Anna University Thermoset and Additives Model Test Paper
FIFTH SEMESTER- THERMOSET AND ADDITIVES
Time: 3 Hours Max. Marks: 100
Answer all the Questions Part A (10 x 2 = 20 marks)
1.What are alkyds? How are they prepared?
2.What is the role of styrene in unsaturated polyester resin?
3.What is epoxy novalac? Give its importance.
4.List few inorganic polymers.
5.What are the salient features of antistatic agents? Give examples.
6.What is master batch? Give its advantages.
7.What are antiblocking agents? Explain their role with examples.
8.List the applications of polyurethanes.
9.Why are filters added to polymers?
10.Mention the various curing agents employed in epoxy resin system.
Part B (16 x 5 = 80 marks)
(Question No.11 is compulsory and answer totally 5 question from this Part B)
11.a)Giving a neat sketch of the flow diagram, describe the process for manufacture of polyurethane.
b)Mention the important properties of polyurethanes
12.a)Distinguish the resole and novalac types of phenolic resins. Explain the reactions leading to the formation of resole.
12.b)i) Write briefly synthesis and curing of unsaturated polyester resins
ii) Curing characteristics of polyester resins
13.a)i) What are the raw materials required for the manufacture of epoxy resins.
ii) Discuss briefly the mechanism of curing of epoxy system with various curing agents.
13.b)i) Mention important applications of epoxy resin systems
ii) Write an explanatory note on epoxy novalac system.
14.a)i) What are the desirable properties of polymer additives
ii) Describe the functions of the different additives incorporated in the preparation of polymeric materials.
14.b)Discuss the mechanism of plasticisation with suitable examples. Differentiable between internal and external plasticisation.
15.a)Write notes on
i) Flame retardants
iii) Nucleating agents
iv) Blowing agents
15.b)i) How do certain ingredients improve the mechanical properties of polymers?
ii) Explain the mechanism of antioxidants.