GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018
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Subject Code: 2172311 Date: 26/11/2018Subject Name: Plastic Structure Property Relationship
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) Define additives? List various additives used for plastics. 03
(b) Draw the structures of i) PTFE ii) PVC iii) Nylon 6,6 iv) 04
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PS(c) List the differences in properties of crystalline and 07
amorphous polymers.
Q.2 (a) What are the important fields of application of PVC. 03
(b) Explain with examples what are Homochain and 04
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Heterochain polymers.(c) Explain the factors affecting the Tg of a polymer 07
OR
(c) Explain the effect of Hydrogen on the properties of 07
polymers
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Q.3 (a) List the properties and applications of PMMA. 03
(b) Explain the effect of plasticizers on Tg of a polymer. 04
(c) Compare the structure & properties-of HDPE and LDPE. 07
OR
Q.3 (a) What do you mean by tensile strength and impact strength 03
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of a polymer.(b) Why is Teflon used in the applications of non stick 04
coatings?
(c) Explain the effect of Carbon on the properties of 07
polymers.
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Q.4 (a) What are blowing agents? Explain briefly. 03
(b) Explain how structure of a polymer affects its mechanical 04
properties.
(c) Explain the factors affecting crystallinity in polymers. 07
OR
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Q.4 (a) How does silicon affect the properties of a polymer. 03(b) List the points of difference between thermoplastics and 04
thermosets.
(c) Write a short note on effect of halogens on properties of a 07
polymer.
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Q.5 (a) Explain the relationship between structure of a polymer 03
and its optical properties.
(b) Why is Nylon used extensively for the manufacture of gears and 04
bearings?
(c) Discuss the structure and the properties of Bis-phenol A 07
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Polycarbonates. What are its important applications? OR
Q.5 (a) Explain giving examples what are Homo polymers and 03
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Copolymers.(b) Which are the different forms of PP? List the applications 04
of PP.
(c) Compare the structure of PVC with that of PE and explain how 07
the structure is related to its properties.
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