JNTU B Tech ii Semester Examinations, Polymeric Materials, Apr/May 2008

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JNTU B.Tech II Semester Examinations,

                                                                                                              Polymeric Materials

, Apr/May 2008

(Metallurgy & Material Technology)

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks

SET-III

1. (a) What are thermosetting materials? Explain their ingredients and its manufacture.

(b) Discuss the various applications of thermosetting materials. [10+6]

 

2. (a) What is sedimentation? How is sedimentation coefficient determined?

(b) Give an account of the principles and technique involved in the end-group analysis. [8+8]

 

3. (a) What is extrusion moulding? List out the components produced by this process.

(b) Explain the zones prevailed in the extrusion machine during its operation. [6+10]

 

4. (a) What are photo degradients? Explain its role in polymers.

(b) Explain about colorants in polymeric technology. [10+6]

 

5. (a) Explain the chemical & mechanical properties of LDPE & HDPE.

(b) Discuss the important applications of LDPE & HDPE.

(c) What are the various raw materials used for the production of LDPE & HDPE?

Explain about them. [6+5+5]

 

6. (a) What are the major advantages and disadvantages of thermosetting plastics.

(b) What are the usual processes by which thermosetting plastics are process? Explain briefly their working principle. [8+8]

 

7. (a) What are polyesters? Distinguish between unsaturated and saturated polyesters.

(b) What is PETP? How is it manufactured? What are the raw materials used?

Give the properties and uses of PETP. [8+8]

 

8. (a) What type of rubber would you recommended for the following? Why? Give the necessary reasons.

i. For a fluxible connection to a steam line

ii. As a gasket for a pipe containing a cholorination solvent.

(b) Silicones are generally non-cryatalline in terms of molecular architecture. Explain.

(c) Explain what makes it possible, to cross link natural rubber with sulphur. [8+4+4]

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