Question

What is the functions of fillers and plastisizers in the compounding of plastic?

Answer 1

1.FILLERS (or EXTENDERS).

Fillers are added to a base polymer to lower the manufacturing cast of a product made from it. Functions of fillers are as follows:

•  Reducing the cost of plastic.
•  Increases the tensile strength and hardness.
•  Reduces the flexiblity.
•  Decreases the shrinkage during moulding.
•  Gives opacity to the product.
•  Examples:-mica, talc, asbestos , saw dust ,chalk etc.

2. PLASTICIZERS.
The Plasticizer molecule occupies between the polymeric chains and neutralizes the intermolecular forces of attraction and thus allows freedom of movement. The functions of plasticizers are as follows:-

•  Increases the plasticity of the plastics.
•  Lowers the softening temperature and hence moulding and remoulding can be done at low temperature.
• Imparts flames proofness.
• Reduces resistance towards chemical, solvents etc.
• Examples:- esters of fatty acids, vegetables oils etc.