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Which among the following polymers is chemically least reactive and thermally most stable?
Teflon is chemically unreactive and thermally stable.
Caprolactum is obtained by Beckmann rearrangement of
Caprolactum is obtained by Beckmann rearrangement of cyclohexanone oxime.
The polymers made by addition polymerisation from two different monomers are termed as copolymers.
Which of the following is used in paints?
Glyptal is a polymer which is used in the manufacture of paints and lacquers.
What percentage of sulphur is used in the vulcanisation of rubber?
Natural rubber becomes soft at high temperatures (> 335 K) and brittle at low temperatures (< 283 K), and shows high water absorption capacity. On vulcanisation, sulphur forms cross links at the reactive sites of double bonds and thus, the rubber gets stiffened. In the manufacture of tyre rubber, 5% of sulphur is used as a cross-linking agent.
How can number average molecular mass () and weight average molecular mass () of synthetic fibres be related?
Which of the following is a biodegradable polymer of polyester class?
PHBV is biodegradable and contains ester linkages.
The outer capsule of drugs is made up of a polymer of
3-hydroxybutanoic acid and 3-hydroxypentanoic acid, on copolymerisation, form PHBV polymer which is a biodegradable polymer and is used in speciality packaging, orthopaedic devices and for the controlled release of drugs.
The polymer which is used in army weapons is
The polymer which is used in army weapons is urea-formaldehyde resin.
The polymer used for making contact lenses for eyes is polymethylmethacrylate.
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