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| Author | : Dong Won Park |
| Publisher | : |
| Total Pages | : 254 |
| Release | : 1991 |
| Genre | : |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 13 |
| Release | : 1993 |
| Genre | : |
| ISBN | : |
Mechanical properties of polymer blends can be improved by the addition of block copolymers as compatibilizers. The objective of this study has been to systematically investigate the effect of added block copolymer to gain an understanding of the factors -- such as the amount, size, and structure of block copolymer -- that control the efficacy of the compatibilization. The rate of particle coarsening that occurs at the late stage of phase separation has been shown to be affected in terms of sensitivity by the presence of even a very small amount of block copolymer. On the assumption that the late stage proceeds by the Lipshitz-Slyozov mechanism, one can estimate the change in the interfacial tension resulting from the adsorption of block copolymer at the interface. The larger the size of the block copolymer, the more pronounced the reduction in the particle coarsening rate. When polymers are melt-blended, a larger block copolymer additive is again found to be more effective than smaller amounts of block copolymer.
| Author | : John A. Manson |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 520 |
| Release | : 2012-12-06 |
| Genre | : Technology & Engineering |
| ISBN | : 1461517613 |
The need for writing a monograph on polymer blends and composites became apparent during presentation of material on this subject to our advanced polymers class. Although the flood of important research in this area in the past decade has resulted in many symposia, edited collections of papers, reviews, contributions to scientific journals, and patents, apparently no organized presentation in book form has been forthcoming. In a closely connected way, another strong impetus for writing this monograph arose out of our research programs in the Materials Research Center at Lehigh University. As part of this effort, we had naturally compiled hundreds of references and become acquainted with many leaders in the field of blend and composite research. Perhaps the most important concept stressed over and over again is that engineering materials are useful because of their complexity, not in spite of it. Blends and composites are toughened because many modes of resistance to failure are available. Although such multimechanism processes are diffi cult to describe with a unified theory. we have presented available develop ments in juxtaposition with the experimental portions. The arguments somewhat resemble the classical discussion of resonance in organic chemistry, where molecular structures increase in stability as more electronic configura tions become available.
| Author | : Charef Harrats |
| Publisher | : CRC Press |
| Total Pages | : 349 |
| Release | : 2005-09-29 |
| Genre | : Science |
| ISBN | : 1000611736 |
Micro- and Nanostructured Multiphase Polymer Blend Systems: Phase Morphology and Interfaces focuses on the formation of phase morphology in polymer blends and copolymers and considers various types of blends including thermosets, thermoplastics, thermoplastic vulcanizates, and structured copolymers. The book carefully debates the processing
| Author | : Ashish Kumar Khandpur |
| Publisher | : |
| Total Pages | : 434 |
| Release | : 1995 |
| Genre | : |
| ISBN | : |
| Author | : Sabu Thomas |
| Publisher | : John Wiley & Sons |
| Total Pages | : 972 |
| Release | : 2015-02-09 |
| Genre | : Science |
| ISBN | : 3527331530 |
Filling the gap for a reference dedicated to the characterization of polymer blends and their micro and nano morphologies, this book provides comprehensive, systematic coverage in a one-stop, two-volume resource for all those working in the field. Leading researchers from industry and academia, as well as from government and private research institutions around the world summarize recent technical advances in chapters devoted to their individual contributions. In so doing, they examine a wide range of modern characterization techniques, from microscopy and spectroscopy to diffraction, thermal analysis, rheology, mechanical measurements and chromatography. These methods are compared with each other to assist in determining the best solution for both fundamental and applied problems, paying attention to the characterization of nanoscale miscibility and interfaces, both in blends involving copolymers and in immiscible blends. The thermodynamics, miscibility, phase separation, morphology and interfaces in polymer blends are also discussed in light of new insights involving the nanoscopic scale. Finally, the authors detail the processing-morphology-property relationships of polymer blends, as well as the influence of processing on the generation of micro and nano morphologies, and the dependence of these morphologies on the properties of blends. Hot topics such as compatibilization through nanoparticles, miscibility of new biopolymers and nanoscale investigations of interfaces in blends are also addressed. With its application-oriented approach, handpicked selection of topics and expert contributors, this is an outstanding survey for anyone involved in the field of polymer blends for advanced technologies.
| Author | : Ajitha A. R |
| Publisher | : Elsevier |
| Total Pages | : 640 |
| Release | : 2019-10-10 |
| Genre | : Technology & Engineering |
| ISBN | : 0128162880 |
Compatibilization of Polymer Blends: Micro and Nano Scale Phase Morphologies, Interphase Characterization and Properties offers a comprehensive approach to the use of compatibilizers in polymer blends, examining both fundamental and advanced knowledge in the field. The book begins by introducing polymer blends, describing thermodynamics, miscibility, and phase separation, and explaining the main concepts of compatibilization. Other sections cover theoretical approaches for nearly compatible blends, incompatible blends, nanofillers, physical compatibilization, reactive compatibilization, morphological and structural characterization, and physico-mechanical characterization. Finally, key application areas are covered, including biomedical applications, packaging and automobile engineering. While this book will be a highly valuable reference source for academics, researchers and postgraduate students interested in polymer blends, it will also be ideal for anyone involved in the fields of polymer science, polymer chemistry, polymer physics, materials science, scientists, R&D professionals, and engineers in involved in the development or engineering of polymer products. Offers detailed and systematic coverage of essential and advanced topics relating to the compatibilization of polymer blends Presents a critical analysis of the effect of compatibilization on morphology and thermal, mechanical, electrical and viscoelastic properties of polymer blends Draws on novel studies and state-of-the-art research, discussing the latest issues and developments
| Author | : Francisco Balta Calleja |
| Publisher | : CRC Press |
| Total Pages | : 604 |
| Release | : 2000-06-09 |
| Genre | : Technology & Engineering |
| ISBN | : 9780824703820 |
A summary of block copolymer chemical structures and synthesis. It discusses physical methods of characterization such as computer simulation, microhardness, dielectric spectroscopy, thermal mechanical relaxation, ultrasonic characterization, transmission electron microscopy, X-ray scattering, and NMR, among others. It also outlines rheological and processing parameters in the multiphase polymer systems with stable microstructures.
| Author | : Volker Altstädt |
| Publisher | : |
| Total Pages | : 143 |
| Release | : |
| Genre | : Chemistry |
| ISBN | : 9783038423652 |
The market is continuously looking for substitutes for expensive polymers or tailor made polymers for specific applications. Therefore, polymer blends are gaining more interest since they possess a great potential to fulfill these needs. Blending not only results in better final properties, but can also improve the processing behavior and reduce costs. In the field of polymer blends, there are numerous parameters that influence the morphology, e.g., viscosity ratio, blend composition, shear conditions, and blend ratio. There is still a great deal of potential to scientifically exploit the possibilities of blend technology, which is necessary to obtain a foundation based on science, engineering, technology, and applications in order to make it possible to tailor polymer blends as desired.However, combining two or more different polymers to receive favorable properties by blending often results in immiscible polymer blends. This immiscibility goes hand-in-hand with phase separation leading to weak mechanical properties. The high interfacial tension causing this can be reduced by compatibilization of polymer blends. There are different methods to achieve this, such as adding block and graft copolymers, reactive polymers to form block and graft copolymers, nanoparticles or organic molecules. Using suitable compatibilizers, not only is the interfacial adhesion between matrix and its blends reduced, but also the dispersion of the dispersed phase is improved, the adhesion between the phases is enhanced and the morphology is stabilized. This can lead to improved mechanical and morphological properties.Designing new polymer blends or improving the properties of immiscible polymer blends by compatibilization is very challenging, but an excellent way to exploit the full potential of polymers for applications and their varied needs.This Special Issue is a source of information on all recent aspects of polymer blend technology.
| Author | : Guojian Wang |
| Publisher | : Walter de Gruyter GmbH & Co KG |
| Total Pages | : 492 |
| Release | : 2020-10-26 |
| Genre | : Science |
| ISBN | : 3110594412 |
The book introduces fundamental principles, phase structure, mechanism, mechanical properties, and different types of multicomponent polymers. Rheological properties, graft copolymers, block copolymers and interpenetrating polymer networks are discussed in detail as well. With abundant illustrations, it is an essential reference for polymer chemists, material scientists and graduate students.
