Q. 6. Match the product in group 1 with the nature of reaction in group 2 :
Group 1 |
Group 2 |
| a. Polyethylene | 1. Condensation Polymerization |
| b. Nylon | 2. Addition Polymerization |
| c. Polystyerene |
Ans:
- a-2
b-2
c-1
Q.7. What kind of catalyst in the Low Pressure Zeigler Process for the manufacture of polyethylene ?
Ans : Aluminium triethyl combined with titanium tetrachloride.
Q. 8. Match the processes used for producing various products from PVC ?
Group 1 |
Group 2 |
| a. Extrusion | 1. Rexin / Leather cloth |
| b. Injection Moulding | 2. Rigid containers / bottles |
| c. Blow Moulding | 3. Pipe fittings |
| d. Calendering | 4. Rigid pipes |
Ans:
- a-4
b-3
c-2
d-1
Q.9 What does the Ziegler – Natta catalyst consist of ?
Ans9 . The Ziegler Natta catalyst consists of a combination of HF and BF3
Q.10 Which two polymerization methods are commonly used for the manufacture of polyvinyl chloride ? Mention some of the disadvantages of using PVC as a polymer?
Ans10 . Two methods for manufacture of PVC are Emulsion Polymerization and Suspension Polymerization.
Disadvantage of PVC is that it has low solvent solubility. In addition to this, the heat stability of PVC is poor.
Q11. What is the main criteria based upon which Polyethylene is classified ?
Ans11 . Based upon its density and molecular bonding.
Q12. Which of the following has a higher melting point – Nylon -6,6 or Nylon -6 ?
Ans12 . Nylon – 6,6 has a higher melting point than Nylon -6 ( about 40 – 45° higher).
References :
1. Ullmann F., Encyclopedia of Industrial Chemistry, Wiley – VCH, 1999-2012
2. Kirk R. E., Othmer D. F., Encyclopedia of Chemical Technology, John Wiley and Sons, 1999-2012