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- (CH2) (CH) One or more of the monomers below are needed to make the polymer Choose which one(s). но- (CH2)4 O NH2-(CH2)6–NH2 CI O H H. CN9.) Which monomer could produce this polymer? CH- 9. Which monomer could produce this polymer? CH3 (B) (C) H3C (D) (A) [(CH3)2CH],NLi (LDA) CH3I 10. What would be the product of this reaction sequence? -78°C H3CO N[CH(CH3)2] LiO- (C) (B) (D) (A) CH3 H* Cl2 KMNO4 11. What is the product of this reaction? OH", heat CH;OH FeCl3 LOCH3 CO2H OCH3 Co,CH3 Co,CH3 (A) (B) (C) (D) CI CI Zn (Hg) Br2 12. What is the product of this reaction wequence? CI Br AICI3 AIBR3 HCL Br (A) Br (B) (D) (C) CH2Br(d) Another variation on this type of polymer is used in hair gels. In these, the polymer chains are cross-linked by a compound known as pentaerythritol. но- OH но- OH pentaerythritol ( By what type of chemicat reaction are the cross-links in this polymer formed? (i) it is important that the gel should be easily washed out of hair What is it about the structure of the polymer that allows this to happen?
- 1. Write the structure of the monomer(s) used to synthesize the following nonvinyl polymers. a) b) -NH· CH2 CH2 0 CH2 CH2 CH2 CH2 CH21 -NH- (10 points) (10 points) c) Which of the polymers is synthesized via addition polymerization? Which of the polymers is synthesized via condensation polymerization? (5 points) n d) If the Mɲ of the polymers given in part a and b are 40000 Da, what are their degree of polymerization (DP) values? (10 points)From any monomers you choose, Explain how the following polymers can be produced [Answer five only] 1- Polymer ues in Digital Disks (CDs, DVDs, ) 2- Alternating styrene-Butadiene rubber 3- Sponge polymer 4- Polymer used in the clothing, carpets and fishing line. 5- Crosslink polymer 6- Poylmer ues for Corrosion protection of offshore structures.NH2 Dry-erase boards, or whiteboards, in classrooms consist of a network polymer similar to Bakelite that is made from formaldehyde and melamine. (a) Propose a structure for the polymer formed. (b) Why is this type of polymer suitable for use in whiteboards? 'N. H2N `NH2 Melamine
- (CH2 (CH₂ n One or more of the monomers below are needed to make the polymer Choose which one(s). OH H H H H CH HO-(CH2)4--OH ONH2 H -(CH2)6-NH2 X H CIWhen certain cycloalkenes are used in metathesis reactions, ringopening metathesis polymerization (ROMP) occurs to form a highmolecular- weight polymer, as shown with cyclopentene as the starting material. The reaction is driven to completion by relief of strain in the cycloalkene.What products are formed by ring-opening metathesis polymerization of each alkene?List the following group of monomers in order of decreasing ability to undergo cationic polymerization.
- A3 Anionic polymerization of styrene is generally known to produce polymers with a narrow molecular weight distribution. Explain the reason for this.Question 4. Methylvinyl ketone (MVK) can undergo a polymerization reaction in the presence of AIBN initiator to produce a poly(methylvinyl ketone) polymer according to the scheme below. NEC H3C CH3 `N=N₂ CH3 CEN CH3 azobisisobutyronitrile (AIBN) CH3 methylvinyl ketone (MVK) heat CH3 H3C NEC n poly(methylvinyl ketone) a) Provide the mechanism for heat-induced decomposition of the AIBN initiator to produce a reactive radical species. CH3 NEC H3C `N = N heat CH3 CEN CH3 10 0-0 b) Provide a mechanism for the initiation step in the MVK polymerization reaction: c) Show the mechanism for the propagation step to form an MVK oligomer with n = 3: branched sidare tass xy ha etCH2 -CH2 -(CH -O- One or more of the monomers below are needed to make the polymer Choose which one(s). H H. H- -C- он он H H. H,N- NH2 но- (CH2)4 -O- H H H CH3 (Previous