Question

I need help with the last question #7. Please help!

Preaboratory Assignment-Introduction to IR Spectroscopy Make use of the index in your textbook for information on the polymers' structures From the formulac in your text, draw the structure of the repeating groups of (a) polypropylene and (b) poly(cthylene glycol terephthalate): 1. 2. What atom is present in PVC that is different from the other examples of polymers in the text? (Note that the text index shows PVC under "vinyl chloride.") 3. Of the five chemical types of recyclable plastics on the previous page, which should give the simplest infrared spectrum, and why? 4. What is the "fingerprint" region of the infrared spectrum and why is it called this? 5. If an infrared spectrum displayed a deep, broad absorbance at about 3400 cm1, what groups could this be attributed to? 6. If a sample contained an aromatic ring, what evidence would you expect to see in its spectrum? 7. Obtain samples of five of the six recyclable plastics (1-6), and bring them to lab. Do not use any sample unless it has the recyclable number on it. The best samples for the instrument are slightly flexible, and free of printing ink. If it was food packaging, be sure that it is clean and dry. Also obtain a sample that is cither unlabeled or labeled (7) Recyclable Number None, or (7)

Answer 1

Recyclable Number Describe your sample 2 it has high strength hard and opaque good tensile strength it is 4 flexible and tough, translucent or opaque, low tensile strength 3 hard, good tensile strength, more compared to other plastics 5 stiff, low density, tough and flexible, good transparency 6 clear, hard, and rather .