In an A-A B-B step-growth polymerization reaction with an extent of reaction of p=0.999, 600 A-A monomers, 800 B-B monomers, and 71 B-R monofunctional monomers, what is the number average degree of polymerization?

This polymer is composed of 2 monomer units: an acid chloride and an amine. In the box below, draw the structure of both monomers. (8-10 C (CH₂)6-C CH₂ 어 H n • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate structures with + signs from the drop-down menu.

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Methyl methacrylate (or methyl 2-methylpropenoate in proper IUPAC nomenclature) is the starting material for the syntheses of poly(methyl methacrylate), also known as PMMA. The monomer is expressed as CH2=CH- COOCH3. Calculate the molecular weight of PMMA for which the degree of polymerization, n, is 5112. Express your answer in kilograms per mole. 0.10012 0.10012 Calculate the approximate stretched-out chain length of one of the chains, taking the C-C bond length to be 1.54 angstroms and ignoring the large side group's effect. Express your answer in microns. 45 45

9. Consider the two polymers Nylon 6,10, with the degree of polymerization of 100 and poly(ethyl methacrylate) with the degree of polymerization of 1200. (a) Write chemical structures of the polymers. (b) What polymer will have a higher value of real end-to-end distance in bulk? Assume that the values of characteristic ratio and bond length are the same for these polymers. 1/2 The equation for the end-to-end distance: (²) 11² = α (nCN) 1/21

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 →

d) Provide the structure for the chain end group X that would result from chain termination through the following termination mechanism: • Disproportionation: Structure of X = • Chain end radical recombination: Structure of X = • Hydrogen abstraction: Structure of X = d) Early in the polymerization at lower conversion of the MVK monomer, the polymer chains formed are primarily linear. However, close to the end of the reaction, as most of the monomer is consumed, branched polymers may start to appear. Propose a possible rationale for the formation of branched polymer structures (hint: consider the types of termination reactions that may compete with polymerization when only little monomer is still present). 32 linear vs. branched