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Advances in polymer nanocomposite technology   Publication : [S.l.] Nova Science Pub Inc 2010 . 445 p. , Polymer nanocomposites have revolutionised the research effort in the field of composites as they lead to the achievement of synergistic effects from the organic and inorganic components of the system and have led to the expansion of the spectrum of application of the commodity polymers to more advanced high end applications. Although a number of successful systems could be achieved, the inorganic filler still could not be optimally dispersed on nanometer scale in non polar polymers. Also, the thermal degradation of the surface modification of the inorganic component disturbs the organic inorganic phase compatibility and hence the resulting composite properties. In recent years, many new techniques have been employed to overcome these problems which include more advanced modification protocols of the inorganic filler, development of more thermally stable surface modification and altogether new synthesis technologies for polyolefin nanocomposites. There has also been a constant need to compare the composite properties with the property models and hence to be able to predict the properties of the similar systems in advance. However, until now, the conventional models developed for conventional micro composites were used, which in no way maps the nanocomposite systems. The recently developed statistical as well as finite element methods focusing the real nanocomposite morphologies have been more helpful for this purpose. Though a tremendous research focus lies on these polymer systems, there is also a need to give some attention to more environmentally friendly nanocomposite systems and to develop methods to achieve proper recycling. 26 cm. Date : 2010 Disponibilité : Exemplaires disponibles: La bibliothèque des sciences de l'ingénieur (2),
Advances in polyolefin nanocomposites   Publication : [S.l.] CRC Press 2010 . 414 p. , With the advent of polymer nanocomposites, research on polyolefin nanocomposites has grown exponentially. Correcting the deficiency of a meaningful text on these important materials, Advances in Polyolefin Nanocomposites: Sums up recent advances in nanoscale dispersion of filler in polyolefins Presents a basic introduction to polyolefin nanocomposite technology for the readers new to this field Provides insights on the use of technologies for polyolefins nanocomposites for commercial application Includes contributions from the most experienced researchers in the field Offers insights into the commercial usage of techniques The text uses theoretical models to illustrate the organic–inorganic interfaces in polyolefins and also provides a detailed description of the recently developed models for property prediction of these nanocomposites. It concentrates on developments with not only aluminosilicate fillers, but also with equally important fillers like layer double hydroxides and nanotubes. The authors review polyolefin nanocomposite technology and methodologies of generation, properties and generation of composite blends, and advances in synthesis of nanocomposites using solution blending methods. The book covers theoretical and experimental considerations of clay surface modification and the importance and effect of various prominent filler categories. 26 cm. Date : 2010 Disponibilité : Exemplaires disponibles: La bibliothèque des sciences de l'ingénieur (1),
Barrier properties of polymer clay nanocomposites   Publication : [S.l.] Nova Science Pub Inc 2010 . 271 p. , Polymer nanocomposites are organic-inorganic hybrids where the high aspect ratio inorganic filler can be delaminated in the organic matrix at the nanometer scale, thus leading to significant enhancement of composite properties at very low filler volume fractions. With the advancement of polymer nanocomposites technology, significant enhancements in mechanical and thermal properties of the composites could be achieved. However, other important properties like gas barrier properties, which form an absolutely necessary requirement for the use of materials in packaging and storage applications, were relatively neglected. By improving the barrier performance of the materials by incorporation of high aspect ratio nano platelets, one can expect to reduce the thickness of the commercial packaging laminates and other materials where thick material is required to be used to provide barrier to various gases. This can thus lead to significant amount of savings in the material costs and can make the polymer materials more light and also transparent as the nano scale dispersed filler would not scatter light. This book examines the factors affecting barrier properties enhancement in polar polymer matrices, which are different from case when non polar polymers are involved, thus indicating that the performance has to be quantised by case-by-case basis. The commonly used conventional models for prediction of permeation reduction are also less representative of the true microstructure of the nanocomposites. Thus the barrier performance of the polymer nanocomposite materials is also explored, separate from the more bulk based mechanical properties. 26 cm. Date : 2010 Disponibilité : Exemplaires disponibles: La bibliothèque des sciences de l'ingénieur (1),
Polymer nanocomposites : advances in filler surface modification techniques   Publication : [S.l.] Nova Science Pub Inc 2009 . 216 p. , Polymer nanocomposites revolutionised the research in this field owing to the tremendous improvement in the composite properties at very low filler volume fraction. The surface modification of the filler, generally layered silicate montmorillonite clay, is required to compatibilise the organic and inorganic phases. The inorganic clay was modified conventionally with alkyl ammonium ions and the exfoliated nanocomposites with polar polymers could be formed where the clay could be dispersed at nanometer scale. During the initial phase of nanocomposite developments, only ammonium ions of fixed chain length were exchanged on the clay surface. However, this technology suffered when polyolefins and other non-polar polymers were used owing to the difficulties in dispersion of polar clay in the hydrophobic matrices. At best, only partially exfoliated composites could be formed by using these ammonium modified clays. To circumvent these limitations, two possible routes have been followed. By polarising the polymer matrix (e.g. by addition of compatibilisers or surfactants), one can achieve compatibilisation between the organic-inorganic phases. However, this technology leads to deterioration of nanocomposite properties even though better delamination is achieved. On the other hand, one can also focus on the more efficient modification of the filler surface so that the residual polarity after modification of the surface with conventional ammonium ions is also eliminated. A number of new clay surface modification techniques have been developed in the recent years which help in the generation of more exfoliated polymer nanocomposites. These techniques do not rely on the ion exchange of fixed chain length ammonium ions, but lead to generation/exchange of long and polydisperse polymer chains. These techniques include grafting of polymers to the clay surface, grafting of polymers from the clay surface, controlled living polymerisation from the clay surface, in situ generation of polyolefins from the clay surface and clay surface reactions etc. and form very robust technologies for the complete organophilisation of the clay surface. The generation of thick brushes around the clay surface owing to the better surface modification leads to better coverage of the electrostatic forces binding the clay platelets together and also leads to higher basal plane spacing between them. As a result, the modified platelets are more susceptible to exfoliation when compounded with the polymer matrices. 26 cm. Date : 2009 Disponibilité : Exemplaires disponibles: La bibliothèque des sciences de l'ingénieur (1),
Polymer nanocomposites by emulsion and suspension polymerization   Publication : [S.l.] Royal Society of Chemistry 2010 . 332 p. , Polymer nanocomposites revolutionized research in the composites area by achieving the nanoscale dispersion of the inorganic filler (clay platelets) in the polymer matrices after suitable surface modifications of the filler phase. A large number of polymer matrices were tried and nanocomposites with varying degrees of successes were achieved with these polymer systems. The majority of the synthesis are carried out by melt blending which frequently result in the full exfoliation of the filler. However, advanced techniques provide a number of advantages as compared to the melt blending and lead to more uniform composites with enhanced properties. There are a number of recent advances in these methods such as the use of reactive surfactants, modified initiators, advanced clay surface modifications, use of a variety of fillers, inverse polymerization, and miniemulsion polymerization methods which have further led the generation of advanced exfoliated nanocomposites. Until now, most of the published research has been scattered throughout the literature. This book provides a single comprehensive source of information about one of the most important facets of polymer nanocomposites technology: synthesis in emulsion and suspension. These polymerization methods lead to the generation of the well delaminated polymer nanocomposites with a wide range of polymer matrices. This book serves as both a professional reference for experienced researchers and a valuable text for newcomers to the field. It makes the reader aware of the potential commercial use of these recent developments. 24 cm. Date : 2010 Disponibilité : Exemplaires disponibles: La bibliothèque des Sciences Exactes et Naturelles (1),
Polymer nanotube nanocomposites synthesis, properties, and applications   Publication : [S.l.] : Wiley | Scrivener 2010 . 460 p. , Provides a one-stop source for information on synthesis, properties, and potential applications of nanotube reinforced polymer nanocomposites Research on polymer nanotube composites is a relatively new field, and a lot of development is required to achieve a very large-scale commercial application. Although a number of developments have taken place in terms of the dispersion of nanotubes in the polymer matrices and corresponding improvements in the various physical properties of the composites, a meaningful text on the subject, which can assimilate these advancements in one place to provide an overall potential of the technology, is missing. This edited volume brings together contributions from a variety of senior scientists in the field of polymer nanotube composites technology to shed light on the recent advances in these commercially important areas of polymer technology. The book provides the following features: A summary of recent advances in nanotube composite synthesis technology A basic introduction to polymer nanotube nanocomposite technology for readers who are new to the field Valuable insights for the use of technologies for polymer nanocomposites for commercial application Reviews of current polymer nanotube systems to underscore the high potential of nanotubes as fillers Pathways for large-scale commercial applications ofnanotube nanocomposites. 25 cm. Date : 2010 Disponibilité : Exemplaires disponibles: La bibliothèque des sciences de l'ingénieur (1),
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