Clay-Containing Polymeric Nanocomposites Volume 1 by L. A. Utracki PDF

By L. A. Utracki

This can be half 1 of a two-part set. half 2 ISBN is 1859574823

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Extra info for Clay-Containing Polymeric Nanocomposites Volume 1

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9 negative charges per unit cell and a commensurate number of exchangeable cations in the interlamellar galleries. The amount of this high aspect ratio nanomaterial that needs to be added to a polymeric matrix to engender CPNC with improved performance can be as little as 5 ppm. The aim is to totally exfoliate the platelets, but frequently doublets and short stacks (tactoids) may also be present. Considering the importance of MMT a more detailed description of its structure and properties is given below.

Variability of CPNC has frequently been blamed on structural (particle size distribution and aspect ratio) as well as chemical (surface reactivity) variability. Consequently, there is a growing interest in synthetic or at least semi-synthetic layered materials with well-controlled physical and chemical properties. While experiments with these model systems are essential for development of a basic knowledge of intercalation and exfoliation, the hope is that the technology can be developed to produce synthetic layered materials on a large-scale for the manufacture of CPNC with consistent performance characteristics.

CPNC usually contains low clay concentration, which results in increased melt viscosity, significant improvement of barrier properties, reduction of flammability, improved optical properties and increased rigidity. Thermodynamic and flow properties and the diverse effects of nanoparticles on the nucleation and crystallinity of polymeric matrices are discussed later in this book. For example, it has been reported that the impact strength of crystalline polymer is reduced by incorporation of nanoparticles.

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