Download GTU BE/B.Tech 2017 Winter 8th Sem New 2182302 Polymer Alloys And Blends Question Paper

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Subject Code: 2182302

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. Q.1 (a) What are Blends and Alloys? Discuss. [03]
   

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   (b) Which are the reasons to make Polymer alloy/blends? [04]
   (c) How scanning electron microscope (SEM) is working? Discuss with neat diagram along with sample preparation and advantages. [07]

2. Q.2 (a) Define the followings: 1) Homologous Polymer blend 2) Compatible polymers blend 3) Immiscible polymer blends [03]
   (b) Which are the techniques used for the preparation of polymer blends? Discuss. [04]
   

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   (c) Discuss techniques for determination of polymer-polymer miscibility. [07]

   OR

   (a) Explain the Huggins-Flory theory for polymer blends. [07]

3. Q.3 (a) Two miscible polymers A and B are blended in weight ratio of 40:60. If the glass transition Temperature, Tg of polymer A is -10°C and that of polymer B is 70°C, calculate the Tg of the blend. [03]
   

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   (b) How to select the blend components? Explain. [04]
   (c) Explain thermodynamics of polymer blends. Give Phase diagram with LCST and UCST. [07]

   OR

   (a) Define: Block copolymer, graft copolymer and Interpenetrating Polymer Networks. [03]

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4. Q.4 (a) Explain the significance of Gas lattice model in blends. [04]
   (b) Discuss properties and applications of PVC/NBR & PC/PBT. [07]

   OR

   (a) Describe the properties and application of PPO/HIPS blends. [03]

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5. Q.5 (a) Describe the working of Two roll mills in polymer mixing with neat diagram. [04]
   (b) What is compatibilizer? List various compatibilization methods and explain addition block and graft copolymerization method. [07]

   OR

   (a) Write about PVC/ABS Blend. [03]

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6. Q.5 (a) Discuss various blends used to improve barrier properties for packaging applications. [04]
   (b) Describe Differential scanning Calorimeter (DSC) with neat diagram. [07]

7. Q.5 (a) What are composites? Give difference between alloys/blends and composites. [03]
   (b) Discuss Interfacial Adhesion and Degree of compatibility. [04]

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8. Q.5 (a) Which are the properties and applications of PC/ABS Blends? Discuss. [03]
   (b) Explain Melt Blending in detail. [04]
   (c) Describe the working of Banbury mixture with neat diagram. [07]

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