Kevlar is a polyamide made from benzene-1,4-dicarboxylic acid and 1,4-diaminobenzene a Draw the structure of each monomer. b Draw the repeating unit of Kevlar. c Explain why this can be classified as a condensation polymer. (2

The addition polymer that has the formula shown is used in surgical sutures, dishwasher-safe food containers, thermal underwear, and many other products. C- H CH3 /n Draw one monomer unit. Show all hydrogen atoms. Select Draw Rings More Erase H

3. Draw the structure for the monomer(8) from which the following polymer is made and name the type of polymer (addition, polyester or polyamide). a) PETE (polyethylene terephthalate) 4 PETE 0-CH;-CH2 CH2 Polyester the monomers are: но-сн2-сн,—он and но OH b) PP (polypropylene) PP H CH; H CH, H CH; H CH; H H H HH Addition WPS Office the monomer is: H H

20. Which of the following is nylon 6,6? m Aujens A) 2 B) 3 C) 4 D) 1 21. Which of the following is a polycarbonate? A) nitrile rubber B) Lexan C) nylon 6 D) Dacron 22. What is the common name of the following polymer? CHCH, A) bisphenol A B) poly(ethylene terephthalate) C) nylon 6,6 D) polystyrene 23. Which of the following monomers cannot undergo chain growth polymerization? A) COOH-CH2-COOH B) CH2=CH2 C) CH₂-CHCN D) CH₂-CHCOOR 24. Which of the following statement is not correct? A) teflon is CF2=CF2 B) Phenol formaldehyde resin in known as bakelite. C) Caprolactam is the monomer of nylon-4 D) natural rubber, consits of Polyisopren mainly. 25. What does the binding energy between the propagating ion and the counter ion depend on? A) All of the mentioned. C) Nature of counter ion. B) Nature of reaction media. D) Temperature of the reaction

Draw the following organic compounds: a) 2-ethyl-4-methyl-2-pentanol c) 2-methylpropyl hexanoate b) 1,3-dimethylbenzene d) 2-aminoethanoic acid

Why is sulfur mustard comparatively less permeable to urethane polymer than polymers like polyethylene. Will a polyethylene gas mask be effective against sulfur mustard?