15.1 Explain the terms polymer and monomer.
Ans. Polymers are high molecular mass substances consisting of a very large number of simple repeating structural units joined together through covalent bonds in a regular fashion. Polymers are also called macromolecules. Some examples are polythene, nylon-66, bakelite, rubber, etc. Monomers are the. simple and reactive molecules from which the polymers are prepared either by addition or condensation polymerisation. Some examples are ethene, vinyl chloride, acrylonitrile, phenol and formaldehyde etc.
15.2 What are natural and synthetic polymers? Give two examples of each type.
15.3 Distinguish between the terms homopolymer and copolymer and give an example of each.
15.4 How do you explain the functionality of a monomer?
15.5 Define the term polymerisation?
15.6 Is (-NH — CHR—CO-)n a homopolymer or copolymer?
15.7 In which classes, the polymers are classified on the basis of molecular forces?
15.8 How can you differentiate between addition and condensation polymerisatiop?
15.9 Explain the term copolymerisation and give two examples.
15.10 Write the free radical mechanism for the polymerisation of ethene.
15.11 Define thermoplastics and thermo setting polymers with two examples of each
15.12 Write the monomers used for gettingThe following polymers:
15.13 Write the name and structure of one of the common initiators used in free radical addition polymerisation.
15.4 How does the presence of double bonds in rubber molecules influence their structure and reactivity?
15.5 Discuss the main purpose of vulcanisation of rubber.
15.16 What are the monomeric repeating units of Nylon-6 and Nylon 6,6?
15.17 Write the names and structures of the monomers of the following polymers:
15.18 Identify the monomer in the following polymeric structures:
15.19 How is dacron obtained from ethylene glycol and terephthalic acid?
15.20 What is a biodegradable polymer ? Give an example of a biodegradable aliphatic polyester.