Cochin University of Science and Techology (CUST) 2007-3rd Sem M.Sc Chemistry IN APPLIEDEMBER 2OO7 CHE 2307 POLYMERS OF MODERN MATERIALS - Question Paper

AC.3/07.4(b)

M.Sc. DEGREE III SEMESTER EXAMINATION IN APPLIEDCHEMISTRY, NOVEMBER 2007 CHE 2307 POLYMERS: CHEMISTRY OF MODERN MATERIALS

Time: 3 Hours    Maximum marks : 50

PART - A

(Answer ALL questions)

( All questions carrv EQUAL marks)

'    (5x2=10)

I.    (1) What are photorefractive polymers?

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

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

(4)    Define unperturbed chain dimension and radius of gyration. How are these parameters determined?

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

PART -B

(All questions carry EQUAL marks)

(8x5 = 40)

II.    A. Derive Carothers equation for the linear stotichometric polycondensation. Explain its

significance.

OR

B. Derive the kinetics of free radical polymerization.

III.    A.    Explain the different mechanisms of Zeigler-Natta polymerization.

OR

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

(ii) Write a short note on metallocenes.

IV.    A. Explain Florry-Huggins theory 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 different 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 electrical properties of polymers.

OR

B. Write brief notes on:

(i)    Polymer bound reagents

(ii)    Liquid crystalline polymers

(Turn over)

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 notes 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-37367-1.PDF

Earning:   Approval pending.