Polymers

Which statement regarding polymers is not correct?

1. Elastomers have polymer chains held together by weak intermolecular forces
2. Fibers possess high tensile strength
3. Thermoplastic polymers are capable of repeatedly softening and hardening on heating and cooling respectively
4. Thermosetting polymers are reusable

Which among the following is a thermoplastic polymer?

1. Melamine polymer
2. Bakelite
3. Polythene
4. Urea-formaldehyde resin

Which one of the following polymers is prepared by addition polymerisation?

1. Dacron
2. Teflon
3. Nylon-66
4. Novolac

Which of the following is a natural polymer?

1. poly (Butadiene-styrene)
2. polybutadiene
3. poly (Butadiene-acrylonitrile)
4. cis-1,4-polyisoprene

The biodegradable polymer is :

1. nylon-6
2. Buna-S
3. nylon-6, 6
4. nylon-2-nylon 6

Regarding cross-linked or network polymers, which of the following statements is incorrect?

1. They contain covalent bonds between various linear polymer chains.
2. They are formed from bi- and tri-functional monomers.
3. Examples are bakelite and melamine.
4. They contain strong covalent bonds in their polymer chains.

Natural rubber has

1. alternate cis- and trans-configuration
2. random cis- and trans-configuration
3. all cis-configuration
4. all trans-configuration.

Which one of the following structures represents nylon 6, 6 polymer?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Caprolactam is used for the manufacture of

1. teflon
2. terylene
3. nylon 6, 6
4. nylon 6

Biodegradable polymer which can be produced from glycine and aminocaproic acid is

1. buna - N
2. nylon 6, 6
3. nylon 2-nylon 6
4. PHBV