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2003 Course Polymer Technology (Elective I)

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Total No. of Questions : 12] P1168 [Total No. of Pages : 3 [3664]-279 B.E. (Chemical) POLYMER TECHNOLOGY (Elective - I) (2003 Course) (409341) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section - I and 3 questions from Section - II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Assume suitable data, if necessary. SECTION - I Q1) Classify different polymers based on structure, method of synthesis, Geometry, thermoset and Thermoplastics. Discuss the effect different factors that influences polymer properties. [16] OR Q2) Differentiate the natural polymer and synthetic polymers classify the polymer based on tacticity, (Atactic, Syndiotatic, isotactic). Classify and discuss [16] different polymers based on linear and cross linked polymers. Q3) What are different polymerization techniques are available. Explain different physical aspects which need to consider during selection of technique. Explain in detail suspension polymerization technique along with engineering aspects of suspension polymerization. [16] OR Q4) a) Differentiate addition polymerization and condensation polymerization alongwith suitable example. [6] b) What is difference between suspension polymerization and emulsion polymerization? Explain Smith and Ewart Kinetics used for predicting rate of Emulsion polymerization. Discuss in detail Emulsion polymerization technique and its applications. [10] P.T.O. Q5) What are different methods for determination of molecular wt? Explain vapour phase osmometric method for determination of mol.wt in detail. Write a note on molecular wt control and effect of parameters affecting molecular wt. [18] OR Q6) Explain number average molecular wt ( M n ), Viscosity avg mol. wt( M v ). Explain how dispersity index and degree of polymerization are important for application of polymer. Write a note on Gel Permeation Cromatography for determination of molecular wt of polymers. Explain working principle and role of stationary phase for determination of mol. wt. [18] SECTION - II Q7) Which initiators are used during polymerization process? Explain and derive rate of polymerization (propagation rate) Rp, for free radical polymerization. Write down the different steps such as initiation, propagation and termination during polymerization process? [16] OR Q8) Write a note on : a) Kinetics of step growth polymerization. b) Copolymers and effect of reactivity ratios on copolymerization. c) Coordination polymerization. [8] [4] [4] Q9) What is compounding? Draw and explain extrusion compounding process alongwith different zones present in barrel, screw etc. Explain dry compounding method and equipments used for same. [16] OR Q10)Write a note on : [16] a) Different types of polymer additives, colournats, UV stabilizers. b) Relationship between fillers and mechanical properties. c) Flame retardent additives and its mechanism. d) Injection moulding machine. [3664]-279 2 Q11)Along with process flowsheet explain synthesis process of polypropylene? Explain its application and properties. [18] OR Q12)Write a note on : [18] a) Polystyrene, HIPS and it s properties and application. b) Natural rubber and thermoplastic elastomers. c) Manufacturing of condensation polymer Nylon 6. vvvv [3664]-279 3

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