Q1)a) Describe a typical polymer molecule in term of its chain structure and in

Q1)a) Describe a typical polymer molecule in term of its chain structure and in addition how the molecule may be generated by repeating mer units.b) Explain the polymerization process and sketch a graphical illustration about this.c) Briefly describe the crystalline state in polymeric materials.d) Explain the technics to improve or change polymer properties such as optical mechanical chemical electrical color thermal and density.Q2)a) Distinguish between single crystals and polycrystalline materialsb) Derive the relationships between unit cell edge length and atomic radius for BCC and FCC.c) For Titanium sketch the unit cell model and Compute the following:the unit cell volumethe number of atom per unit cellthe APF in the HCPthe theoretical density and compare it with the actual densityModule Leader: Dr Amir Kessentini CW1 Issued on 7thApr 2012Q3)A Brinell hardness measurement is made on a ductile iron using a 10 mm diameter sphere of tungsten carbide. A load of 3000 Kg produces a 3.91 mm diameter impression in the iron surface.a) Calculate the Brinell number of this alloy.b) Compare these values with those published.c) Is it possible to carry out the Vickers test for this alloy?d) Rockwell test hardness is suitable for what type of materials?Q4)The properties of some materials are profoundly influenced by the presence of imperfection.a) Explain how these imperfections affect the behavior of materials. Give example for each type of imperfection.b) Explain Solid solutions and provide a brief written definition and schematic sketch of each.c) Calculate the energy for vacancy formation in silver given that the equilibrium number of vacancies at 800oC is 3.6x1023atoms.m-3. The atomic weight and density (at 800oC) for silver are respectively 107.9 g/mol and 9.5 g/cm3.
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