Bibliothèque de L'IMIST/CNRST

Votre panier est vide.
IMIST


Votre recherche a retourné 4 résultats.

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),

Réserver Ajouter au panier
Pas d'image disponible
Nano- and biocomposites par Lau, Alan Kin-tak Publication : Boca Raton CRC Press 2010 . 390 p. , Advanced polymer-based nanocomposite materials continue to become increasingly popular and important for a wide range of engineering applications, as evidenced by continued government initiatives involving R&D and commercialization of these substances. In the race to exploit the unique mechanical, thermal, and electrical properties of nanocomposite materials, researchers must also address new challenges to predict, understand, and manage the potentially adverse effects they could have on human lives and the environment. Nano- and Biocomposites focuses on the structural makeup of nanomaterials and their range of applications. It details the latest research in which biological applications of nanostructural resins have been conducted within in vitro and in vivo environments. Some of the applications explored in this book include: Tissue engineering and growth Mechanical and thermal stability enhancement of biocompatible polymers for artificial joints and scaffolding Thermal management for directed energy weapons, deicing, and electronics Structural performance for primary and secondary airframe structures, jet engines Electrical conductivity for lightning-strike protection, EMI, ESD, and energy storage Durability for chemical, wear, flame retardance, permeability Health monitoring for NDE certification, damage detection, and long-term degradation This compilation of author contributions is divided into two sections— Nanostructured Polymer Composites and Nano-Bio Composites . It provides a basic understanding of nanomaterial and nanocomposite research to explain the fundamentals of how nanostructured fillers strengthen polymer-based materials. With an emphasis on how nano- and biocomposites are used to create new biomedical applications, the text also focuses on the crucial yet often-ignored potential toxicity impact of using nanostructured materials. It presents important guidelines and new insights to stimulate investigation of anticipated research in this fascinating new field. Researchers, scientists, and academics will appreciate this cutting-edge exploration of nanomaterials, biomaterials, and the ever-evolving world of nano-biomaterials. 24 cm. Date : 2010 Disponibilité : Exemplaires disponibles: La bibliothèque des sciences de l'ingénieur (1),

Réserver Ajouter au panier
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),

Réserver Ajouter au panier
Vous ne trouvez pas ce que vous cherchez ?
© Tous droits résérvés IMIST/CNRST
Angle Av. Allal Al Fassi et Av. des FAR, Hay Ryad, BP 8027, 10102 Rabat, Maroc
Tél:(+212) 05 37.56.98.00
CNRST / IMIST

Propulsé par Koha