Polymer — DU B.Sc. (Prog.) Applied Physical Science with Analytical Methods in Chemistry & Biochemistry Previous Year Question Papers

1. (a) Write IUPAC name of polymer and structure of repeat unit of the following polymers: (iii) Polyvinyl chloride (b) How does polymer classified on thé basis of modes of formation?. (c) Atmospheric oxygen is very good inhibitor. 2. (a) What do you understand by primary structure of polymer ? Explain. 6 (b) Distinguish between homopolymer and copolymer. 5 (c) What is emulsion polymerization ?.; 3. (a) Discuss Free volume theory. What is WLE equation? (b) Enlist the factors affecting Crystallization Melting temperature of a polymer and explain it by giving reasons. 5 (c) Why is range of Glass Transition Temperature observed ? Give reasons for higher strength of HDPE (High Density Polyethylene) as compared to Paraffin wax. 4. (a) What do you, understand by. 'Texture of polymer'? Explain it. 5 (b) What is degree of polymerization ? If M, of polystyrene is 4,16,000, calculate the degree (e) Define Polydispersity Index. Give its 5. (a) Atactic polypropylene is generally amorphous, soft and flexible while its isotactic form is crystalline, hard and tough. (b) What is a Zieglar-Natta catalyst ? Discuss its application in the polymer preparation. (c) Describe the light scattering method for the determination of molecular weight of a polymer. 5 6. (a) What are conducting polymers ? Write the applications of conducting polymers. 5 (b) Discuss the kinetics of Anionic addition polymerization and derive the expression for kinetic chain length for this type of polymerization.