Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-IV (NEW) EXAMINATION - WINTER 2018Subject Code:2143602 Date:05/12/2018
Subject Name:Rubber Chemistry & Natural Polymers
Time:02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
MARKS
Q.1 (a) Write down the Classification of Natural Polymers. 03
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(b) Write short notes on following: Proteins, starch & lignin. 04(c) Give examples of diene in EPDM rubber? Explain its properties and major applications 07
Q.2 (a) Write a note on Elastomers. 03
(b) Draw a flow chart for manufacturing of IIR 04
(c) Explain ozone resistant rubber, its preparation and reactions involved. 07
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OR(c) Write in detail preparation, properties and uses of Epoxy resins. 07
Q.3 (a) Define Tg & What is The Tg of Natural Rubber 03
(b) Why modification is important for natural polymers and rubbers? Explain with example 04
(c) Write about the raw materials and chemical reactions for Alkyd and amino resin. 07
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ORQ.3 (a) Write a note on nitrile rubber. 03
(b) Write a Detailed note on polyamides. 04
(c) Write short notes on any two 07
a) Styrene b) Butadiene c) cellulose d) unsaturated polyester resins
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Q.4 (a) Give the function of Blowing Agent, Plasticizers & Flame Retardant Agent 03
(b) Suggest a Rubber for the making of linning of Tank used for hexane. State its manufacturing process and other applications also. 04
(c) Elaborate the process of vulcanization. 07
OR
Q.4 (a) Write in detail preparation and uses of PU. 03
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(b) Write down various techniques of polymerization. 04(c) What is Chitosan? Write reactions for the preparation of chitosan from chitin and its application. 07
Q.5 (a) Explain mastication, compounding and curing. 03
(b) Describe in short the modification process of rubbers. 04
(c) Write chemical structures of following: Isoprene, Chloroprene, NBR, Buna-S, Natural Rubber, Neoprene, EPDM 07
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ORQ.5 (a) Which polymer is widely used for bio-medical applications? Explain its synthesis. 03
(b) Explain synthesis of Saturated and unsaturated Polyester. 04
(c) Write notes on any two: Hypalon, NR, limited olefinic functionality 07
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