Question

Questions for Experiment 8: Preparation and Properties of Polymers - Polyester and Nylon 1. Which polyester should be theoretically more rigid, the one obtained from ethylene glycol or the one from glycerol? Why? Explain with structural arguments. 2. Draw the structure for the polymer produced from the monomer vinylidene chloride CH-00) 3. Draw the structure of the copolymer produced from vinyl acetate and vinyl chloride. This copolymer is employed in some paints, adhesives, and paper coatings 00CH, CI coc Vinyl att lande 4. Isobutylene, CH-CICH), is used to prepare cold-flow ribbet. Draw a structure for the ad. dition polymer formed from this alkene 5. Did your experimental results confirm the theoretical results from question 1? Why / Why not? 6. Malek anhydride reacts with ethylene glycol to produce an alkyd resin. Draw the structure of the condensation polymer produced Lo Malekande 7. Kodelis condensation polymer made from terephthaliacid and I cyclohexanedimethanol Write the structure of the resulting polymer. lou non Denon Turephthalic add 14 Cydohexanedimethanol

Answer 1

Solution:

1) Polyesters formed by glycerol will be theoretically more stable due to higher boiling point of glycerol. The boiling point of glycerol is  290 °C, while that of ethylene glycol is 198 °C. The increase in boiling point of glycerol is due to increase strength of hydrogen bonding. Glycerol forms a crossed linked polymer due to presence of three hydroxyl groups. The high boiling point and higher cross linking ability of glycerol causes an increase in rigidity of the polyester.