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2003 Course Polymer Composites & Blends

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Total No. of Questions : 12] [Total No. of Pages : 3 P949 [3664] - 295 B.E. (Polymer Engineering) POLYMER COMPOSITES AND BLENDS (2003 Course) (409363) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 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) b) c) Discuss in detail all E s or advantages in employing polymer blend technology. [6] Classify the polymer alloys and blends on the basis of Miscibility and methods of preparation with one example. [8] Discuss the significances related to processing via polymer blend technology. [4] OR Q2) a) Explain different polymeric modifier used to improve the following properties such as impact strength, chemical resistance, heat deflection temperature, flame resistance and barrier properties. [8] b) Explain the term polymer alloy with its importance. c) Discuss the advantages and disadvantages of the following engineering polymeric modifier : [6] i) Polycarbonate. ii) [4] Acrylonitrile Butadiene Styrene (ABS). P.T.O. Q3) a) b) Discuss with necessary diagram the effect of temperature on the phase stability. [6] Explain the importance of molecular weight parameter with necessary diagram on the miscibility of polymer blend systems. [10] OR Q4) a) b) Q5) a) b) Define the term spreading coefficient and discuss with examples the method of compatibilization via addition of block or graft copolymers. [10] Discuss with suitable diagram all function of compatibilization. [6] Write a short note on Elastomer Alloy. [6] Discuss in detail the applicable models to understand the Rheology of [10] Miscible Blend systems. OR Q6) a) b) c) Write a note on classification of polymer Blends on the basis of log additivity rule in terms of viscosity and volume fraction. [2] Discuss in detail the applicable models to understand the Rheology of Immiscible Blend systems. [10] Write a note on any one Commercial polymer blend involving engineering polymer. [4] SECTION - II Q7) a) b) c) State various commercially available unsaturated thermosetting polyester resins forms and explain any four grades of the same along with their formulation and applications. [8] What is Reinforcement and list the different types and forms of the reinforcing materials? Compare the Aramide Fiber reinforcements with Boron Fiber Reinforcements. [6] Define the term composite and explain in detail the different constituents of the composite with their functions. [4] OR [3664]- 295 2 Q8) a) b) Q9) a) b) What are the selection criteria s used for Epoxy resin used in composites and list the various commercial grades of the same and brief about diluents used in epoxy resins. [8] Explain the three stages of the curing reaction of the unsaturated thermosetting polyester resin with its significances. Discuss the various catalyst used in unsaturated thermosetting polyester resin curing and classify them and explain any one in detail. [10] What is Resin transfer molding process and name any two products manufactured by the same process and compare the same with Vacuum [8] bag forming process. What are different winding techniques used in filament winding? State and explain any four process parameter that affect the quality of filament winding products. [8] OR Q10)a) b) Q11)a) b) c) Explain with neat sketch spray lay up process? Compare what are the advantages of the same over hand lay up and state what are the products [8] manufactured by the spray lay up technique. Write in detail about Gel Coat used in composite. [8] What are Nano composite? How they are classify and compare the Nano composite with conventional composite system. [6] Explain in brief the necessity of Maintenance of FRP products? What are the different methods of maintenance used for the composite? [6] Write a note on trouble shooting in hand lay up process. [4] OR Q12)a) b) b) Explain with neat sketch repairing techniques of holes on the composite product accessible from both sides. [6] Write a note on application of Nano composite. [6] Write a note on trouble shooting in pultrusion process. [4] vvvv [3664]- 295 3

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