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![4. Draw the chemical structure of poly(N-isopropylacrylamide)-block-[poly(styrene-co-methyl
acrylate)].](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F08696192-3a7c-4038-80f8-77daf59dd278%2Fee409a13-bc46-4e78-86ad-6693b247cbfe%2F626ek3i_processed.png&w=3840&q=75)
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- Draw structural formulas for the repeat units in these polymers.(1) polymethylene(2) polyformaldehyde(3) poly(phenylene oxide)(4) poly(1-acetoxyethylene)(5) poly(methyl acrylate)4. Describe how the stereoisomerism affect the degree of crystallinity of a semicrystalline polymer such as polyethylene.a. What molecular features make a polymer flexible? Explain how cross-linking affects the properties of polymer? b. In copolymers made of ethylene and PMMA, the melting point and degree of crystallinity decrease as the percentage of PMMA increases. Suggest an explanation for this observation.
- b Explain why nylon-6 can be classified as a polyamide. c Explain why some chemists classify nylon-6 as an addition polymer and not a condensation polymer. d Suggest the product of hydrolysis of nylon-6.Sketch the repeat structure for each of the following alternating copolymers. a) poly(butadiene-chloroprene) b) poly(styrene-methylmethacrylate) c) poly(acrylonitrilevinylchloride)How does crosslinking change the properties of polymer?
- Polyethylene (PE), polyvinylchloride (PVC), polypropylene (PP), polystyrene, an nylon are examples of1. What are biodegradable polymers and their classification ( include its functions and importance)?1.Consider the polymerization of the following monomers: H2N- -NH2 (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. (c) Plot the Mn of the polymer vs. the extent of reaction, where the extent of reaction increases from 0 to 0.95 in intervals of 0.05, and extend the plot include data points for an extent of reaction = 0.96, 0.97, 0.98, 0.99, and 0.995. (d) What is the extent of reaction when the molecular weight reaches 30 000 g/mol? (e) State two conditions that must be ensured for a step growth polymerization to reach high conversion.
- Poly(lactic acid) (PLA) has received much recent attention because the lactic acid monomer [CH3CH(OH)COOH] from which it is made can be obtained from carbohydrates rather than petroleum. This makes PLA a more “environmentally friendly” polyester. (A more in-depth discussion of green polymer synthesis is presented in Chapter 30.) Draw the structure of PLA.Draw (by hand) the monomers used to synthesize poly(ethyl cyanoacrylate) and poly(octyl cyanoacrylate), and chemical structure of the repeat units of each when polymerized.1. What are the different methods of preparing polymers? 2. Discuss each method with at least one example each showing the complete steps.