Author: Jeffrey Charles Haley
Publisher:
ISBN:
Category :
Languages : en
Pages : 624

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Author: Jeffrey Alan Zawada
Publisher:
ISBN:
Category : Polymers
Languages : en
Pages : 340

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Book Description

Author: Chang Dae Han
Publisher: Oxford University Press
ISBN: 0195345983
Category : Technology & Engineering
Languages : en
Pages : 728

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Book Description
Volume 1 presents first fundamental principles of the rheology of polymeric fluid including kinematics and stresses of a deformable body, the continuum theory for the viscoelasticity of flexible homogeneous polymeric liquids, the molecular theory for the viscoelasticity of flexible homogeneous polymeric liquids, and the experimental methods for the measurement of the rheological properties of poylmeric liquids. The materials presented are intended to set a stage for the subsequent chapters by introducing the basic concepts and principles of rheology, from both phenomenological and molecular perspectives, ofstructurally simple flexible and homogeneous polymeric liquids. Next, this volume presents the rheological behavior of structurally complex polymeric materials including miscible polymer blends, block copolymers, liquid-crystalline polymers, thermoplastic polyurethanes, immiscible polymer blends, perticulare-filled polymers, organoclay nanocomposites, molten polymers with dissolved gas, and thermosts.

Author: Zhiyi Yang
Publisher:
ISBN:
Category : Polymers
Languages : en
Pages : 233

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"Poly(4-vinylphenol) (PVPh) was blended with four different polymers: poly(vinyl methyl ether) (PVME), poly(vinyl acetate) (PVAc), poly(2-vinylpyridine) (P2VP), and poly(4-vinylpyridine) (P4VP) by solvent casting. The miscibility of these four PVPh-based blend systems was investigated using differential scanning calorimetry (DSC) and the composition-dependent glass transition temperature (Tg) was predicted by a thermodynamic theory. The hydrogen bonds between phenolic group in PVPh and either group, carbonyl group or pyridine group was confirmed by Fourier transform infrared (FTIR) spectroscopy. The fraction of hydrogen bonds was calculated by the Coleman-Graf-Painter association model. Linear dynamic viscoelasticity of four PVPh-based miscible polymer blends with hydrogen bonding was investigated. Emphasis was placed on investigating how the linear dynamic viscoelasticity of miscible polymer blends with specific interactive might be different from that of miscible polymer blends without specific interaction. We have found that an application of time-temperature superposition (TTS) to the PVPh-based miscible blends with intermolecular hydrogen bonding is warranted even when the difference in the component glass transition temperatures is as large as about 200°C, with TTS fails for miscible polymer blends without specific interactions. On the basis of such an observation, we have concluded that hydrogen bonding suppressed concentration fluctuations in PVPh-based miscible blends. It has been found that both the intra-association (self-association) of the phyenoxy hydroxyl groups in PVPh and inter-association (intermolecular interactions) between the constituent components have a profound influence on the frequency dependence of dynamic moduli in the terminal region of the PVPh-based miscible blend systems investigated. Hydrogenated functional polynorbornenes (HFPNBs) were synthesized and they were used to investigate the miscibility and rheology of HFPNB-based miscible blends with hydrogen bonding. Specifically, functional norborneses with carboxylic ( -COOH) group of hydroxyl ( -OH) group were first synthesized and then they were polymerized, via ring-opening metathesis polymerization followed by hydrogenation, to obtain HFPNBs, HPNBCOOH and HPNBOH. Subsequently, the miscibility of binary blends consisting of (1) HPBNCOOH and polycarbonate (PC), (2) HPBNCOOH and poly(2-vinylpyridine) (P2VP), and (3) HPBNOH and PC was investigated using DSC and FTIR spectroscopy. It has been found that both PC/HPBNCOOH and P2VP/HPBNCOOH blend systems exhibit a broad, single glass transition over the entire blend compositions as determined by DSC, indicating that the respective blend systems are miscible, and they form hydrogen bonds as determined by FTIR spectroscopy. On the other hand, PC/HPBNOH blends were found to exhibit two glass transition temperatures, indicating that the blends are not miscible. The dynamic oscillatory shear rheometry has shown than reduced log G' versus log a(T) plots, and also log G' versus log G" plots of PC/HPBNCOOH and P2VP/HPBNCOOH blend systems are independent of temperature. We have concluded that an application of TTS to the miscible polymer blends with hydrogen bonding is warranted although the difference in component glass transition temperatures is as large as 91 °C for the PC/HPNBCOOH blend system."--Abstract.

Author: Yiyong He
Publisher:
ISBN:
Category :
Languages : en
Pages : 360

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Author: Y.G. Yanovsky
Publisher: Springer Science & Business Media
ISBN: 9401121168
Category : Science
Languages : en
Pages : 309

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Book Description
The present book is devoted to a rapidly developing field of science which studies the behavior of viscoelastic materials under the influence of deformation~the rheology of polymers. Rheology has long been treated as the theoretical foundation of polymer processing, and from this standpoint it is difficult to overesti mate its importance in practice. Rheology plays an important role in developing our ideas on the nature of viscoelastic behavior in connection with the structural features of polymers and composites based on them. This expands the possibilities of employing rheological methods to characterize a variety of materials and greatly magnifies the interest in this field of research. The rheological properties of polymer systems are studied experimen tally, chiefly under conditions of shear and tensile strains. One explana tion is that many aspects of polymer material processing are associated with the stretching of melts or a combination of shear and tensile strains. In scientific investigations, either periodic or continuous conditions of shear deformation are employed. Each mode provides widespread infor mation. In periodic deformation, most attention is generally given to conditions with low deformation amplitudes that do not alter the structure of the polymer system during an experiment (the region of linear deformation conditions). Here the viscoelastic parameters are generally determined with respect to the frequency. Continuous deforma tion involves considerable strains, and may be attended by significant reversible and irreversible changes in the structure of a polymer.

Author: Sabu Thomas
Publisher: Elsevier
ISBN: 0128169567
Category : Technology & Engineering
Languages : en
Pages : 326

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Book Description
Rheology of Polymer Blends and Nanocomposites: Theory, Modelling and Applications focuses on rheology in polymer nanocomposites. It provides readers with a solid grounding in the fundamentals of rheology, with an emphasis on recent advancements. Chapters explore potential future applications for nanocomposites and polymer blends, giving readers a thorough understanding of the specific features derived from rheology as a tool for the study of polymer blends and nanocomposites. This book is ideal for industrial and academic researchers in the field of polymer blends and nanocomposites, but is also a great resource for anyone who wants to learn about the applications of rheology. - Sets out the principles of rheology as it is applied to polymer blends and nanocomposites - Demonstrates how rheological techniques are best applied to different classes of nanocomposites - Assesses the opportunities and major challenges of rheological approaches to polymer blends and nanocomposites

Author: A.A. Collyer
Publisher: Springer Science & Business Media
ISBN: 9781851665570
Category : Technology & Engineering
Languages : en
Pages : 494

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Book Description

Author: Chang Dae Han
Publisher: Oxford University Press, USA
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 736

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Book Description
Volume 1 presents first fundamental principles of the rheology of polymeric fluid including kinematics and stresses of a deformable body, the continuum theory for the viscoelasticity of flexible homogeneous polymeric liquids, the molecular theory for the viscoelasticity of flexible homogeneous polymeric liquids, and the experimental methods for the measurement of the rheological properties of poylmeric liquids. The materials presented are intended to set a stage for the subsequent chapters by introducing the basic concepts and principles of rheology, from both phenomenological and molecular perspectives, ofstructurally simple flexible and homogeneous polymeric liquids. Next, this volume presents the rheological behavior of structurally complex polymeric materials including miscible polymer blends, block copolymers, liquid-crystalline polymers, thermoplastic polyurethanes, immiscible polymer blends, perticulare-filled polymers, organoclay nanocomposites, molten polymers with dissolved gas, and thermosts.

Author: Avraam I. Isayev
Publisher: John Wiley & Sons
ISBN: 3527805222
Category : Science
Languages : en
Pages : 422

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Book Description
A complete and timely overview of the topic, this volume imparts knowledge of fundamental principles and their applications for academicians, scientists and researchers, while informing engineers, industrialists and entrepreneurs of the current state of the technology and its utilization. Each article is uniformly structured for easy navigation, containing the latest research & development and its basic principles and applications, examples of case studies, laboratory and pilot plant experiments, as well as due reference to the published and patented literature.