Download GTU BE/B.Tech 2018 Winter 6th Sem New 2162304 Polymer Reaction Engineering And Rheology Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VI (NEW) EXAMINATION - WINTER 2018

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Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Give difference between elementary and nonelementary reactions. 03

(b) Discuss working of Batch reactor. Give its advantages and limitations. 04

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(c) Define: Rheology. Classify non-Newtonian fluids and give time-dependent fluids, time independent fluids with suitable examples. 07

Q.2 (a) Explain die swell and melt fracture effect in polymer melt flow. 03

(b) Explain Voigt model for viscoelasticity. 04

(c) Discuss working of Torque rheometer with diagram. 07

OR

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(c) Classify chemical reactions and explain with suitable examples. 07

Q.3 (a) Polymer has a glass transition temperature of 0 °C, at 50 °C; it has a melt viscosity of 2.69x10⁶ poises (P). What will its viscosity be at 70 °C? 03

(b) Discuss WLF equation. 04

(c) Explain kinetics studies of Free-radical polymerization. 07

OR

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Q.3 (a) Explain Maxwell model for viscoelastic materials. 03

(b) Explain flow analysis-using Power law. 04

(c) Discuss: Free volume Theory 07

Q.4 (a) Explain working of Continuous stirred tank reactor (CSTR) along with its advantages. 03

(b) Explain the creep curve for plastic materials. 04

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(c) Explain temperature dependency from Arrhenius law. 07

OR

Q.4 (a) The following are data for polymerisation of styrene in benzene at 60°C with benzoyl peroxide as the initiator. If the spontaneous decomposition rate of benzoyl peroxide is 3.2 x 10^-6 m³/mol sec^-1. Calculate of rate of propagation for free radical polymerisation. [M]=3.34 x10^-3 mol/m³, [I] = 4.0 mol/m³, f=1, k_p² / k_t = 0.95 x 10^-6 m³/mol sec. 03

(b) How molecular weight and molecular weight distribution affect polymer viscosity? Discuss. 04

(c) What is Weissenberg effect? Discuss. 07

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Q.5 (a) The rate constants of a certain reaction are 1.6 x10^-2 & 1.625x10^-2 (s)^-1 at 10°C & 30°C. Calculate the activation energy. 03

(b) (i) Effect of Shear Rate on Viscosity. 04

(c) With neat diagram explain Cone and plate viscometer for polymer melt. 07

OR

Q.5 (a) What are the advantages and limitations of Semi batch reactor? 03

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(b) Explain kinetics studies of Cationic polymerization. 04

(c) Write a note on: Boltzman superposition principle. 07

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