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Of the following which one is classified as polyester polymer?
A
Nylon-66
B
Terylene
C
Bakelite
D
Melamine
Detailed Solution
A polyester is a condensation polymer in which the monomer units are joined by ester (–COO–) linkages.
Terylene (dacron) is made by condensation of ethylene glycol ($HOCH_2CH_2OH$) with terephthalic acid ($HOOC-C_6H_4-COOH$) at 420–460 K, so it contains ester linkages and is a polyester.
Nylon-6,6 is a polyamide (from hexamethylenediamine and adipic acid).
Bakelite is a phenol–formaldehyde resin and melamine polymer is a melamine–formaldehyde resin.
Hence the polyester is terylene.
Terylene (dacron) is made by condensation of ethylene glycol ($HOCH_2CH_2OH$) with terephthalic acid ($HOOC-C_6H_4-COOH$) at 420–460 K, so it contains ester linkages and is a polyester.
Nylon-6,6 is a polyamide (from hexamethylenediamine and adipic acid).
Bakelite is a phenol–formaldehyde resin and melamine polymer is a melamine–formaldehyde resin.
Hence the polyester is terylene.