GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Name:Polymer Alloys and Blends
Time:10:30 AM TO 01:00 PM Total Marks: 70
3. Figures to the right indicate full marks.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
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Subject Code:2182302 Date:15/05/2019Subject Name:Polymer Alloys and Blends
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
| MARKS | ||
| Q.1 | (a) What are Blends and Alloys? Differentiate between polymer alloy and blend. | 03 |
| (b) List various steps to select the blend components. | 04 | |
| (c) Define following | 07 | |
| 1. Interfacial adhesion 2. Immiscible polymer blend 3. Homologous Polymer blend 4. Compatible polymer blend 5. Compatibilizer 6. Metastable miscibility --- Content provided by FirstRanker.com --- 7. IPN | ||
| Q.2 | (a) Explain Compatibilization method using block and graft copolymers. | 03 |
| (b) What are the reasons for making polymer blend? Discuss. | 04 | |
| (c) Discuss various techniques for determination of polymer-polymer miscibility. | 07 | |
| OR | ||
| (c) Discuss with neat diagram working principal of SEM along with sample preparation and advantages. | 07 | |
| Q.3 | (a) Which are the properties and applications of PC/ABS Blends? Discuss. | 03 |
| (b) Explain working of Two roll'mills in polymer mixing with neat diagram. | 04 | |
| (c) Discuss thermodynamics” of polymer blends. Give Phase diagram with LCST-and UCST. | 07 | |
| OR | ||
| Q.3 | (a) What are composites? Give difference between alloys/blends and composites. | 03 |
| (b) Explain the significance of Gas lattice model in blends. | 04 | |
| (c) Write a note on: Flory-Huggins theory | 07 | |
| Q.4 | (a) Describe the properties and application of PPO/HIPS blends. | 03 |
| (b) Which are the techniques used for the preparation of polymer blends? Discuss. | 04 | |
| (c) Describe Differential scanning Calorimeter (DSC) with neat diagram. | 07 | |
| OR | ||
| Q.4 | (a) Write about PVC/ABS Blend. | 03 |
| (b) List various compatibilization methods for Polymer blends. Discuss degree of compatibility. | 04 | |
| (c) Explain Twin screw extruder and its importance in preparation of polymer blends. | 07 | |
| Q.5 | (a) A polymer blend contains two polymers A and B in the ratio 30:70. If the glass transition Temperature, Tg of polymer A is -10°C and that of polymer B is 80°C, calculate the Tg of the blend. | 04 |
| (b) Discuss various blends used to improve barrier properties for packaging applications. | 07 | |
| (c) Describe the working of Banbury mixture with neat diagram. | 03 | |
| OR | ||
| Q.5 | (a) Write about Reactive Blending. | 04 |
| (b) Discuss fundamental principles for development of polymer alloys and blends. | 07 | |
| (c) What is FTIR? Discuss working of FTIR and its applications. | 07 |
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