Polymers and Plastics

Polymers are large molecules made by linking many smaller units, called monomers, into long chains or networks. Some polymers occur naturally, including cellulose in plants, starch, natural rubber and the proteins found in living organisms. Others are produced by chemical processes and are known as synthetic polymers.

Plastics are a broad family of materials made mainly from synthetic or modified polymers, although additives are often included to improve flexibility, strength, color or resistance to heat. Because polymers can be lightweight, durable and easy to shape, they are used in packaging, clothing, medical equipment, electronics, vehicles and countless everyday products.

Different polymers have different properties, so no single plastic is suitable for every application. Plastics have transformed modern life, but their production, use and disposal also present environmental challenges. Many common plastics degrade very slowly in nature, and discarded waste can accumulate on land and in oceans if it is not properly managed.

Recycling helps recover valuable materials, although not every type of plastic can be recycled easily or repeatedly. Scientists are developing new polymers that are easier to recycle, contain renewable raw materials or can break down more readily under specific conditions. Reducing unnecessary plastic use, reusing products when possible and improving waste collection all help limit pollution. Understanding polymers allows engineers and researchers to design safer, more efficient and more sustainable materials for the future.