1. Mention and illustrate 7 types of copolymers. [7] 2. Draw the structure of the idealized modulus-temperature for thermoplastic and thermosets curve and mention all the transitions. [3] 3. Differentiate between the initiation, propagation and termination steps of a chain reaction polymerization. [2] 4. Show a laboratory preparation of polycarbonate and propose a mechanism. 5. Why for Kevlar the Cis conformation is impossible. Draw the structure, illustrate and explain [3] 6. Give a reaction for the synthesis of Polysulfides. 7. Differentiate between hydrogen, ionic and covalent bonding. Hint. Draw and motivate. [4] 8. Give 3 differences between van der Waal and dipole forces Hint. Draw and motivate. [3] 9. Give 5 differences between HDPE,LDPE and LLDPE. [5]