Definitions of Polymer

A polymer is a chemical substance whose molecules are large and consist of many small repeating units covalently bonded together. In nature, a wide variety of polymers, the biopolymers, are synthesized by living organisms. Among such biopolymers are the proteins which perform many different functions, such as acting as catalysts or regulators. For example, the polysaccharides - important in structures and as energy reserves - and the nucleic acids which carry genetic information from one generation to the next.

In addition, rubber, a plant polymer, is an industrially important elastomer, while little direct commercial use has yet been found for lignin, another abundant plant polymer. The microbial polyesters, polyhydroxyalkanoates, are, in contrast, growing in importance as biodegradable plastics made from renewable resources.

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