GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V (New) EXAMINATION - WINTER 2019
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Subject Code: 2153606 Date: 29/11/2019Subject Name: Polymer & Rubber Material-11
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) Give the Name of Modified alkyds 03
(b) Name the polymer with structure for following applications and give 04 reason for choice: mold release agent & mattress
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(c) Write a short note on alkyd resin. Explain with types. 07 Q.2 (a) Explain CNSL Resin 03
(b) Write An Application & Properties of polyamides. 04
(c) Write a short note on synthesis and applications of Amino resin 07
OR
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(c) Why curing is important in case of thermosets? Discuss briefly the 07 mechanism of curing of epoxy system with various curing agents Q.3 (a) Compare sulfur vulcanization vs peroxide vulcanization. 03
(b) Write an explanatory note on epoxy-novalac & epoxy-acrylate 04 system.
(c) Explain in short the vulcanization of rubber and also the cross 07 linking technology.
OR
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Q.3 (a) What is fiber reinforced polyester? 03(b) Write Application of UF & MF 04
(c) Thermoset polymers are very useful in the coating application. 07 Name a thermoset polymer used for this purpose in washing machine application. Justify and describe the synthesis and properties of the polymer
Q.4 (a) Write an explanatory note on epoxy-novalac & epoxy-acrylate 03 system.
(b) Write a Application of Novolac Resin 04
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(c) Explain the synthesis; curing and applications of polyurethane resins 07OR
Q.4 (a) Write unique properties polyurethane resins. 03
(b) Write application & Properties of Kevlar Fiber 04
(c) Explain the reaction mechanism between phenol and formaldehyde 07 and process of forming PF resins.
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Q.5 (a) Write a Application of Epoxy Resin in Coating Industry. 03
(b) Why Thermosetting Polymers are Amorphous 04
(c) Explain the reaction mechanism between phenol and formaldehyde 07 and process of forming PF resins?
OR
Q.5 (a) Draw The Structure of Epoxy, MF, UF 03
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(b) What is silicones rubber? Mention its important application 04(c) Explain with example vulcanization & de-vulcanization of rubbers. 07
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