Anna University Question papers Polymer Chemistry 2013

 Anna University Question papers Polymer Chemistry 2013

Anna University , Chennai

B. E DEGREE EXAMINATIONS 2011 

(Textile Engineering/ Textile Technology) 

Polymer Chemistry 

Time: 3 Hrs Max. Marks: 100 

Answer all Questions 

PART – A (10 × 2 = 20 Marks) 

1. State the functionality of the monomers, styrene, 
pentaerythritol, glycerol and 1,4–butane diol. 
2. State two important criteria for a polymer to form a fibre. 
3. Compare the molecular weight of polymer and its 
distribution in free radical bulk and solution polymerisation 
techniques. 
4. What is meant by critical miscle concentration? 
5. Explain what is meant by syndiotactic and isotactic 
polystyrene. 
6. What is meant by glass transition temperature? 
7. Why polyacrylonitrile cannot be prepared by bulk
polymerisation? 
8. What are the materials used for the manufacture of PET 
by melt polycondensation? 
9. What is the function of silicone oils when used as a 
compounding material for plastics? 
10. What is the function of UV–stabilisers added to plastics? 

PART B — (5 * 16 = 80 MARKS) 

11. Discuss with suitable examples the classification of 
polymers based on the following heads. 
(i) Source 
(ii) Thermal properties 
(iii) End applications. (16) 
12. (a) (i) Discuss suspension polymerisation technique in 
detail. (12) 
(ii) Compare the advantages and disadvantages of emulsion 
and suspension polymerisation techniques. (4) 
Or 
(b) (i) Compare addition polymerisation and condensation 
polymerisation with suitable examples. (8) 
(ii) Compare the advantages and disadvantages of bulk and 
solution polymerisation techniques. (8) 
13. (a) (i) Discuss the factors affecting crystallinity and 
crystallisability. (10) 
(ii) How does crystallinity affect the properties of polymers? 
(6) 
 Or (b) (i) Explain the various phase transitions of an amorphous 
and a semicrystalline polymer. (8) 
(ii) State with reasons which polymer has higher value in 
each of the following pairs of polymers. 
* Polystyrene or Poly ( –methyl styrene) 
* Poly (methacrylate) or Poly (butylacrylate) 
* Polyethylene terephthalate or Poly (bisphenol–A 
carbonate) 
* Nylon–6 or Nylon–11. (8) 
14. (a) (i) Describe the manufacture of polyurethane foams 
and explain the mechanisms of foam formation when water 
is used as a foaming agent. (10) 
(ii) How is PET manufactured and what is its uses? (6) 
 Or 
(b) (i) Describe the manufacture of polystyrene by bulk and 
emulsion polymerization techniques and state its properties 
and uses. (8) 
(ii) Explain the formation of carbon fibre with suitable 
reactions. (8) 15. (a) (i) State any five compounding materials with 
suitable examples added to plastics and explain their 
function. (10) 
(ii) Explain the technique by which continuous polymer films 
are obtained. (6) 
 Or 
(b) Write notes on any TWO of the following : 
(i) Nylon 6, 6. (8) 
(ii) Weight average molecular weight. (8) 
(iii) Solubility parameter. (8) 

Polymer Chemistry Anna University Previous Semester Question papers 2013