Question

A polymer used in paints is:
A. nomex
B. thiokol
C. saran
D. glyptal

Answer 1

Hint: Polymers are macromolecules or very large molecules which are formed by repeating monomers or condensation of small monomers. Both natural polymers and synthetic polymers play essential roles in several useful needs of day to day life.

<Complete step by step answer: Paints are pigmented liquids which are applied as liquid but become solid on drying. Polymer coating in paints enhances the durability and the decoration of the paint. Primarily four properties of paints are enhanced with the use of polymer coating which are adhesion, wettability, corrosion resistance and wear resistance.
Let us understand the given polymers and their properties one by one.
Nomex: This is an aramid kind of polymer used to prepare heat and flame resistance fibers. This polymer is formed by the condensation of m-phenylene diamine and isophthaloyl chloride. They are rigid and more durable. They are used to prepare fire fighting equipment where a heat resistant is required.
Thiokol: These polymers are polysulfide polymers used as elastomers. They are synthesized from 2-chloroethanol, formaldehyde and sodium polysulphide. They are used as sealants for blocking passage of fluids and also used as binder in solid rocket fuel.
Saran: These polymers are commonly known as plastics. They are made of polythene. They are used for packaging of foods. They prevent food spoilage by maintaining an oxygen barrier. They also help in retaining the flavor of foods.
Glyptal: These are condensation polymers formed by the reaction of ethylene glycol and phthalic acid by release of water molecules. They are step growth polymers formed by the repeating units of ethylene glycol and phthalic acid. The binding property of the resins allows them to produce oil coating in paints.
So option D is correct i.e. glyptal is the polymer used in paints.

Note: Paints are composed of four main components: pigments, binders, liquids and additives. The applied liquids get solidified on drying by evaporation of water molecules. Glyptal enhances the binding property of paints and so are important for making paints.