Which of the following polymers are obtained by condensation polymerization?

A. Terylene

B. Poly ethene

C. Teflon

D. Nylon 6,6

Choose the correct answer from the options given below:

A and D only

D) Nylon 6,6: It is prepared by the condensation polymerization of hexamethylenediamine with adipic acid under high pressure and at high temperature.

 + nH₂O

Nylon 6,6 is fiber forming solid. It possesses high tensile strength. This characteristic can be attributed to the strong intermolecular forces like hydrogen bonding. These strong forces also lead to close packing of chains and thus impart crystalline nature. Nylon 6, 6 is used in making sheets, bristles for brushes and in textile industry.

Polyesters (A-Terylene): These are the polycondensation products of dicarboxylic acids and diols. Dacron or terylene is the best-known example of polyesters. It is manufactured by heating a mixture of ethylene glycol and terephthalic acid at 420 to 460 K in the presence of zinc acetate-antimony trioxide catalyst as per the reaction given earlier. Dacron fibre (terylene) is crease resistant and is used in blending with cotton and wool fibres and also as glass reinforcing materials in safety helmets, etc.