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2003 Course Polymer Composites & Blends

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Total No. of Questions : 12] P1371 [Total No. of Pages : 3 [3764]-353 B.E. (Polymer Engg.) POLYMER COMPOSITES & BLENDS (2003 Course) (409363) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answers to the two sections should be written in separate books. 2) Draw neat diagrams wherever necessary. 3) Numbers to the right indicate full marks. 4) Assume suitable data, if necessary. 5) Use of logarithmic table, electronic pocket calculators is allowed. SECTION - I Q1) a) Discuss the role of polymeric modifier for achieving improvement in the Impact Strength, Heat Deflection temperature and Chemical Resistance, Flame resistance of the polymer blends. [8] b) Explain the merits and demerits of solution blending over melt blending. [8] c) Discuss the term polymer alloys. [2] OR Q2) a) Discuss with one example how to achieve the selection of the polymers to prepare the polymer blends. [6] b) Draw and explain in detail the schematic representation of the steps to be taken when developing polymer alloys and blends with a specified set of desired performance characteristics. [10] c) Discuss the term polymer blend. [2] Q3) a) Discuss Equilibrium Morphology and phase inversion concept in polymer blends. [8] b) Distinguish between Coupling agent Vs Compatibilizer. [8] OR P.T.O. Q4) a) Discuss then role of thermodynamics in polymer blend technology.[8] b) Discuss with the example the principle of Compatibilization by the addition of block and graft copolymer with suitable examples. [8] Q5) a) Write a note on Rheology of Polymer blends. b) Explain the followings : i) [8] Semi-IPN ii) [8] Sequential-IPN OR Q6) Write a note on the followings : [16] a) Toughened PA6. b) Blends of PPO/PS. c) Interpenetrating Polymer Network. d) Commercial Blends of PP. SECTION - II Q7) Explain with two examples the functions of the following constituents in composite manufacturing : [18] a) Gel Coat, b) Mold Release Agent, c) Reinforcement, d) Matrix, e) Fillers, f) Curing Agent, g) Accelerator, h) Adhesion Promoters, i) Pigments. OR Q8) a) What are different types of polyester resin used in composite? How they classified? Explain heat resistance and low shrinkage polyester resin. [8] b) State different types of glass used in composite? What factors to be considered for the selection of reinforcement? Explain types of reinforcement on basis of pattern of weaving? What are carbon fibers? [10] [3764]-353 -2- Q9) a) Differentiate between Hand layup and Spray layup techniques. [4] b) Explain Pultrusion process with neat sketch. [8] c) Discuss different types of winding pattern in filament winding. [4] OR Q10) a) Differentiate between Vacuum bag forming and Pressure bag forming. [4] b) Explain Resin Transfer Molding process with neat sketch. [8] c) Explain effect of process parameters on properties of spray layup technique products. [4] Q11) a) Trouble shooting in Hand Lay Up Technique. [8] b) State the repair techniques used in composite. Explain the repairs [8] technique used for macro cracks in composites. OR Q12) a) Discuss the Nanocomposites with one example. b) Trouble shooting in Filament winding Technique. rrrr [3764]-353 -3- [8] [8]

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