Draw a section of the chain (four or five repeating units) of each of the following head-to-tail polymers: (a) syndiotactic poly(vinyl alcohol) (b) isotactic poly(a-methylstyrene) (c) atactic 1,2-polybutadiene (d) syndiotactic poly(1,2-difluoroethylene)
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- Write an equation for the formation of the following polymers.(a) Polystyrene, from styrene (C6H5CH=CH2)(b) PET (polyethylene terephthalate), from ethylene glycol and terephthalic acidIn natural rubber or polyisoprene, the trans isomer leads to a higher degree of crystallinity and density than the cis isomer of the same polymer, because(a) it is more symmetrical and regular.(b) it is less symmetrical.(c) it is irregular.into the book. Write a concise definition of each, using examples as appropriate.
- 1. Answer the following questions: (a) Why is free radical polymerization more commonly used today than ionic polymerization? (b) Almost all substituted ethylene monomers of commercial importance have the structure of CH2 = CHR or CH2 = CRR’ (where R or R' represent identical or different substituent groups). Why? (c) What are some methods for the production of conductive polymers? Give a few examples.(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 5(a) Draw the structure of polystyrene, which is formed by polymerizing the monomer styrene, C6H5CH=CH2.
- (a) Draw the structure of polystyrene, the chapter-opening molecule, which is formed by polymerizing the monomer styrene, C6H5CH = CH2. (b) What monomer is used to form poly(vinyl acetate), a polymer used in paints and adhesives?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 CIOCC6H4COCIThe monomer glycine (NH2-CH2-COOH) can undergo condensation polymerization to form polyglycine, in which the structural units are joined by amide linkages.(a) What molecule is split off in the formation of polyglycine?(b) Draw the structure of the repeat unit in polyglycine.
- 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?3. Dacron is the brand name for the polymer that is made from ethane-1,2-diol and benzene-1,4-dicarboxylic acid. (a) What type of polymer is Dacron? (b) When the two monomers combine, what type of reaction do they undergo and what molecule is eliminated? (c) What is the name for the linkages that join the monomers together?(d) Draw the monomers and the polymer of the reaction to create Dacron. (Use a condensed structural formula in your answer.) HC-C styrene H-O-C- ethane-1,2-diol I H OH НО. 206 H -C-0-H H benzene-1.4-dicarboxylic acid.Which of the following three compounds:- polyethylene [essentially no vapor pressure at 1 atm]- menthone [medium vapor pressure at 1 atm]- benzoic acid [low vapor pressure at 1 atm]Is most likely to be amenable to purification by sublimation? Why