18. The type of polymerization in the following reaction is ... polymerization. H a) Condensation b) Addition c) Elimination d) Isomerization e) Aromaticity 11.0' H H

into the book. Write a concise definition of each, using examples as appropriate.

3. Another type of Nylon can be made from 1,4-butanediamine and sebacoyl chloride: | CI - C(CH2);C –- CI H2N(CH2)4NH2 and a. Draw the structure of the polymer formed. Draw parentheses around the repeating unit. b. Is this an addition polymerization or a condensation polymerization reaction? (Circle your choice) c. What molecule will be eliminated in this reaction? d. What name (with numbers) would you give to this polymer? In the repeating unit, circle and label the amide bond. е.

6. Dacron is the brand name for the polymer that is made from ethane-1,2-diol and benzene-1,4-dicarboxylic acid. (a) When the two monomers combine, what type of reaction do they undergo and what molecule is eliminated? [1] (b) What is the name for the linkages that join the monomers together? [1] (c) Draw the monomers and the polymer of the reaction to create Dacron. [3]

QII: Distinguish between the following reactive intermediates in chain- growth polymerizations: 1. Radicals 2. Carbanions 3. Carbocations 4. Organometallic complexes

6. Molecular weight data for some polymer are tabulated. Determine: a) The number-average molecular weight The weight-average molecular weight If it is known that this material's number-average degree of b) c) polymerization is 458, which one of the polymers listed in Table 16.3 is this polymer? d) What is the weight-average degree of polymerization for this polymer? Molecular Weight Range (g/mol) X W; 8,000-20,000 20,000-32,000 32,000-44,000 44,000-56,000 56,000-68,000 68,000-80,000 0.05 0.02 0.15 0.08 0.21 0.17 0.28 0.29 0.18 0.23 0.10 0.16 80,000-92,000 0.03 0.05

5. Complete the following condensation polymerization reactions by drawing the structural formula of the repeating unit of each polymer, as well as any other products. heat a. n HOČ(CH2)2COH + n H2NCH;CH;NH2 → b. n CIC(CH2)6CC1 + n H2NCH2CH2NH2 → heat n HOC(CH2)2COH + n HO(CH2)4OH = n CIC(CH2),CCi + n HO(CH2)½OH →

1.Consider the polymerization of the following monomers: H2N- -NH2 CI (a) Draw the repeat unit of the resulting polymer. (b) Identify the two structural units comprising the repeat unit. Aramids are produced using the reaction of a benzene-1,4-diamine and a terephthaloyl dichloride.

47. Which of the following monomers is used in making the polymer illustrated below? 国” ID: A a, b. e.

2. The structure below represent part of a polymer chain. Draw the full structural forma monomer. H. CH H CH H CH, C-C- C-C- C-C- 1. CH, H CH, H CH, H