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Previous Year Exam Questions of Polymer Technology of bput - PT by Bput Toppers

  • Polymer Technology - PT
  • 2018
  • PYQ
  • Biju Patnaik University of Technology BPUT - BPUT
  • Chemical Engineering
  • B.Tech
  • 5 Offline Downloads
  • Uploaded 11 months ago
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Registration No : Total number of pages : 03 B.Tech. PCE6J003 6th Semester Regular Examination 2017-18 POLYMER TECHNOLOGY BRANCH : CHEM Time : 3 Hours Max Marks : 100 Q.CODE : C417 Answer Part-A which is compulsory and any four from Part-B. The figures in the right-hand margin indicate marks. Assume suitable notations and any missing data wherever necessary. Answer all parts of a question at a place. Q1. (a) (b) (c) (d) (e) (f) Part – A (Answer all the questions) (2 x 10) Answer the following questions : The C-C-C bond angle is i. 103.50 ii. 106.50 iii. 109.50 iv. None of these Number average molecular weights of commercial polymers are usually in the range of i. 100 to 1000 ii. 1000 to 10000 iii. 10000 to 100000 iv. 100000 to 1000000 “Living” polymers are usually obtained by which polymerization mechanism ? i. Cationic ii. Anionic iii. Coordination iv. Ring opening Sodium lauryl sulfate is an example of i. Catalyst ii. Surfactant iii. Lubricant iv. Flame retardant Vapour phase osmometry is used for the measurement of i. ii. iii. iv. None of these In Resol resins, the phenol to aldehyde molar ratio is maintained at i. 1 : 0.8 ii. 1:1 iii. 1 : 1.25 iv. None of these

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(g) (h) (i) (j) Q2. (a) (b) (c) (d) (e) (f) (g) (h) (i) (j) Q3. (a) (b) Q4. The % crystallinityin LDPE is around i. 20 – 30 ii. 30 – 40 iii. 40 – 50 iv. 50 – 60 In general, the strongest polymer group is i. Thermoplastics ii. Thermosets iii. Elastomers iv. All polymers Which of the following is/are thermoplastic polymers ? i. Nylon 6, 6 ii. Bakelite iii. Polystyrene iv. Terylene Which of the following is not an addition polymer ? i. Polyethylene ii. Polypropylene iii. Polystyrene iv. Dacron Answer the following questions : (2 x 10) What are amorphous and crystalline polymers ? Explain with examples. Explain Degree of Polymerization and Functionality. Why the free-radical chain polymerization is an exothermic process? What is Cage effect ? How does the molecular weight distribution in polymers affect the properties of polymers ? What kind of polymer degradation is observed in discoloration of plastic articles when exposed to sunlight ? What is intrinsic viscosity ? Write the properties and applications of HDPE. What is die swell ? Differentiate between isotactic and syndiotactic polymers. Part – B (Answer any four questions) How the chain polymerization steps are brought about by free-radical mechanism ? Discuss in detail. Briefly discuss about the Ziegler-Natta catalyst. Explain in detail the emulsion polymerization technique of manufacturing polymers with suitable diagrams of a micelle and the growth of a polymer chain inside a micelle. Also discuss, a very high molecular weight polymer is obtained by this emulsion polymerization method. (10) (5) (15)

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Q5. Q6. (a) (b) Q7. (a) What do you understand by glass transition temperature ? Discuss this in detail based on the concept of states of aggregates and states of phases. (15) What is polymer degradation ? Briefly explain four different types of polymer degradation. Name five different additives that are used in polymers and mention their function. (10) Viscosity data of solutions of PMMA in chloroform at 200C is given below. (10) Conc. (g/cm3) x 102 0.0224 0.0352 0.0462 0.0868 0.1880 (b) Q8. (a) (b) Q9. (a) (b) Flow time (s) 181 187 193 214 273 (5) r 1.063 1.101 1.133 1.259 1.605 The Mark-Houwink constants for the above system are: K x 102 = 0.48 and a = 0.80. Find out the intrinsic viscosity of the solution. Name the different ways of representing average molecular weights of polymer and the methods to determine them. (5) Discuss the production of polystyrene giving emphasis on the sources of styrene, raw materials, equipments required, reaction conditions, flow diagram, process description, advantages, grades, properties, and uses. Write briefly about the Novolac and Resol resins. (10) Explain the construction and operation of an extrusion molding machine with a neat sketch. Write briefly aboutrotational moldingmachine with a rough sketch. (10) (5) (5)

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