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- Define the Mechanism - Cationic Polymerization of CH2=CHZ ?Br CuBr/PMDETA For the atom transfer radical polymerization of the following monomer, i.) provide structure of a 2-mer with an active chain end in the dormant form and ii.) the product terminated with hydrogenn.Write the cationic polymerization mechanism for following reaction. n H₂SO4 ?
- In a free - radical polymerization of styrene in solution at 600C, carbon tetrabromide was used as a chain transfer agent. The initial concentrations of styrene and CBr4 were 1 mol/L and 0.01 mol/L, respectively. In 1 h, these concentrations dropped to 0.85 mol/L and 0.007 mol/L, respectively. What is the chain transfer constant CS for styrene/CBr4? (Neglect chain transfer to monomer, initiator, and solvent.)Polyurethanes can be made by the step growth polymerization based on the reaction between isocyanates (R-N=C=O) and alcohols. Predict the repeat unit and draw the reaction mechanism for the polymerization of 4,4'-methylenebis (phenylisocyanate) and ethylene glycol. O=C=N- -N=C=O 4,4'-methylenebis(phenylisocyanate) HO OH ethylene glycolExplain the Mechanism - Radical Polymerization of CH2=CHPh
- Styrene can autoinitiate free radical polymerization and form polystyrene in the absence of an initiator. At temperatures >100 °C, radicals form due to homolysis of the T bond in the vinyl group. In the study of this reaction, researchers have found 1,2-diphenylcyclobutane in samples of heated styrene. The following mechanism for the formation of 1,2-diphenylcyclobutane has been proposed: Step 1: Homolysis of the vinyl T bond in a styrene molecule Step 2: Homolysis of the vinyl T bond in a second styrene molecule Step 3: Tail-to-tail addition of the radicals from Steps 1 and 2 Step 4: Radical coupling of the diradical formed in Step 3 (a) Use curved arrow notation to show the steps in this mechanism. (b) Are the steps in this mechanism consistent with those for free radical polymerization? (c) Why is the use of an initiator such as benzoyl peroxide more efficient in the synthesis of polystyrene than autoinitiated polymerization?(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.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
- Write the mechanism of free radical polymerisation of the following reaction: Initiator: AIBN EGYN= H3C CH 3 H3C CH3 ·CEN Monomer: methyl methacrylate The mechanism should include: 1. Initiation of primary radical and activated monomer 2. Propagation - head-to-tail addition 3. Termination - combination and disproportination10) PCC H,CrO4 ? ?How many grams of H2O2 would be needed to yield 1 kg of a polypropylene, (C3H6 )n, with an average degree of polymerization of 700? (Assume that all H2O2 dissociates to OH groups that serve as terminals for the molecules.) Express your answer to three significant digits. ΑΣφ vec ? The mass of H2O2 needed would be g.