Flory [2], and then experimentally verified in the studies with polypeptides solutions. In essence, the studies of these LC lyotropic systems did not deviate from the theme of purely academic interest. It was at the beginning of the 1970s that the experimental "explosion" occurred, when aromatic polyamides were synthesized and their ability to form LC solutions in certain very aggressive solvents was discovered. The search for practical applications of such LC systems was crowned with the successful creation of the new generation of ultrastrong high-modulus ther mostable fibers, such as the Kevlar, due to the high degree of order of the macromolecules in the anisotropic LC state. In fact, these investigations coincided with the swift emergence on the practical "scene" of thermotropic low-molar-mass liquid crystals, with the use of these materials in microelectronics and electro optics (figures and let ters indicators, displays in personal computers, and flat TV, etc.). Polymer scientists also began to develop methods of synthesizing thermotropic LC polymers by incorporating mesogenic fragments in the main (main-chain LC polymers) or side branchings of the macromolecules (side-chain or comb shaped polymers).
Book Synopsis Organic Optoelectronic Materials by : Yongfang Li
Download or read book Organic Optoelectronic Materials written by Yongfang Li and published by Springer. This book was released on 2015-05-30 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reviews the latest trends in organic optoelectronic materials. Each comprehensive chapter allows graduate students and newcomers to the field to grasp the basics, whilst also ensuring that they have the most up-to-date overview of the latest research. Topics include: organic conductors and semiconductors; conducting polymers and conjugated polymer semiconductors, as well as their applications in organic field-effect-transistors; organic light-emitting diodes; and organic photovoltaics and transparent conducting electrodes. The molecular structures, synthesis methods, physicochemical and optoelectronic properties of the organic optoelectronic materials are also introduced and described in detail. The authors also elucidate the structures and working mechanisms of organic optoelectronic devices and outline fundamental scientific problems and future research directions. This volume is invaluable to all those interested in organic optoelectronic materials.
Book Synopsis Simulation Methods for Polymers by : Michael Kotelyanskii
Download or read book Simulation Methods for Polymers written by Michael Kotelyanskii and published by CRC Press. This book was released on 2004-03-01 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Materials for Nonlinear Optics by : Seth Richard Marder
Download or read book Materials for Nonlinear Optics written by Seth Richard Marder and published by . This book was released on 1991 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume exposes the chemistry community to the critical role that chemistry can and must play in nonlinear optics research. In addition, it brings together those researchers who synthesize and characterize materials from a variety of systems, with those who build devices, giving chemists, physicists, and engineers a greater appreciation for the opportunities that lie ahead in understanding and developing nonlinear optical materials. The volume begins with a discussion of polarizability and hyperpolarizability from the view of a chemist. Tutorial chapters dealing with the fundamental structures and properties of second- and third-order nonlinear optical materials, measurement and characterization of these systems, theoretical considerations, application of these systems to devices, and overviews of the current state of affairs in both organic and inorganic nonlinear optical materials follow.
Book Synopsis Modeling and Simulation in Polymers by : Purushottam D. Gujrati
Download or read book Modeling and Simulation in Polymers written by Purushottam D. Gujrati and published by John Wiley & Sons. This book was released on 2010-03-30 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling a gap in the literature and all set to become the standard in this field, this monograph begins with a look at computational viscoelastic fluid mechanics and studies of turbulent flows of dilute polymer solutions. It then goes on discuss simulations of nanocomposites, polymerization kinetics, computational approaches for polymers and modeling polyelectrolytes. Further sections deal with tire optimization, irreversible phenomena in polymers, the hydrodynamics of artificial and bacterial flagella as well as modeling and simulation in liquid crystals. The result is invaluable reading for polymer and theoretical chemists, chemists in industry, materials scientists and plastics technologists.
Book Synopsis Local Structure from Diffraction by : S.J.L. Billinge
Download or read book Local Structure from Diffraction written by S.J.L. Billinge and published by Springer Science & Business Media. This book was released on 2006-02-04 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: This series of books, which is published at the rate of about one per year, addresses fundamental problems in materials science. The contents cover a broad range of topics from small clusters of atoms to engineering materials and involve chemistry, physics, materials science and engineering, with length scales ranging from Ångstroms up to millimeters. The emphasis is on basic science rather than on applications. Each book focuses on a single area of current interest and brings together leading experts to give an up-to-date discussion of their work and the work of others. Each article contains enough references that the interested reader can access the relevant literature. Thanks are given to the Center for Fundamental Materials Research at Michigan State University for supporting this series. M.F. Thorpe, Series Editor E-mail: thorpe @ pa.msu.edu East Lansing, Michigan PREFACE One of the most challenging problems in the study of structure is to characterize the atomic short-range order in materials. Long-range order can be determined with a high degree of accuracy by analyzing Bragg peak positions and intensities in data from single crystals or powders. However, information about short-range order is contained in the diffuse scattering intensity. This is difficult to analyze because it is low in absolute intensity (though the integrated intensity may be significant) and widely spread in reciprocal space.
Book Synopsis Lectures On Phase Transitions by : A S Shumovsky
Download or read book Lectures On Phase Transitions written by A S Shumovsky and published by World Scientific. This book was released on 1990-11-30 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book treats the problem of phase transitions, emphasizing the generality and universality of the methods and models used. The course is basically concentrated on the problems of vacuum degeneration in macroscopic systems and a fundamental concept of quasiaverages by Bogolubov playing a special role in the theory of phase transitions and critical phenomena. An analysis of the connection between phase transition and spontaneous symmetry breaking in a macroscopic system allows a unique description of both first- and second-order phase transitions.The unique features of this book are:(i) a unique approach of describing first — as well as second-order phase transitions, based on the Bogolubov concept of quasi-averages.(ii) a detailed presentation of the material and at the same time a review of modern problems.(iii) a general character of developed ideas that could be applied to various particular systems of condensed matter physics, nuclear physics and high-energy physics.
