Two samples of polystyrene, samples A and B, were synthesised. A from the addition of n- butyl lithium to styrene in THF under a nitrogen atmosphere, and B from the addition of benzoyl peroxide to styrene under a nitrogen atmosphere respectively. 1. Of the two polymers produced (A and B) one had Ma = 12,000 and a polydispersity of 1.1 and one a Ma=11, 200 and a polydispersity of 1.7. Identify which set of molecular weight parameters corresponds to which polystyrene sample.
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- In a non-acid catalyzed step-growth polymerization between A-A and B-B monomers, the A groups are titratable by aqueous base (1 N) and [A-A] [B-B) = 6 mol.kg-1. a) What is the DP if it takes 100 mL of base to neutralize the reaction mixture at 700 minutes of reaction time (assuming the initial total weight 500 g)?...Give a single benefit for each polymerisation from carrying them out under a nitrogen atmosphere? (d) Of the two polymers produced (A and B) one had Mn = 12,000 and a polydispersity of 1.1 and one a Mn = 11, 200 and a polydispersity of 1.7. Identify which set of molecular weight parameters corresponds to which polystyrene sample.(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.
- Finding Molecular Weights from Experimental Data a. Endgroup analysis by titration: 9.8 mols of 1,6-hexanediamine were reacted with 9.8 mols of adipic acid. After the reaction, a titration was performed using KOH. If exactly 65 mL of 5 M KOH were used to neutralize the residual –COOH groups, what is the number average molecular weight of the polymer?Calculate the number-average degree of polymerization of an equimolar mixture of adipic acid and hexamethylene diamine for the reaction conversion of 0.500, 0.800,0.900, 0.950, 0.970, 0.099, 0.995.(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) (ii) (iii) (iv) (v) (vi) polyethylene poly(1-butene) poly(2-methylpropene) (polyisobutylene) poly(vinyl fluoride) poly(vinylidine fluoride) poly(1,3-pentadiene) 3 (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.
- Which are true for polarography? Polarography is amperometry conducted with a dropping Hg electrode. The diffusion current in the plateau region of the polarographic wave is proportional to the concentration of the analyte and is used for quantitative analysis. III The half-wave potential for maximum current is characteristic of a given analyte in a given medium and can be used for qualitative analysis for the analyte. IV Fresh Hg drops give reproducible results. V Polarography is used to primarily to study oxidations Hg may reduce when studying reductions. O II, IV, and V O II, III, and V O II, III, and IV O l and V O I, III, and IV0.9583 g of sample was dissolved in 80 mL of xylene and extracted with three 15 mL quantities of water. The combined aqueous extracts were diluted to 50.0 mL and then shaken with 10 mL toluene. The toluene was then discarded. The absorbance of the aqueous solution when measured in a 1cm path length cell was 0.134 at 278 nm.Calculate the free chlorampenicol content of the sample in ppm, given A(1%, 1cm) = 298 at 278 nm.The thiourea in a 1.455-g sample of organic material was extracted into a dilute H2SO4 solution and titrated with 37.31 mL of 0.009372 M Hg2+ via the reaction. Calculate the percent (NH2)2CS (76.12 g/mol) in the sample. 4 (NH2)2CS + Hg2+ → [(NH2)2CS]4Hg2+
- You have 3 compounds (A, B, C) in your samples. Their polarity A > B > C. You want to separate these compounds using a HPLC equipment. You also want to collect A firstly. Which of the following condition is the best? Octadecyl-modified silica as the stationary phase and hexane as the mobile phase. Octadecyl-modified silica as the stationary phase and acetone as the mobile phase. Nitriles-modified silica as the stationary phase and water as the mobile phase. Nitriles-modified silica as the stationary phase and pentane as the mobile phase.How did you obtain the required reaction of K2Cr2O7 + 6CrSO4 + 7H2SO4→ 4Cr2(SO4)3 + K2SO4 + 7H2O?Using AIBN as the initiator, illustrate the mechanism of free radical polymerization that produces polyvinyl chloride (Use coupling of two tetramers to show the termination step) 2. Use peroxidation of oleic acid to describe the propagation stage of peroxidation reaction