POLYMER

They are materials that consist of repeated chemical units (`mers') joined together, like beads on a string. Some polymer molecules contain hundreds or thousands of monomers and are often called macromolecules.

Polymers may be natural, such as leather, rubber, cellulose or DNA, or synthetic, such as nylon or polyethylene.

Many of important current research problems and technological applications involve polymers. Living organisms are mainly composed of polymerized amino acids (proteins) nucleic acids (RNA and DNA), and other biopolymers. The most powerful computers - our brain - is also a rigid,complex and sound polymeric material..