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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 3
--------------
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. Explain different types of condensation polymerization techniques. Discuss their
advantages and limitations. [16]
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) Classify the ferrous materials into i)Fillers and ii) Reinforcements Comment on their purpose and characteristics.
i. Carbon block
ii. Mica and
iii. Silica.
(b) What are
i. Antioxidants and
ii. Coupling agents in plastics. Give Examples for each Category. [8+8]
4. Explain the properties, chemical formula, functional behavior and applications of
the following antioxidant additives in polymers.
(a) Arylamines
(b) Hindered phenols
(c) Peroxidolytic Antioxidants [5+6+5]
5. (a) What are some advantages and disadvantages of the injection molding process for molding thermoplastics.
(b) Describe with the help of a neat sketch the extrusion process for processing thermoplastics. [8+8]
6. Give and Explain the polymerization reactions for the following thermo setting plastics along with their properties and applications
(a) Phenol
(b) Urea- Formaldehyde resin. [8+8]
7. (a) Explain the principles of strengthening mechanisms operative in polymers. Explain them.
(b) Illustrate the bonding between polymer chains of nylon 6,6. Why is the bonding particularly strong. [8+8]
8. (a) Explain what makes it possible to cross link natural or synthetic rubber with
sulphur.
(b) A rubber contains 54% Butadiene, 34% isoprene, 9% sulphur and 3% carbon black. What fraction of the possible cross links are Joined by Vulcanization, assuming that all the sulphur is used in cross-linking.
Given
Mer weight of Butadiene: 54
Mer weight of Isoprene : 68
Atomic weight of ‘S’ : 32
Atomic weight of ‘C’ : 12 [6+10]
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