Question

Dacron is polymer of:
A) Glycol and formaldehyde
B) Glycol and phenol
C) Glycol and phthalic acid
D) Glycol and terephthalic acid

Answer 1

Hint: Dacron is also known as polyethylene terephthalate. It is made by repeating a simple compound chain again and again.

Complete Solution :
We know that polymers are materials made of long, repeating chains of molecules. These polymers have unique properties, depending on the type of molecules being bonded and how they are bonded. Some polymers bend and stretch, like rubber and polyester.
- Here dacron is a condensation polymer obtained from ethylene glycol and terephthalic acid. Its properties are: high tensile strength, high resistance to stretching, both wet and dry, and good resistance to degradation by chemical bleaches and to abrasion. It is a condensation polymer because by condensation of ethylene glycol and terephthalic it gives Dacron. Polymerization reaction of Dacron:

There are different uses of Dacron: used as synthetic fibres in clothing, making plastic bottles and may be used for insulation and food packaging. So, the correct answer is “Option D”.

Note: Dacron is a linear polymer that usually contains about 80 units per chain, a solid which can be melted without decomposition. Ester bond is formed in Dacron.