Download GTU B.Tech 2020 Winter 7th Sem 2172309 Plastic Structure Property Relationship Question Paper

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Subject Code: 2172309

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020

Subject Name: Plastic Structure property relationship

Time: 10:30 AM TO 12:30 PM

Instructions:

Attempt any FOUR questions out of EIGHT questions.

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Make suitable assumptions wherever necessary.

Figures to the right indicate full marks.

1. Q.1

   1. Give the structures of 1) PVOH 2) ABS 3) Nylon 66 [03]
   2. List the points of difference between Thermoplastics and Thermosets. [04]

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   3. Give comparison between structure and properties of HDPE with LDPE. [07]

2. Q.2

   1. List the applications of PMMA. [03]
   2. List the points of difference between Homochain and Heterochain polymers. [04]

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   3. Explain the factors affecting Tg of a polymer. [07]

3. Q.3

   1. What are additives? List the additives used in Plastics. [03]
   2. Explain why Nylons are suitable for the manufacture of gears. [04]

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   3. Compare the properties of crystalline and amorphous polymers. [07]

4. Q.4

   1. Compare the structure of PVC to PE. [03]
   2. Explain briefly the mechanical properties such as tensile strength and impact strength of a polymer. [04]

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   3. Explain the effect of Carbon on properties of a polymer. [07]

5. Q.5

   1. Why is PE solid at room temperature even though it has a Tg of -120° [03]
   2. How does the presence of silicon affect the property of a polymer? [04]

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   3. Explain the factors affecting crystallinity of a polymer. [07]

6. Q.6

   1. Explain Homopolymers and Copolymers with examples. [03]
   2. What are plasticizers? How do they affect the Tg of polymer? [04]

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   3. Explain the effect of Hydrogen on the properties of a polymer. [07]

7. Q.7

   1. What are flame retardants and how do they function? [03]
   2. Explain briefly what are Reinforcement and Fillers. [04]

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   3. How does the presence of halogens affect the properties of a polymer? [07]

8. Q.8

   1. Explain briefly what are blowing agents. [03]
   2. List the properties and applications of PTFE. [04]

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   3. Explain the structure, properties and applications of Bis-phenol A Polycarbonates. [07]

Date: 25/01/2021

Total Marks: 56

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