Propose a mechanism for reaction of the first three propylene units in the polymerization of propylene in the presence of a peroxide. n H₂C=CHCH3 propylene ROOR high pressure H H C-C H CH3 n polypropylene
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- 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 BrWhich of the following pairs of compounds can be used directly for the synthesis of a step-growth polymer? The following pair of compounds: 0 NH₂ CI H₂N h O The following pair of compounds: NH₂ НО H₂N The following pair of compounds The following pair of compounds: ОН НО O The following pair of compounds H H НО. НО CI OH OH ОНPolyurethanes 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 glycol
- 3. Which of the following could be polymerized by cationic or anionic chain polymerization(or both or neither)? CN Ph он co,CH, Do11-15. The reaction below is an example of condensation polymerization of PET. Fill in the missing com- pound to complete the structure. - C,H,- + - CH,-0-H H- ноосс, н, соон Terephthalic acid HOC,H,OH Ethane-1,2-diol (A dicarboxylic acid) (A diol) Condensation polymerisation Ester link - C,H, + но fom Repeating unit of a polyesterWhat polymer is formed in each of the following reactions? Draw each polymer in polymer notation.n →> Catalyst Part B CH₂ Catalyst n CH H* 12D EXP. CONT. Marvin JS by ChemAxon A # H с N S CI Br - PF
- >1,3-Cyclopentadiene undergoes thermal polymerization to yield a polymer that has no double bonds in the chain. Upon strong heating, the polymer breaks down to regenerate cyclopentadiene. Propose a structure for the polymer.Thermosetting resins similar to Bakelite have also been prepared from renewable feedstocks. One method uses cardinol, the major constituent of the liquid obtained from roasted cashew nutshells. What polymer is obtained when cardinol is treated with formaldehyde (H2C=O) in the presence of a proton source?Cationic polymerization of 3-phenylpropene (CH2 = CHCH2Ph) affords A as the major product rather than B. Draw a stepwise mechanism to account for this observation.