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Polymer Nanocomposites

Name: Polymer Nanocomposites
Brand: Nova Science Publishers Inc
SKU: 9781608761258
Price: 148.75 EUR
Availability: InStock

Advances in Filler Surface Modification Techniques

Автор: Vikas Mittal

Език:

Корици: С твърди корици

Издател: Nova Science Publishers Inc

Наличност: 50% вероятност

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Polymer nanocomposites revolutionised the research in this field owing to the tremendous improvement...

Информация за книгата

Автор

Vikas Mittal

Език

Английски език

Корици

Книга - С твърди корици

Издадена

2010

страници

216

EAN

9781608761258

ISBN

9781608761258

Enbook ID

06437084

Издател

Nova Science Publishers Inc

Теглоt

624

Размери

183 x 263 x 19

Пълно описание

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.