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2003 Course Polymer Reaction Eng. (Elective I)

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Total No. of Questions : 12] P1398 [Total No. of Pages : 3 [3764]-355 B.E. (Polymer Engg.) POLYMER REACTION ENGINEERING (2003 Course) (Elective - I) (409366) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidate: 1) Answers to the two sections should be written in separate answer books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Assume suitable data, if necessary. 5) Use of logarithmic table, electronic pocket calculators is allowed. SECTION - I Q1) a) Explain the following quantities to be used in the Characterization of Long Chain Molecules: [12] i) Weight Fraction ii) First moment of Pj s iii) Number Average Degree of Polymerization iv) Weight Average Degree of Polymerization v) Number Average Molecular Weight vi) Weight Average Molecular Weight. b) Find the polydispersity Index of the mixture composed of 20 molecules of 1000 monomer lengths and 380 molecules of 1 monomer lengths. [4] OR Explain the distinctive features of Polymerization Reaction Engineering. [8] Q2) a) b) Discuss the distinction between chain polymerization Vs Step Polymerization based on kinetics. [8] Q3) a) Explain with the help of general polymerization reactions the general mechanism for the Free-radical Polymerization. [6] Derive the necessary equation for the total concentration of the free radicals under free radical polymerization. [12] b) P.T.O. 1

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