Grubb's catalyst ROMP (d) Demonstrate that the polymerization of propene with a simple Cp2ZrCl₂ catalyst would give rise to atactic polypropylene
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- (b) Draw the structures of the polymers obtained from the followng monomers and name the polymerisation process in each case. H H H CH3 4 1 3 NH2 H2N 53. Draw the repeating unit for the condensation polymer formed from the following monomers: (a) C,H;CH(NH2)COOH (b) H2N(CH2);COOH (c) H2N(CH2)6NH2 and (d) CH2OHCH2OH and HOOCC6H&COOH CIOCC6H4COCIIn addition to their use in water treatment, ion-exchange resins are used to extract Au, Ag, and Pt ions from solution. Oneof the most common resins consists of a polymer with abenzene-containing backbone to which sulfonic acid groups(–SO₃H) are then added. (a) What monomer can be used toprepare the polymer backbone? (b) This polymer typically con-tains 4–16% crosslinking. Draw the structure of the benzene-containing monomer used to crosslink the polymer.
- Teflon is a polymer formed by the polymerization ofF2C“CF2. (a) Draw the structure of a section of this polymer.(b) What type of polymerization reaction is requiredto form Teflon?The ε-caprolactone monomer from which the biopolymer polycaprolactone (PCL) is synthesized is depicted below. (a) What is the monomer's function? (b) What is the polymerization mechanism that results in the formation of PCL? (c) Define/Illustrate the homopolymer's repeating unit provided that the functional group is placed at the hydrocarbon chain's terminal position.Proteins are naturally occurring polymers formed by condensationreactions of amino acids, which have the generalstructureIn this structure, ¬R represents ¬H, ¬CH3, or anothergroup of atoms; there are 20 different natural amino acids,and each has one of 20 different R groups. (a) Draw the generalstructure of a protein formed by condensation polymerizationof the generic amino acid shown here. (b) When only afew amino acids react to make a chain, the product is called a“peptide” rather than a protein; only when there are 50 aminoacids or more in the chain would the molecule be called a protein.For three amino acids (distinguished by having three differentR groups, R1, R2, and R3), draw the peptide that resultsfrom their condensation reactions. (c) The order in which theR groups exist in a peptide or protein has a huge influence onits biological activity. To distinguish different peptides andproteins, chemists call the first amino acid the one at the “Nterminus” and the last one the one at…
- During our lectures on polymeric materials, I used polyethylene as an example because of its very straightforward structure. (a.) Hydrogen peroxide (H2O2) is used as an initiator for the polymerization of ethylene. Draw a diagram of a dissociated hydrogen peroxide molecule which emphasizes the creation of two free radicals (unbonded electrons) that can serve as initiators or as terminators of polymerization.High density polyethylene (HDPE) and low density (LDPE) both are made from the same monomer (-CH2-)a one is transparent in appearance and one is whitish in colour. Identify which polymer has the transparent characteristic and which has the whitish colour and explain why such behavior is observed.Draw the structures of the polymers obtained from the following monomers and name the polymerisation process in each case. (i) CI H₂N O (iv) (ii) CI NH₂ HO LOH (iii) охо (v)
- Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene. Poiypropylene belongs to the group of polyolefins and is partialy crystalline and non-polar. CH, -CH,CH-CH,CH–CH,CH-CH,CH-CH,CH-CH,CH- ÇH, ÇH, CH, CH, Draw the syndiotactic and isotactic forms of PP.(d) Propene can polymerize to form poly(propene). (i) State, with a reason, the atom economy for this reaction. (ii) Draw a section of this polymer, showing two repeat units.A hydrocarbon (Alkene) is used as a monomer to prepare a chain-growth polymer with molecular weight of 104000 g / gmole. If the degree of polymerization is 2476, the polymer type is:
