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2003 Course Polymer Structure-Property Relationships

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Total No. of Questions : 12] P1313 [Total No. of Pages : 3 [3864]-381 B.E. (Polymer) POLYMER STRUCTURE-PROPERTY RELATIONSHIPS (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answers to section-I and section-II should be written on separate answer book. Solve three questions from section-I and three questions from section-II. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Assume suitable data, if necessary. Use of electronic pocket calculator is allowed. SECTION - I Q1) a) Enlist various monomeric ingredients present in final polymer composition [5] which affect polymer properties? Explain any one in brief. b) Polyethylene can not conduct electricity while polyactylene can. Justify.[2] c) Write a short note on Hydrogen as side group in different polymers.[5] d) Why is glass transition temperature (Tg) of polystyrene significantly higher than that of polypropylene? [3] e) What do you understand by Equilibrium and Dynamic flexibility of polymer chains? [3] OR Q2) a) Explain the effect of Fluorine as side group in various polymers. [4] b) Explain the effects of change in flexibility on melting (Tm) and glass transition (Tg) temperatures w.r.t. PE (Tm = 135oC, Tg = 125oC) and PET (Tm = 265oC, Tg = 70oC). [4] c) Enlist the factors those cause polydimethylsiloxane (PDMS) to be one of the most flexible polymer known. [4] d) Explain in brief with examples the effect of various types of Carbon and Oxygen linkages on properties of polymers. [6] P.T.O.

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