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2003 Course Polymer Reaction Eng. (Elective I)

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Total No. of Questions : 12] P1014 [Total No. of Pages : 3 [3664]-297 B.E. (Polymer) POLYMER REACTION ENGINEERING (2003 Course) (Elective - I) (409366) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate books. 2) Draw neat diagrams wherever necessary. 3) Numbers 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) Discuss the various parameters that affect the properties of any polymeric material. [6] b) Explain the role of change in viscosity in Polymer reaction Engineering. [4] c) Polymer A is made up of the following distribution of the chain molecules. Find the number average molecular weight, weight average molecular weight and polydispersity Index. [6] Data: Weight (in gms) Molecular weight 5 10,000 10 50,000 10 1,00,000 OR Q2) a) Discuss the role of heat transfer in polymerization process. [4] b) From the analysis of the given mixture which is composed of 10 molecules of 10,000 monomer lengths and 100 molecules of 10 monomer lengths find the Dispersion Index of the sample. [4] c) Define at least four quantities used for the characterization of polymers. [8] P.T.O. Q3) a) Derive the necessary equation of the rate of Initiation (ri) in terms of Initiator concentration [I]. [6] b) Derive the necessary equation of the total concentration of the free radicals o (Rj) in terms of the rate of Initiation (ri) under free radical polymerization. [12] OR Q4) a) MMA is to be polymerized at 80 C with Free radical Polymerization in a batch reactor. 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 Find the number average molecular weight, weight average molecular weight and MWD for a reaction time of 200 min. [12] b) Derive the necessary design equation of Batch Reactor on Instantaneous Number Degree of Polymerization for carrying out Free-radical Polymerization. [6] Q5) a) Discuss the necessary equation for the steady state population balance equation for the particles having n radicals in the Emulsion polymerization. [10] b) Write a note on Aqueous Emulsifier solution. [6] OR Q6) Derive the necessary equation of Overall rate of polymerization in emulsion Polymerization if Case 1) Number of the Free radicals per polymer particles small compared with unity. Case 2) No transfer of polymer radicals out of the particle through diffusion and high rate of termination. [16] [3664]-297 -2- SECTION - II Q7) a) Describe in detail the synthesis of Polyvinylchloride via suspension polymerization technique. [8] b) Discuss Liquid Flow Reactor and Recirculated Coil Reactor for the synthesis of Polystyrene. [10] OR Q8) With applicable Flow sheet explain in detail about the manufacturing of the followings: [18] a) High Impact Polystyrene (HIPS) b) Nylon 66 Q9) a) Discuss the Auto acceleration effect in Free radical Polymerization and explain its role in Kinetics of vinyl chloride polymerization. [8] b) Discuss in detail Kinetics of step growth polymerization. [8] OR Q10) Discuss in detail the Chiu s Model to explain the effect of diffusion at high conversion on the rate constant in Step Growth polymerization. [16] Q11) a) Write a short note on Reactor Selection for carrying out polymerization [10] reaction. b) Explain with neat diagram the effect of different polymerization process variables on end-use properties. [6] OR Q12) a) Write in detail about the process control strategies in Continuous polymerization process. [8] b) Explain the reactor design in terms of following factors Polymerization Mechanism, Stoichiometric Factors, Thermodynamics Factors, and Transport Limitations. [8] [3664]-297 -3-

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