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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
Set No 1
------------------
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Explain the following in detail.
i. Polymerization conditions
ii. Tacticity. [5+5]
(b) Differentiate Zeigler Natta polymerization from normal addition polymeriza-
tion. [6]
2. (a) What are the 2 methods by which a linear chain polymerization reaction can be terminated? Explain them.
(b) What is the functionality of a polymer? Distinguish between a bifunctional
and trifunctional monomer.
(c) What causes a poly Ethylene molecule chain to have a Zigzag configuration. [6+5+5]
3. (a) Give and Explain the important characteristics of a plasticizer. [4]
(b) What plasticizer would you use with the following and why?
i. Poly vinyl chloride
ii. Cellulose acetate
iii. Nitro cellulose [4x3=12]
4. Explain the following:
(a) Oxidative degradation of polymers
(b) Photodegradation of polymers
(c) Autoxidation. [5+6+5]
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) How much formaldehyde is required to completely crosslink 10kg of phenol to produce a thermosetting polymer. How much by product is evolved?
(b) Describe the atomic structural arrangements of thermosetting plastics
(c) Describe with the help of a neat sketch compression molding process for ther-
mosetting plastics. What are its advantages and limitations. [6+5+5]
7. (a) What is Nylon? Discuss the various types of Nylons and their properties.
(b) Suggest a suitable polymer along with its manufacturing process for Electric Iron handle. Justify your selection. [8+8]
8. (a) Explain the types of structure and molecular arrangement desired for producing synthetic rubbers.
(b) What are the various additives added to raw rubber to get desired properties?
Explain them. [8+8]
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