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- (a) Draw the structure of the prepolymer A formed from 1,4-dihydroxybenzene and excess epichlorohydrin. (b) Draw the structure of the cross-linked polymer B formed when A is treated with H2NCH2CH2CH2NH2 as the hardening agent.Explain the mechanism of metathesis polymerization.a) Draw the structure of the prepolymer A formed from 1,4 dihydroxybenzene and excess epichlorohydrin. (b) Draw the structure of the cross-linked polymer B formed when A is treated with H2NCH2CH2CH2NH2 as the hardening agent.
- (4) Polybenzimidazoles are made by a two-stage step-growth melt polymerization: H2N- - NH2 -H20 H2N NH2 -фон What extent of reaction is needed to produce n = 200 in the above formula? Carry four decimal places in your answer.6. Nylon 6 is commercially produced via the hydrolytic polymerization of E-caprolactam (azepan-2-one). The mechanism can occur via chain-growth and step-growth mechanisms. Draw these two mechanisms and explain which is expected to predominate.What is the degree of polymerization of each of the following polymers with molar mass 100,000 g/mol ? (a) polyacrylonitrile (b) polycaprolactam (c) poly(trimethylene ethylene-urethane) [Ans. (a) 1887; (b) 885; (c) 532] 1.3
- Cationic polymerization of 3-phenylpropene (CH2 = CHCH2Ph) affords A as the major product rather than B. Draw a stepwise mechanism to account for this observation.(a) Draw the structure of the prepolymer A formed from 1,4-dihydroxybenzene and excess epichlorohydrin. (b) Draw the structure of the cross-linked polymer B formed when A is treated with H2NCH2CH2CH2NH2 as the hardening agent.A sample of methacrylate (CH2=CHCOOCH3) is polymerized, the resulting polymer has a degree of polymerization of 1000. Draw the structure for the repeating unit of the polymer and calculate the polymer's molecular weigh:
- Identify the repeating unit in the polymer formed from the following reaction sequence. C=C-O-C=O ---->1] Benzoyl peroxide 2] NaOH, H2O, heat | C *The hanging carbon is attached to carbon above it, with the oxygen double bond. I know that the answer should be a repeating sequence of two carbons with an -OH hanging off them but i dont follow the mechanism. Sorry for the confusing molecule structure, there isnt a good way to draw on this platform.(a) Hard contact lenses, which first became popular in the 1960s, were made by polymerizing methyl methacrylate [CH2 = C(CH3)CO2CH3] to form poly(methyl methacrylate) (PMMA). Draw the structure of PMMA. (b) More comfortable softer contact lenses introduced in the 1970s were made by polymerizing hydroxyethyl methacrylate [CH2 = C(CH3)CO2CH2CH2OH] to form poly(hydroxyethyl methacrylate) (poly-HEMA). Draw the structure of poly-HEMA. Since neither polymer allows oxygen from the air to pass through to the retina, newer contact lenses that are both comfortable and oxygen-permeable have now been developed.Write chemical reactions illustrating a polymerization mechanism involving the monomers listed below. Would the reactions be considered step growth or chain growth? Explain and support
