CHAPTER ONE

INTRODUCTION

Nanocomposites refer to materials consisting of at least two phases with one dispersed in another that is called matrix and forms a three-dimensional network. It can be defined as a multi-phase solid materials where one of the phases has one, two or three dimensions of less than 100 nano metres (nm) or structures having nano-scale repeat distances between the different phases that make up the material(Manias,2007).

Nanocomposites differ from conventional composite materials mechanically due to the exceptional high surface to volume ratio of the reinforcing phase and/or its exceptional high aspect ratio. The reinforcing material can be made up of particles (e.g. minerals), sheets (e.g. exfoliated clay sticks) or fibres (e.g. carbon nanotubes or electro spun fibres). The area of the interface between the matrix and the reinforcement phase(s) is typically an order of magnitude greater than for conventional composite materials.

Polypropylene is isotactic, notch sensitive and brittle under severe conditions of deformation, such as low temperatures or high temperatures. This makes limited its wider range of usage for manufacturing processes. It is a versatile material widely used for automotive components, home appliances, and industrial applications. This is attributed to their high impact strength and toughness when filler is incorporated. 

To meet demanding engineering and structural specifications, PP is rarely used in its original state and is often transformed into composites by the inclusion of fillers or reinforcements. 

Introduction of fillers or reinforcements into PP often alters the crystalline structure and morphology of PP and consequently results in property changes

(Karger-Kosis, 1995).

Polypropylene is an exceedingly versatile polymer, made from a widely available, low cost feedstock in a relatively straightforward and inexpensive process. Polypropylene has good mechanical properties, chemical resistance, accepts fillers and other selected additives very well, and is easy to fabricate by a variety of methods. In addition, it is quite easy to incorporate small amounts of other copolymers, such as ethylene, to yield Polypropylene copolymers with different and commercially desirable properties. Overall, the combination of low cost, ease of fabrication, ability to tailor the resin with co-monomers, and its acceptance of high levels of fillers and other additives make Polypropylene a material of choice in many cost-sensitive application.

However, the levels of fillers and other additives that must be incorporated to achieve the desired properties are difficult or even impossible to incorporate “inline” either in the polymerization process or in the fabrication step. 

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