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Posted By: gopal Member Level: Diamond Posted Date: 01 Sep 2008
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2005 Jawaharlal Nehru Technological University Chemical engineering III B.Tech II Semester Supplementary Examinations, November/December 2005 POLYMER ENGINEERING Question paper
Code No: RR320806 Set No. 4
III B.Tech II Semester Supplementary Examinations,
November/December 2005
POLYMER ENGINEERING
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Discuss the occurrence, chemical composition, method of extraction and ap-
plication of shellac.
(b) What are bio-polymers? Give few examples and also write the applications.
2. Define the reactivity ratios r1 and r2, and indicate their values for
(a) ideal
(b) alternating, and
(c) azeotropic co polymerization. [6+5+5]
3. (a) Explain light scattering photometer with neat sketch.
(b) Describe dynamic light scattering and neutron scattering. [8+8]
4. What is polymer degradation? Also explain briefly about various types polymer
degradation with examples. [16]
5. Write short notes on following:
(a) Anionic initiators.
(b) Fillers
(c) Cross-linking agents.
(d) Stabilizers [4x4=16]
6. (a) Discuss the properties of LLDPE in relation to its branched chain structure.
(b) Write short notes on ABS resins. [8+8]
7. (a) What are the raw materials used for the production of polyurethane? Also
write chemical equations for the polymerization as practiced industrially.
(b) What are the advantages of melamine formaldehyde powders over urea formalde-
hyde powders? [8+8]
8. Explain in detail the working principle of hot runner molds and runner less injection
molds. Also compare hot runner injection molds with runner less molds.
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