GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018
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Subject Code: 2173603 Date: 15/11/2018Subject Name: Evaluation & Testing of Polymers & Rubber
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Write a note on UTM. 03
(b) Elaborate viscoelastic behavior of rubbers. 04
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(c) Explain Relative, Specific, Reduced, Inherent, Intrinsic Viscosity and Fatigue Resistance 07Q.2 (a) Explain Vicat softening temperature. 03
(b) Describe method of determination of Melt Flow Index of Thermoplastic materials 04
(c) Discuss XRD in detail. 07
OR
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(c) Write short note on: (i) Brookfield rheometer (ii) Cone and plate flow 07Q.3 (a) Define Impact resistance. Mention its usefulness. Also draw a typical stress-strain curve of: polystyrene, HIPS and natural rubber 03
(b) Describe the method for determination of viscosity average molecular weight of polymers. 04
(c) Write in details about the importance of testing of polymers and rubber. 07
OR
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Q.3 (a) Define: storage modulus; loss modulus and tand 03(b) How is Hardness of polymer/rubber determined? Mention with Types 04
(c) Draw instrumentation diagram of UV spectroscopy, write its principle and applications. 07
Q.4 (a) Define glass transition temperature of polymers. Describe briefly:method of determination of Tg 03
(b) Explain DSC with Curve. 04
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(c) Explain limiting oxygen index with neat sketch 07OR
Q.4 (a) Explain following terms: breakdown voltage, Arc resistance 03
(b) Write difference between melting temperature & softening temperature? 04
(c) What information do you get from following test? Mention their usefulness in product design: DSC, Izod and Charpy test?. 07
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Q.5 (a) Explain in detail about Thermo Gravimetric Analysis (TGA). 04
(b) What are the major applications of UV, IR, and NMR spectroscopy? 07
OR
(a) What is Smoke Toxicity Test? 03
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(b) Describe the working principle of GPC method used to determine Molecular Weight of Polymers 04(c) Define the following: 07
Elongation-at-break, Strain, Ultimate tensile strength, Yield Strength, Proportional Limit, Modulus of Elasticity, Toughness.
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