Question

How are polymers classified on the basis of molecular forces?

Answer 1

It has been observed that polymers can be classified on the basis of different intermolecular forces and so there are four types of polymers depending upon the intermolecular force present in them.

• Elastomers are the polymers that can be stretched like elastics and also will come back to their original shape on releasing the force. They have the weakest intermolecular force (Vander Waal force). For example; Neoprene, Buna-S, Buna-N etc.
• Fibers are solids having thread like structure possessing strong intermolecular force. Due to this strong force of attraction, they have high tensile strength. For example: Nylon 66, Dacron, etc.
• Thermoplastic polymers are those polymers which contain intermolecular forces higher than Elastomers but less than Fibers. They are usually linear chain polymers and can be remolded again. Examples: Polythene, Polyvinyl Chlorides, etc.
• Thermosetting plastics are having highly branched chain molecules with extensive cross linking and if heated becomes infusible and cannot be reused. For example: melamine, Bakelite etc.