Model Question Paper Mahatma Gandhi University V Semester B. Tech. Degree Examination Branch: Polymer Engineering PO 010 502 Plastics- Science & Technology Time: 3 hours
Maximum: 100 Marks Part A Answer all questions Each question carries 3 marks
1. 2. 3. 4. 5.
How crosslinked polyethylene is made? Why stabilizers are important in PVC compounding? Name one stabilizer. Write notes on PVF Nylons exhibit high melting point. Why? Differentiate between thermoplastics and thermosets. Give two examples for each. (5x3=15) Part B Answer all questions Each question carries 5 marks
6. 7. 8. 9. 10.
Why polypropylene is more susceptible to oxidation than polyethylene? Compare the structure and properties of PMMA and PAN. What is Teflon? Why it exhibit high thermal stability? What is ring opening polymerization? Illustrate the mechanism with an example. Differentiate between resol and novolac (5x5=25) Part C Answer all questions Each question carries 12 marks
11.What are the raw materials for the preparation of styrene? How is styrene polymerized by the mass polymerization method? OR 12. How is HDPE prepared industrially ? discuss briefly the various processes 13. Describe the suspension process for manufacturing polyvinyl chloride. OR 14. Compare the structure of PVC with that of polythene and explain how the structure is related to its properties. What are the important fields of application of PVC. 15. What are polyesters? How many kinds of polyesters are there? Write briefly, how polyesters are produced, in general. OR 16. Discuss briefly on PU 17. How is nylon 6 prepared industrially? What are its important properties? OR 18.What are the raw materials for nylon 6? How nylon 6 is prepared? 19. Explain the reaction between phenol and formaldehyde and process of forming PF resins? OR 20. How UF resin is prepared? Mention the important properties and uses of UF resins
Model Question Paper Mahatma Gandhi University V Semester B. Tech. Degree Examination Branch: Polymer Engineering PO 010 506 Rubbers- Science & Technology Time: 3 hours
Maximum: 100 Marks Part A Answer all questions Each question carries 3 marks
1. 2. 3. 4. 5.
Natural rubber shows high gum vulcanisate strength and high green strength. Why? What is vulcanization? Mention the physical and chemical changes accompanying vulcanization. Based on the structure, explain the high air impermeability of butyl rubber. Which rubber is suited for making oil seals? How the oil resistance varies with its composition? Why block copolymer TPEs show the properties of reinforced vulcanized elastomer? (5x3=15) Part B Answer all questions Each question carries 5 marks
6. 7. 8. 9.
Write short note on preparation and advantages of powdered rubber. Explain the mechanism of sulphur vulcanization What are the monomers of SBR? Mention any one method for their preparation. What is the significance of dienes in ethylene propylene rubber? What are the requirements of dienes? Give two examples. 10. Write notes on nitrosofluoro elastomers. (5x5=25) Part C Answer all questions Each question carries 12 marks 11(a). What are technically specified grades of NR? What are the technical specifications? Explain the production of crumb rubber. (2+3+7) OR (b). Write notes on (i) SP rubber (ii). DPNR (iii). Liquid NR 12(a). Explain the various continuous vulcanization techniques OR (b). Write notes on (i) different sulphur vulcanization systems (ii) vulcanization by microwave and radiation 13(a). Write in detail the monomer preparation and polymerization process for the manufacture of polybutadiene. OR (b) Write notes on (i) halogenation of butyl rubber (ii) compare and contrast the properties of NR and IR 14(a) Write an essay on the monomer preparation, polymerization and properties and applications of chloroprene rubber OR
(b) Write the structure, properties and vulcanizing agent for the following rubbers: (i) NBR (ii) silicone rubber (iii) EP rubber 15(a). Write the structure, properties and applications of (i) chlorosulphonated polymer (ii) acrylic rubber (iii) polysulphide rubber OR (b) Write notes on (i) fluorine containing rubbers (ii) TPEs (12x5=60)
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