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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 Q4) a) b) OR Define the term Instantaneous Fractional Degree of Polymerization and derive the necessary equation for the Instantaneous Fractional Degree of Polymerization for carrying out Free-radical Polymerization in perfectly mixed batch reactor. [14] Discuss in brief the rate of Initiation in terms of Initiator concentration.[4] Q5) Discuss the model to account for effect of diffusion on rate constant in step growth polymerization. [16] OR Q6) Discuss the model to find the rate of polymerization in case of emulsion polymerization. [16] Q7) a) SECTION - II Draw process flow sheet for the production of PET and explain the process in detail. [8] b) Differentiate between the different polymerization techniques for manufacturing PVC. [10] OR Q8) Give the technological review over the manufacturing process of following polymers. [18] a) SBR b) Polystyrene c) Nylon 6 Q9) a) b) Find the percentage conversion and the number average molecular weight of Styrene which is to be polymerized at 80oC with Free radical Polymerization in a batch reactor for a reaction time of 3 hours. The initial concentration of monomer is 8.135 gmole/lit, and the concentration of initiator is kept constant at 0.06 gmole/lit. Assume termination takes place only by combination. The rate constant are as k0 = 3*10 6 sec 1, kp = 176 lit/gmole.sec, kc = 3.6*107 lit/gmole. sec, f = 0.6. [12] Write a note on gel effect in free radical polymerization. [4] Q10)a) OR Discuss the conclusion from kinetics studies in free radical polymerization. [8] b) Discuss the MWD and reactor choice in polymerization process. [8] [3764]-355 2 -2- Q11)a) b) Q12)a) b) Write short note on choice of phase. Discuss about the safety of polymerization reactor. [8] OR What are common control problems that can occur in polymerization reactor? [8] Explain the role of controls in batch polymerization process. [3764]-355 3 [8] -3- [8]

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