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Posted By: Sra1 Member Level: Diamond Posted Date: 28 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Plastic and Polymer PLASTICS AND POLYMERIC MATERIALS (Supplimentary Examinations, Aug/Sep 2007) Question paper
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Set No 4
------------------
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) What are special properties of plastics that make them useful in Engineering materials?
(b) What are lenier polymers? Explain the differences between addition and condensation polymerization. [8+8]
2. (a) List and Explain the factors that promote non crystallinity chain polymers. [6]
(b) Explain how does
i. solvents and
ii. Catalysts affect the performance of polymers. [2x5=10]
3. (a) What do you mean by virgin polymer or virgin resin.
(b) What are the various ingredients ?added to virgin polymers before processing and
(c) Explain the effect of different ingredients incorporated to virgin polymers to improve their properties. [4+6+6]
4. (a) What are the functions of the following in plastics
i. Kaolin
ii. Alumina Trihydrate
iii. Metal filaments [3x3=9]
(b) What are
i. Blowing agents and
ii. Sizing agents. What is their use in plastic manufacturing. [7]
5. (a) The common copolymer is produced by including both ethylene and propylene monomers in the same chain. Calculate the molecular weight of the polymer produced using 1 kg of ethylene and 3 kg of propylene giving a degree of polymerization of 5000.
(b) The distance between the centers of the two adjacent carbon atoms in linear polymers is approximately 0.15nm. Calculate the length of an ultra high molecular weight polyethylene chain that has a molecular weight of 1,000,000 gm/mole. [8+8]
6. (a) What are some of the advantages of thermosetting plastics for Engineering design applications? What is the major disadvantage of thermosets which thermo plastics do not have?
(b) What are the major processing methods used for thermo sets. Explain[10+6]
7. (a) What are the important Engineering applications of Acetals
(b) What type of materials have acetals commonly replaced? Why.
(c) Explain carother’s Equation. [5+6+5]
8. (a) What is silicone.
(b) Explain the important properties of silicon.
(c) Explain the following types of Nylons.
i. Nylon ?6
ii. Nylon 10. [3+5+4+4]
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