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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. Q3) a) Comment on the effect of chemical groups on the adhesive properties of polymer. Explain with suitable examples. [6] b) Explain how tacticity affects the properties of polypropylene. [4] c) The morphology of polymeric product gets affected by processing conditions. True or False. Justify. [6] OR Q4) a) With a suitable example of thermoplastic polymer explain the effect of its structure on mechanical, chemical, thermal, optical and electrical properties. [10] b) Can processing conditions alter the crystallinity in the processed product? Explain with suitable examples. [6] Q5) a) What are different additives used in polymer compound? Explain the role of additive in modifying polymer properties with proper examples.[8] b) Write a short note on Conducting Polymers. [4] c) Comment on the choices of different molecular weight grades while processing by injection moulding and extrusion techniques. [4] OR Q6) a) Explain with suitable examples how molecular weight and molecular weight distribution affect polymer properties. [6] b) What decides the polarity of bond? Explain how does polarity affects electrical properties of polymer? [4] c) What are plasticizers? With suitable example, explain how plasticizer affects processing as well as properties of polymer? [6] SECTION - II Q7) a) Explain with examples the role of freedom of rotation of bonds required for molecular flexibility. [6] b) What makes elastomers flexible? [3] c) Explain what is supercooled state and its significance towards rate of crystallization. [6] d) Why Nylon 612 has less modulus than Nylon 66 but still is expensive?[3] OR [3864]-381 2 Q8) a) Write short note on Liquid Crystalline Polymers. b) Explain effect of reheating on crystallization. [6] [4] c) Explain what is meant by intermolecular order? Also, explain 1st and 2nd order transition. [4] d) Explain how polystyrene and PVC can be made flexible. Q9) a) Explain the kinetic factors affecting crystallization. [4] [5] b) Give the effect of crystallization on any five polymer properties. [5] c) Explain how to determine percent crystallinity in the polymer? [6] OR Q10) a) Explain what is orientation? Compare the effect of uniaxial and biaxial orientations on polymer properties. What kind of orientation is obtained in injection and blow moulded products. [7] b) State the reasons for not getting complete (100%) crystallinity in polymers. [3] c) Processwise how can one differentiate between orientation and crystallization[3] d) State the structural requirements which facilitate crystallinity in polymers. [3] Q11) a) How size and shape of atoms will affect LDF forces? Explain with examples. [6] b) Give list of all possible factors that contributes towards the intermolecular forces within a polymer. [10] OR Q12) a) Explain why solubility parameter needs to be known for polymers and how can it be found? [6] b) Give the effect of different types of intermolecular bonding forces on properties. [10] xxxx [3864]-381 3

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