GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
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Subject Code: 2172311 Date: 28/11/2019Subject Name: Plastic Structure Property Relationship
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) Differentiate between thermoplastic & thermoset behavior of plastics. 03
(b) Draw the structures of 1)PS ii)PMMA iii)PVOH iv)Teflon 04
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(c) Discuss about the structure and properties of HDPE & LDPE. 07
Q.2 (a) Draw the isotactic, syndiotactic and atactic structures of PP. 03
(b) Explain about Homo chain & Hetero chain plastic giving examples. 04
(c) Discuss about the effect of carbon on the properties of polymers. 07
OR
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(c) Discuss about the effect of plasticizers on the properties of polymers. 07
Q.3 (a) Explain with examples about Homo polymers & Copolymers. 03
(b) Compare the properties of crystalline & amorphous polymers. 04
(c) Discuss about the effect of oxygen on properties of polymers. 07
OR
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Q.3 (a) What are additives? List various additives used for plastics. 03
(b) Explain how structure of a polymer affects its mechanical properties. 04
(c) Draw the structure and describe the properties & applications of Nylon 66. 07
Q.4 (a) List the applications of PP and HDPE. 03
(b) PE has a Tg of -20 deg C but it appears to be solid at room temperature. Why? 04
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(c) How does presence of halogens affect the properties of polymers? 07
OR
Q.4 (a) Describe the properties of Teflon. 03
(b) List the properties & applications of PMMA. 04
(c) Discuss about structure & properties of Bisphenol A polycarbonates. What are its important applications? 07
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Q.5 (a) Compare the structure of PVC to PE 03
(b) Discuss briefly about effect of molecular weight on properties of polymers. 04
(c) Explain the factors affecting Tg of a polymer. 07
OR
Q.5 (a) Why PVC has self extinguishing properties? Explain. 03
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(b) Explain about blowing agents with examples. 04
(c) Explain the factors affecting crystallinity of a polymer. 07
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