Which polymer in each of the following pairs would you expect to exhibit the higher glass transition temperature? Explain your choice in each case. (a) CH₂CH or CH₂CH (b) foo OCCH=CHC (c) CH₂CH₂NH] or CH₂CH₂O (d) or ΟΙ for -OCCH₂CH₂C toi Соснен COCH,CH₂O] CH2CH2CH3 or COCH₂CH₂O CH(CH3)2
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- 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…3. 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 CIOCC6H4COCIUsing each of the following polymers, (a) (b) ... (c) H H H H H C C C=0c=0c=0 H CH2 CH, CH2 H;C H3C H3C (i) Draw the condensed formula for the polymer. (ii) Propose a structure for the monomer from which the polymer was synthesized. I-
- Polymer PXX has a glass transition temperature of 49°C. Describe the molecular conformation and arrangement of this polymer[8] Which monomer would most easily undergo cationic polymerization? CN II II H. NH, IV V (A) I (B) П (С) Ш (D) IV (E) VIn copolymers made of ethylene and vinyl acetate monomers, melting point anddegree of crystallinity decrease as the percentage of vinyl acetate increases.Suggest an explanation.
- Write the repeating units expected from the following polymerization reactions: (c) O= -O+HOCH₂CH₂OCH₂CH₂OHd) Provide the structure for the chain end group X that would result from chain termination through the following termination mechanism: • Disproportionation: Structure of X = • Chain end radical recombination: Structure of X = • Hydrogen abstraction: Structure of X = d) Early in the polymerization at lower conversion of the MVK monomer, the polymer chains formed are primarily linear. However, close to the end of the reaction, as most of the monomer is consumed, branched polymers may start to appear. Propose a possible rationale for the formation of branched polymer structures (hint: consider the types of termination reactions that may compete with polymerization when only little monomer is still present). 32 linear vs. branchedWhat 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] 1.3
- Which polymer below is the same as this? H 'N' in A) B) C) D) N’ H un up ZILinear polyethylene; lightly branched isotactic polypropylene State whether it is possible to determine whether one polymer is more likely to crystallize than the other. If it is possible, note which is the more likely and then cite reason(s) for your choice. If it is not possible to decide, state why.Identify and draw structures representing the different stereoregular forms of the polymers that are possible in the chain polymerization of the following monomers: LOCH3 ÓCH, (a) (b) (c)