(i)Polyester of glycol and pthalic acid – (b) Glyptal

Polyester means polymers having the ester linkage . So we get to know that glyptal has ester linkage in it.

Now glyptal is a polyester obtained by the condensation of ethylene glycol and pthalic acid. It involves the removal of two simple H₂O molecules.

This is done so to show diagrammatically how the two water molecules are eliminated thereby forming glyptal.

(ii) The Copolymer of 1,3-butadiene and styrene – (c) Buna-S

Buna-S is prepared from two monomers, 1,3-butadiene() and Styrene().

Note:

In the name Buna-S, Bu stands for butadiene, na for sodium which acts as polymerizing agent and S stands for styrene.

(iii) Phenol and formaldehyde resin – (a) Novolac

Novolac is prepared from phenol and formaldehyde. It is thus known as phenol-formaldehyde resin commonly as Bakelite.

Note:

Novolac on heating with formaldehyde(HCHO) undergoes cross-linking to form an infusible mass called bakelite.

(iv) The Polyester of glycol and terepthalic acid – (e) Dacron

Teylene also known as Dacron is prepared by the condensation polymerization reaction of two monomers – Ethylene glycol and Terepthalic acid. Condensation reaction involves the loss of a simple molecule like NH₃, H₂O, HCl, etc(here, H₂O is removed).

(v) Copolymer of 1,3-butadiene and acrylonitrile – (d) Buna-N

Buna-N is obtained by the copolymerization of 1,3-butadiene and acrylonitrile in the presence of a peroxide catalyst.