Polymers questions | form six Chemistry

Briefly, explain the following and give one example for each:
(i) Thermoplastic polymers
(ii) Thermosetting polymers
(iii) Natural polymers

Write the monomers used in synthesis of the following polymers:
(i) Polyvinylchloride (PVC)
(ii) Teflon
(iii) Bakelite

1. Why cationic polymerization is more favored than anionic polymerization when vinylic monomers contain an electron donating group?
2. Why styrene undergo anionic polymerization easily? Briefly explain.
3. Differentiate addition from condensation polymers basing on the mode of polymerization. Give one example for each type.

With reasons, write down the use of each of the following polymers:
(i) Butyl-rubber
(ii) Polyacrylonitriles
(iii) Polyhaloalkene

Show the initiation step and propagation step fo the following polymerization types for Polytetrafluoroethene (PTFE) polymer:

1. Free radical polymerization
2. Cationic polymerization
3. Anionic polymerization

Give the IUPAC names of monomers in the following polymers;

1. Semi aromatic polyamide

2. Neoprene (oil resistant elastomer)

3. Saran (packaging film)

4. Oil soluble polymer

Alanine(A), Glycine(G) and Valine(V) with the following structures are among the natural amino acids for protein synthesis.

1. Identify the functional groups in those amino acids.
2. Show how polymerization of those monomers can be done.
3. Provide the common name of the resulting polymer in (ii)
4. Write the minor product common to all in (ii)
5. What name is given to the bond combining the three amino acids?

Arrange the following compounds in the order of decreasing basic strength: , , , and

1. Give the strutural formulae of hexane-1,6-dioic and 1,6-diaminohexane.
2. Explain why the pair of molecules in (i) is suitable for polymerization.
3. Give the structure of the polymer which might be formed by the pair of molecules in (i).
4. Show the repeating unit of the polymer formed by this pair of compounds.

Indicate the monomer and the polymerization method which are likely to be used in making each of the following commercial polymers: