• What do you mean by auto-acceleration? • List down the factors that affect the cationic polymerization. Fill in: Unlike free radical polymerization, the termination in cationic polymerization occurs by -----. • In cationic polymerization, Dp increases with ---- in polarity, ---- in T and ---- in acidity.
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- Radical polymerization of styrene gives a linear polymer. Radical polymerization of a mixture of styrene and 1,4-divinylbenzene gives a cross-linked network polymer of the type shown in Figure 29.1. Show by drawing structural formulas how incorporation of a few percent of 1,4-divinylbenzene in the polymerization mixture gives a cross-linked polymer.Monomers/initators used in free radical polymerization i) What monomer can be used with benzoyl peroxide and under what conditions? ii) What monomer can be used with di-tert-butyl peroxide and under what conditions? iii) What monomer can be used with hydrogen peroxide and under what condition?Addition (chain-growth) polymerization reactions often terminate by combination or disproportionation. However, there is another class of deactivation reactions, called chain transfer reactions, which are usually relevant to the final degree of polymerization (dp). How might you expect the dp of a polymerization reaction deactivated by chain transfer compare/contrast with polymerizations terminated by combination or disproportionation?
- This polymer is composed of 2 monomer units: an acid chloride and an amine. In the box below, draw the structure of both monomers. flands (CH₂)6- -85 I.. H ChemDoodle • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate structures with + signs from the drop-down menu. -CH₂ On Sn [F < ZI 22 S6. 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 ?2. In free radical polymerization, the polymerization of CH,CH-CHOCOCH(allyl acetate) is very slow whereas that of CH, =CH-CD,OCOCH, is fast. Explain the reason,
- 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 nFor 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 HThis polymer is composed of 2 monomer units: an acid chloride and an amine. In the box below, draw the structure of both monomers. (8-10 C (CH₂)6-C CH₂ 어 H n • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate structures with + signs from the drop-down menu.
- a) What is the functionality of TMP and AA, respectively b)i if you start with 2 mol of TMP and 3 mol of AA, will you be running into a risk forming a cross-linked polyester during polymerization, and why?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] 1.3What is the first step in the cationic polymerization of alkenes?