Cochin University of Science and Techology (CUST) 2007 M.Sc Chemistry POLYMERS: OF MODERN MATERIALS - Question Paper

AC3/0?.4(b)

M.Sc. DECREE III SEMESTER EXAMINATION IN APPUEDCHEMISTRY. NOVEMBER 2007 CHE 2307 POLYMERS: CHEMISTRY OF MODERN MATERIALS Time: 3 Hours    Maximum murks . SO

PART -A (AnswerQuestions)

(All questions can> EQUAL marks)

AC3/0?.4(b)

(5x2- 10)

I.    (I) W'hat are photorcfractive polymers?

(2)    Atactic polymers arc generally amorphous whereas atactic PVA is crystalline. Explain.

(3)    Why docs a polymer has average M.W rather than a single absolute M. W.? What is PDI?

(4)    Detine unperturbed chain dimension and radius of gyration Mow arc tnesc parameters determined?

(5)    Glass transition is called second order transition. Why?

PA.RT-B (All questions earr> EQUAL marks)

AC3/0?.4(b)

(S x 5 - 40)

II.    A, Derive Carother's equation for the linear stotichometric polycondensation. Explain its

significance.

OR

B Derive the kinetics of free radical polymerisation.

Ml. A. Explain the different mechanisms of Zeigler-Kaiu polymerization

OR

B. (i) What are ehirul polymers? Explain.

(ii) Write a short note on metaiiocenes.

IV. A. F.xplain Florry-Muggins iheorj of polymer solutions.

OR

B. (i) How will you determine the degree of cross*linking?

(ii) How is chain flexibility related to end-to-end distance?

V. A. What are ditYerent thermal characterization methods of polymers? Explain.

OR

B. (i) What is rubber like elasticity?

(ii) Explain Maxwell and Kinetic model of visco elasticity?

VI. A. Discuss the optical and elcctrical properties of polymers.

OR

B Write brief notes on:

(i)    Polymer bound reagents

(ii)    Liquid crystalline polymers

(Turn over)

2

Describe a method for manufacture of PVC Discuss its properties in terms of structure.

OR

Discuss the structures, synthesis and applications of Silicone polymers

Describe the different stages involved in oil refining.

OR

Write brief noies on:

(i)    Polymers derived from natural gas

(ii)    Petrochemicals

Discuss the different classification of polymers.

OR

How will you explain the properties of polymers based on the bonding forces involved?

Attachment: cochin-university-of-science-and-techology--cust--2007-m-sc-chemistry-37374-1.JPG cochin-university-of-science-and-techology--cust--2007-m-sc-chemistry-37374-2.JPG

Earning:   Approval pending.