Anna University Chennai 2003 B.Tech THERMOPLASTICS MATERIALS-Polymer Technology - Question Paper

Time : 3 hours Maximum : 100 marks

ans ALL ques..
PART A — (10x2 = 20 marks)

1.What is environmental stress cracking?
2.What are ionomers?
3.Why PVC has poor thermal stability?
4.List out the applications of poly (vinyl alcohol).
5.Why ABS is blended with (i) PC and (ii) PVC?
6.Why vinylchloride is added to vinylidene chloride monomer?
7.What are glass–clear polyamides? provide examples.
8.List out the properties of polyethylene terephthalote.
9.What are structural foams?
10.Why camphor is added to cellulose Nitrate?

PART B — (5x16 = 80 marks)

11.Discuss the structure and properties of LDPE, HDPE, LLDPE and PP.
(4 + four + four + 4)
12.(a)(i)What are crosslinked polyethylene? discuss its preparation and applications. (8)
(ii)Explain the properties and application of UHMWHDPE. (8)
Or
(b)(i)Discuss the manufacturing process for PVC. How do you measure its molecular weight? (6 + 2)
(ii) What are Plastisol and Organisal? List out its applications. (6 + 2)
13.(a)(i)Discuss the preparation, properties and application of polystyrene.
(12)
(ii)What are expanded polystyrene? List out its applications. (4)
Or
(b)(i)Discuss the preparation, properties and applications of ABS. (12)
(ii)Explain the preparation and properties of poly (vinyl acetate). (4)
14.(a)(i)Explain the preparation of Nylon six with chemical formula. Why and what post polymerization treatment is needed for Nylon 6?
(6 + 4)
(ii)Describe and discuss the relation ranging from moisture content and toughness in Nylon 66. (6)
Or
(b)(i)Discuss the preparation, properties and application of Polycarbonate. (10)
(ii)Describe the preparation of Acrylic sheets. (6)
15.(a)(i)Discuss the preparation, structure and properties of PTFE. (10)
(ii)Write a note on polyacetal and its blends. (6)
Or
(b)(i)What are polyurethanes? How will you prepare thermoplastic polyurethanes? discuss its structure and properties. (10)
(ii)Write a short note on
(1)Cellulose acetate and
(2)Ethyl cellulose. (3 + 3)

Earning:   Approval pending.