Pune University BE Polymer Engineering Polymer Reaction Engineering Question Papers

Pune University BE Polymer Engineering Polymer Reaction Engineering

Question Papers

B.E. (Polymer) POLYMER REACTION ENGINEERING (2008 Pattern) (Sem. – I) (Elective – I)

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.


Q1) a) Explain the distinctive features of Polymerization Reaction Engineering.


b) Explain the role of residence time distribution and the concentration history in Polymerization reaction.                                                                                    [8]


Q2) 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)            Explain the role of change in viscosity in Polymer reaction Engineering.


Q3) a) Discuss all the mechanism steps to be used in Free radical polymerization with one suitable example.                                                                                                               [6]

b)            Derive the necessary equation of the rate of Initiation (ri) in terms of Initiator concentration [I].                                                                                                [6]

c)            Discuss and Derive the necessary relationship giving the effect of Perfectly Mixed Flow Reactor on Instantaneous Number Degree of Polymerization for carrying out Free-radical Polymerization. [6]


Q4) a) Derive the necessary expression for Instantaneous Fractional Degree of Polymerization and Instantaneous weight Degree of Polymerization by using Ionic polymerization.        [12]

b) Discuss in detail all technical conclusions from Free Radical Kinetics Studies.   [6]

Q5) a) Discuss the advantages of Emulsion polymerization and give at least four polymer names to be produced via emulsion techniques. Explain the role of Critical Micelles Concentration in Emulsion Polymerization techniques.                                                     [12]

b) Write a note on Aqueous Emulsifier Solutions.                                                 [4]


Q6) Describe the Three Stages of Emulsion Polymerization needed to understand the kinetics. Discuss kinetics of Emulsion polymerization and give at least two polymer names to be produced via emulsion techniques.                                                                        [16]


Q7) a) Draw process flow sheet for the production of PET and explain the process in detail.      [9]

b) Describe in detail VK Tube Reactor for the synthesis of Nylon6. [9]




Q8) Describe with neat process sheet the reactor systems used for PVC, HDPE polymers.          [18]

Q9) a) Write a note on gel effect in step growth polymerization.              [8]

b) Discuss the effect of reaction conditions on the viscosity build up in free radical polymerization.                                                                                         [8]


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 reaction.          [8]

b) Explain the reactor design in terms of following factors Polymerization Mechanism, Stoichiometric Factors, Thermodynamics Factors, and Transport Limitations.           [8]


Q12)a) Write in detail about the process control strategies in Continuous polymerization process.                                                                                                             [8]

b)            Discuss the choice between batch and continuous reactor for polymerization process.                                                                                                                               [8]

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