Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are man-made materials made by joining many repeating units called monomers.

They are classified into elastomers, fibers, and plastics based on mechanical properties.

Elastomers, like silicones, are highly flexible materials. When mechanical stress is applied, they can stretch or compress significantly. Once the stress is removed, they return to their original shape.

This elasticity arises from cross-links between polymer chains that help the material to stretch and regain its structure after deformation.

However, fibers, like nylon-66, show high tensile strength and strong resistance to stretching. Their polymer chains have low branching. This allows chains to align in parallel and develop strong attractions between neighboring chains.

Finally, consider plastics. They often contain both crystalline and amorphous regions. The crystalline regions provide strength and structural order, while amorphous regions allow some flexibility.

As temperature increases, crystalline regions lose their ordered arrangement. However, the amorphous regions transition from a rigid, glass-like state to a softer state.