1. (a)describe the two stage preparation of polyurethanes with the reaction
      equation.
   (b)draw the morphologies of this sythesized polyurethanes
   (c)why the polyurethane has better mechanical properties from this process
      by their morphology configuration ?

2. how to prepare the elastomer thermoplastic polyurethane and rigid plastic-
   like polyurethane by changing the diisocyanate/ polyol/ chain extender
   equicalent ratios?

3. describe the preparation of flexible and rigid polyurethane foam by
   changing their components and explain their foaming mechanism.

4. describe and draw the photolithography process with positive and negative
   photoresists.

5. describe the two structure types of acrylic resins and how to choose the
   type of these resin for applying in adhesives and plastic production.

6. describe the structure of diglycidyl ether of bisphenol A(DGEBA) epoxy resin
   and its reaction equation with primary amines(R-NH2)

7. describe the epoxy reaction mechanism by tertiary amines (R3N:)
   catalyzed to the polymer.

8. describe the liquid crystal materials structural groups and their
   functional character.

9. describe the TFT-LCD configuration and its displaying principal in the
   LCD