ELECTROMAGNETIC SHIELDING EFFECT OF HIGH DENSITY POLYETHYLENE BASED PARTICULATE COMPOSITES

There is a great need for materials with special properties with emergence of new technologies. However, conventional engineering materials are unable to meet this requirement of special properties like high strength, ductility and low density materials for the special purpose applications in the fields of aerospace, automobile,

electromagnetic shielding etc. Thus, emerged new class of engineering materials the composites. Composite material is defined as any multiphase material that is artificially made and exhibits a significant proportion of the properties of the constituent phases. The constituent phases of a composite are usually of macro sized

portions, differ in form and chemical composition and essentially insoluble in each other. In our project we are making polymer composite to study its shielding effect and mechanical properties. Ability of a material to shield Electro Magnetic (EM) radiation depends attributes like volume fraction and conductivity of the materials.

COMPOSITE MATERIALS

Composite materials (or composites for short) are engineered materials made from two or more constituent materials with significantly different physical or chemical properties which remain separate and distinct on a macroscopic level within the finished structure.Composites are made up of individual materials referred to as constituent materials. There are two categories of constituent materials: matrix and reinforcement. At least one portion of each type is required. The matrix material surrounds and supports the reinforcement materials by maintaining their relative positions. The reinforcements impart their special mechanical and physical properties to enhance the matrix properties.A synergism produces material properties unavailable from the individual constituent materials, while the wide variety of matrix and strengthening materials allows the

designer of the product or structure to choose an optimum combination. Engineered composite materials must be formed to shape. The matrix material can be introduced to the reinforcement before or after the reinforcement material is placed.

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