Acrylonitrile polymerized with DMF at 25C, with fecl3.h2o as catalyst and PPh3 as initiator Controlled or not and why(write the reason) Is it Broad or narrow Write the equation
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- In addition to their use in water treatment, ion-exchange resins are used to extract Au, Ag, and Pt ions from solution. Oneof the most common resins consists of a polymer with abenzene-containing backbone to which sulfonic acid groups(–SO₃H) are then added. (a) What monomer can be used toprepare the polymer backbone? (b) This polymer typically con-tains 4–16% crosslinking. Draw the structure of the benzene-containing monomer used to crosslink the polymer.What is the fraction of monomers (p) that have been used in a stepwise polymerisation reaction if the reaction solution started with a monomer concentration of 1.58 mol L-1 and now has a concentration of 0.231 mol L-1?(4) Describe the synthesis of plastic especially polyethylene, 1,1- dichloroethane, and polyvinyl chloride
- 6. Nylon-11 is poly(Ω-aminoundecanoic acid). In the polymerization of Ω-aminoundec-anoic acid, H2N(CH2)10COOH, to produce this polymer, what weight fraction of the reaction mixture will have the structure –[-NH–(CH2)10–CO-]100– when 99% of the functional groups have reacted ?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.The following condensation polymerization using 1.00 mol of diacid (limiting reactant) and a slight excess of diamine gave Nylonx.x. O H₂N(CH₂)6NH2 HOC(CH2) COH ??? mol (iii) + 1.00 mol Write the numbers in Nylonx.y. Degree of polymerization at p value of 0.995 was found to be 91. Then find out the value of 'r, and mol of diamine used. Keeping in mind that you used excess diamine, write down the structure of the polymer End group-[AB] End group n
- High density polyethylene (HDPE) and low density (LDPE) both are made from the same monomer (-CH2-)a one is transparent in appearance and one is whitish in colour. Identify which polymer has the transparent characteristic and which has the whitish colour and explain why such behavior is observed.(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.During our lectures on polymeric materials, I used polyethylene as an example because of its very straightforward structure. (a.) Hydrogen peroxide (H2O2) is used as an initiator for the polymerization of ethylene. Draw a diagram of a dissociated hydrogen peroxide molecule which emphasizes the creation of two free radicals (unbonded electrons) that can serve as initiators or as terminators of polymerization.
- synthetic polymers: Draw AIBN + heat or light.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(a) Which of the following polymers (i) – (vi) exist in different stereochemical forms? Draw polymer structures of all the stereoregular forms that are possible for each of the polymers. (i) polyethylene (ii) poly(1-butene) (iii) poly(2-methylpropene) (polyisobutylene) (iv) poly(vinyl fluoride) (v) poly(vinylidine fluoride) (vi) poly(1,3-pentadiene) (b) Explain why high molecular weight polypropylene is optically inactive, despite having an asymmetric center at every other carbon atom, while in contrast, poly(propylene oxide) is optically active.