Why are plasticizers added to plastics?

• A. To increase the melting point
• B. To enhance cross linking
• C. To increase flexibility of materials
• D. To increase ductility of materials

Answer: (C)

Plasticizers are substances added to plastics to increase their flexibility, making them more pliable and easier to mold or shape. By incorporating plasticizers, the natural rigidity of the plastic is reduced, allowing the material to become softer and more flexible. This enhanced flexibility is particularly beneficial in applications where the plastic needs to bend or stretch without cracking or breaking.

While increasing ductility may seem similar to flexibility, ductility specifically refers to a material's ability to deform under tensile stress, whereas flexibility pertains to the overall ability of a material to bend without damage. The addition of plasticizers is primarily aimed at achieving that desired flexibility, which is why this choice is the correct answer.