Natural rubber is not used in making footwear for polar regions because
natural rubber becomes soft at temperature lower than 10oC
natural rubber becomes brittle at temperature lower than 10oC.
natural rubber melts at temperature lower than 10oC.
natural rubber becomes stronger at temperature lower than 10oC.
Which of the following structures represents neoprene polymer?
When condensation product of hexamethylenediamine and adipic acid is heated to 553 K (80o) in an atmosphere of nitrogen for about 4-5 h, the product obtained is
solid polymer of nylon - 66
liquid polymer of nylon- 66
gaseous polymer of nylon-66
liquid polymer of nylon - 6
Neoprene is
a monomer of rubber
synthetic rubber
natural rubber
vulcanised rubber
For the formation of terylene, the number of moles of ethylene glycol required per mole of terephthalic acid is
1
3
2
4
Polyethylene is a resin obtained by polymerization of
styrene
isoprene
ethylene
butadiene
Which of the following is a chain growth polymer?
Starch
Nucleic acid
Polystyrene
Protein
Which of the following is a biodegradable polymer?
Cellulose
Polythene
Polyvinyl chloride
Nylon - 6
Teflon is a polymer of
Vinyl chloride
tetrachloro ethylene
tetrafluro ethylene
buta - 1,3- diene
Which of the following is not a synthetic rubber?
Neoprene
SBR
Thiokol
Orlon
