Download GTU BE/B.Tech 2018 Winter 7th Sem New 21726022172607 Polymer Kinetics Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
E - SEMESTER-VII (NEW) EXAMINATION — WINTER 2018
Subject Code: 2172602/2172607 Date: 19/11/2018
Subject Name: Polymer Kinetics

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Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

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1. 1. The rate constants for a certain reaction are 1.6*10⁷ and 1.625*10⁷ (second)^-1 at 10°C and 30°C respectively. Calculate the activation energy. 03
   2. Compare collision theory to transition state theory. 04
   3. The primary reaction occurring in the homogeneous decomposition of nitrous oxide is found to be N₂O—N₂+1/2O₂, with a rate -r_N2O= k₁*[N₂O]/1+k₂*[N₂O].Devise a mechanism to explain this observed rate. 07

2. OR

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   1. Give classification of reactors based on it’s thermal behavior. 03
   2. Differentiate integral method of analysis and differential method of analysis. 04
   3. Derive integral rate expression for second order irreversible bimolecular reaction A+B?P for variable volume system. 07
3. 1. The decomposition of NH₃ on tungsten wire at 856°C yield the following result:
      

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      Total Pressure,(Torr) 228 250 273 318
      Time(s) 200 400 600 1000
      Determine the order of reaction and calculate value of the rate constant. 07
   2. Write a brief note on term ‘molecularity’ 03
   3. With the suitable examples, explain the term space time and space velocity respectively. 04

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4. OR

   1. Assuming a stoichiometry A?R for first order gas reaction, we calculate the size of plug flow reactor needed for given duty (99%conversion of pure feed) to be V=32 liters. Infact, however, the reactions stoichoimetry is A?3R with this corrected stoichiometry, what is the required reactor volume? 07
   2. Write a brief note on order of reaction. 03
   3. Consider a gaseous feed C_A0=100, C_B0=200 to a steady flow reactor operated at constant temperature and pressure. The isothermal gas phase reaction taking place is A+B?R+S. For X_A=0.8, find C_A, C_B, and X_B. 04

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5. 1. The homogeneous gas phase decomposition of phosphine proceeds at 649°C, 4PH₃? P₄ +6H₂ with the first order rate r _PH3=(10/hr)*C _PH3.What size of plug flow reactor for operating at 649°C and 4.6 atmosphere can produce 80% conversion of feed consisting of 2 kgmoles of pure phosphine per hour? 07
   2. Write down the practical significance of chain modifier with suitable rubber reaction chemistry. 03
   3. Explain the kinetics of non-catalyzed polycondensation reaction. 04

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6. OR

   1. Discuss the kinetics of cationic polymerization. 07
   2. With reaction chemistry explain the term ‘telomerization’. 03
   3. Explain the kinetics of catalyzed polycondensation reaction. 04

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7. 1. Discuss the kinetics of anionic polymerization. 07
   2. Explain the principle of membrane osmometry method to determine the polymer molecular weight. 03
   3. Write about the methods used to determine the reactivity ratio. 04

8. OR

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   1. The following data were obtained on the osmotic pressure of solution of B-globulin in 0.1SMNacl a1 37°C
      C, grammole/100ml 19.27 12.53 5.81
      p, mmH₂O 453 253 112
      Calculate the polymer weight of polymer. -
   2. Write down the full form of USLV. Also give it’s major advantages. 03

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   3. Write in brief about the effect of reactivity ratio on copolymerization behavior. 04
9. 1. Calculate the intrinsic viscosity of polystyrene sample in toluene from the following relative viscosity data obtained at 25°C.
      C*10³Kgmole/m³ 0.002 0.004 0.006 0.008 0.010
      ?_r 1.102 1.208 1.317 1.430 1.548
      

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      Calculate M if the Mark Houwink constants are a=0.69 and K=1.7*10^-5m³/Kgmole

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