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Posted By: S.Aruljothi Member Level: Gold Posted Date: 28 Jul 2008
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2007 Anna University B.Tech Plastic and Polymer PM 405 — POLYMER STRUCTURE AND PROPERTY RELATIONSHIP Question paper
PM 405 — POLYMER STRUCTURE AND PROPERTY RELATIONSHIP
Time : Three hours Maximum : 100 marks
Answer ALL questions.
PART A — (10 ? 2 = 20 marks)
1. Distinguish between LDPE and HDPE in terms of their structure of the polymers.
2. What is meant by topological technique? Explain.
3. How will you measure the toughness of a polymer? Give details.
4. What kind of inference can be obtained from fatigue test?
5. Define the terms Tg and Tm.
6. Which type of polymers will give upper and lower glass transition temperatures?
7. How is the additives effect the electrical properties of polymers?
8. Explain the term ‘Gloss’ and ‘Haze’.
9. Which would be the better solvent for polystyrene : (a) n–pentene, (b) benzene (c) acetonitrile? Justify your answer.
10. What are the requirements to get water repellant polymers? Explain with one example.
PART B — (5 ? 16 = 80 marks)
11. Discuss in detail the stress–strain properties of polymers. How these properties can be related to flexural and yield strength of the polymer? (16)
12. (a) (i) Explain the term cross–linking and its effects on the properties of
polymers. (8)
(ii) What are homochain and heterochain polymers? Give example and explain their physical properties. (8)
Or
(b) (i) Discuss in detail about coefficient of linear thermal expansion and volumetric thermal expansion. (8)
(ii) Write an account of pressure volume temperature relationships. (8)
13. (a) (i) What is the relationship between Tg and Tm in amorphous,
semi crystalline and crystalline polymers. Give details. (8)
(ii) How will you predict the Tg and Tm of polymers by group contribution? Explain. (8)
Or
(b) (i) Define the term heat capacity, specific heat and latent heat crystallization and heat of fusion. (8)
(ii) How are heat capacities of polymer calculated? Explain. (8)
14. (a) (i) How is the polymer structure effect on dielectric constant, power
factor and loss factor? Give details. (8)
(ii) Bring out the quantitative relationships of dielectrics with respect to voltage and temperature. (8)
Or
(b) (i) Discuss the prediction of molar polarization and effective dipole
moment in the electrical properties of polymers. (8)
(ii) Write an account of various optical properties of polymers. (8)
15. (a) (i) Give details on polymer solubility and the effect of solvent on them.
(8)
(ii) How will you determine the solubility parameter from heat of vaporization data and from structural formulae? Explain. (8)
Or
(b) (i) How is the structure of polymer influence in prediction of fire retardancy? Explain. (8)
(ii) Write the various toxic effects of polymers. How it can be prevented? (8)
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