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- 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] 1.3Chemistry ⒸF|C2022W/CHEN154 WS 0 Q Sch ш ш модними AB HO. Student ID: 12. Good question. Which of the following monomers (A or B) produces a polymer with the highest melting point? Briefly explain your reasoning. Assume the molecular weight of the resulting polymer is the same. OH H₂N. y new H. Inv OH antep CNC 91 © bove mA 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:
- (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.For the following monomer or polymer molecules below, identify whether synthes will more likely involve addition polymerization reaction or condensation polymerization reaction: NOTE: Your answers must be in CAPITAL LETTERS ONLY. EX. POLYMERIZATION MONOMER/POLYMER POLYMERIZATION REACTION . CH2=CH-C=N CH2=CH-CI он OH TYL NH2-CH2-COOH+ H2N-CO-(CH2)2- CH(NH2)-COOH HHHH HHHHH -C-C-C- -C -C-C-C- H H H H HH H H H HPolymers prepared by condensation polymerization are usually of high molecular weights, but the student has been finding difficulties to produce a high molecular weight polymer using this technique in the lab. Give two reasons why this might be the case.
- 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?-(CH2 -(CH) One or more of the monomers below are needed to make the polymer Choose which one(s). но но (CH2)4 NH2- -(CH2)6-NH2 H H. H- •C он OH H H. H H.What is the basic mechanism of an Anionic polymer (acrylic acid based as carbomers) in regards to function and “activation”? How do they work and thicken?
- Draw the curved arrow mechanism for the initiation step in cationic polymerization when methoxyethene reacts with BCI3 H₂O. Include unshared electrons and any nonzero formal charges. You do not need to show additional resonance forms. TA i Draw the curved arrow mechanism for the initiation step of this polymerization reaction. □ AN :CI: ‒‒‒‒‒‒‒ i 12D : CI: :CI—B :CI: + I H C N O S F P Cl BrThe 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 nBelow are the reaction steps in a certain polymerization process, 22. which may occur by either an uncatalyzed or an acid-catalyzed pathway. 0–H R-C-o–H k1 + HA R-C+ A- k2 0–H Group 1 0–H 0–H k3 R-ċ+ A- + R'+o-H R—С—0—Н k4 0–H R-ó+ A- Group 2 H 0–H R–Ċ–0–H k5 R-C-0–R' + H-0 + НА A- Group 3 H Write a balanced chemical reaction for the overall process. RCOOH + HA + RCOOH2+ + A- + R'OH + RC(OH)2(R'OH)+ ® RCOOH2+ + RC(OH)2(R'OH)+ + RCOOR' + H2O + HA. RCOOH + R'OH 2 RCOOR' RCOOH + R'OH E RCOOR' + H20 RCOOH + HA 2 RCOOH2+ + A- RCOOH + R'OH + HA E RCOOR' + H2O + HA