(a)
Interpretation:
The portion of acrylonitrile polymer as a head to tail polymer needs to be sketched.
Concept introduction:
A polymer is a long chain consists of large number of monomer units. In a polymer, the monomers are linked to each other in a continuous or repetitive manner. These monomer units are linked to each other either through the formation of peptide linkage, glycosidic linkage or by removal of any moiety such as a water molecule. Polyvinyl chloride, Bakelite and polystyrene are some of the examples of the
(b)
Interpretation:
The portion of acrylonitrile polymer as a head to head and tail to tail polymer needs to be sketched.
Concept introduction:
A polymer is a long chain consists of large number of monomer units. In a polymer, the monomers are linked to each other in a continuous or repetitive manner. These monomer units are linked to each other either through the formation of peptide linkage, glycosidic linkage or by removal of any moiety such as a water molecule. Polyvinyl chloride, Bakelite and polystyrene are some of the examples of the polymers.
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Chapter 23 Solutions
Chemistry: Principles and Reactions
- Analysis of a sample of polyacrylonitrile shows that there are six lengths of chains, with the number of chains of each length shown in the table below. The molecular weight of the acrylonitrile monomer is 53 g/mol. Calculate the following: (a) The weight average molecular weight and degree of polymerization, (b) The number average molecular weight and degree of polymerization. Number Of chains Mean Molecular weight of chains (g/mol) 3010 10,005 18,005 17,005 15,005 6010 9010 12,010 9005 15,010 4005 18,010arrow_forwardDuring 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.arrow_forwardPoly(lactic acid) (PLA) has received much recent attention because the lactic acid monomer [CH3CH(OH)COOH] from which it is made can be obtained from carbohydrates rather than petroleum. This makes PLA a more “environmentally friendly” polyester. (A more in-depth discussion of green polymer synthesis is presented in Chapter 30.) Draw the structure of PLA.arrow_forward
- 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?arrow_forwardNovolac is the linear polymer which on heating with formaldehyde forms cross-linked bakelite. Write the structures of monomers and the polymer novolac.arrow_forwardPolymer: Poly(vinylidene chloride) Indicate whether the polymer is a natural polymer or synthetic polymer. Indicate whether the polymer is produced by condensation or addition polymerization. Give the structure of the monomer used to produce the polymer. Discuss how the polymer is produced, its chemical and physical properties, factors that effecting their properties and their major application.arrow_forward
- Poly(lactic acid) (PLA) has received much recent attention because the lactic acid monomer [CH3CH(OH)COOH] from which it is made can be obtained from carbohydrates rather than petroleum. This makes PLA a more “environmentally friendly” polyester. (A further discussion of green polymer synthesis is presented in Chapter 28.) Draw the structure of PLA.arrow_forward4. Describe how the stereoisomerism affect the degree of crystallinity of a semicrystalline polymer such as polyethylene.arrow_forward(d) A sample of head-to-tail polypropylene was found to have an average molar mass of 33,000. Ignoring the identity of the end groups, calculate the average degree of polymerization, n.arrow_forward
- what is polymer ? write classification of polymer ? write application of each type of polymerarrow_forwardPoly(vinyl alcohol), a hydrophilic polymer used in aqueous adhesives, is made by polymerizing vinyl acetate and then hydrolyzing the ester linkages. Give the structures of poly(vinyl acetate) and poly(vinyl alcohol)arrow_forward
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