Organic Polymer Chemistry
A 20.0 sample of polyester, synthesized by reacting terephthalic acid and ethylene
glycol: 1/1 mole ratio, was found to contain 2.95 10³ moles of carboxylic acid groups
by titration with base.
(a) What the number average molecular weight of the polymer?
(b) Estimate the extent of reaction that was required in order to attain this molecular
(c) Draw the structure of the polymer, clearly showing the repeating unit and the end
What factors determine whether cyclization or linear polymerization is the predominant
reaction in step growth polymerization? Discuss the possibility of cyclization in the
polymerization of the monomers shown in (a) and (b) below, when has values of 2- 10.
At what stage or stages in the polymerizations is cyclization possible?
(b) HO-(CH2)2-OH HOOC-(CH2COOH
Show by means of chemical equations the initial reaction product or products of the
reaction of propagating poly(methyl acrylate) radicals with each the following
(b) isopropyl benzene
(c) 2,6-di-tert-buty Iphenol
(d) di-tert-buty peroxide
(e) carbon tetrabromide
(h) Allyl acetate
Classify each of the compounds (a h) as either chain transfer agent or an inhibitor and
explain your choice.
The sodium naphthalenide polymerization of styrene is carried out in benzene and
tetrahydrofurar solutions. Which solution gives the higher polymerization rate? Discuss
the effect of solvent on the relative concentrations of the different types of propagating
What reaction conditions determine the relative amounts of 1,2-, cis 1,4-, and trans 1,4
polymerization in radical and anionic polymerizations of 1,3 -butadiene? Indicate the
effect of solvent and counterion in these polymerizations. What polymer structures
obtained using traditional Ziegler-Natta and Metallocene catalysts?
Which the polymerization initiator or initiators can be used to polymerize each of the
monomers (a-h) listed in the table below' (Note: an initiator may be suitable for more
than one monomer). For each of the monomers, draw the structure of the polymer
repeating unit that obtained.
(a) Propylene oxide
TiCla + Et2AICI
Describe with the aid of chemical reaction schemes how you would synthesize block
copolymers with segments of the structures shown in (a) and (b):
(a) tonging and Hot
(b) 3-mm and
What methods can be used to increase the polymerization rates in free radical initiated
polymerizations? Discuss the impact that each method has on molecular weight of the
Compare and contrast the cationic ring- opening polymerization of the three member
hetrocyclic monomers ethylene oxide and aziridine. Draw structures of polymers
obtained and explain why the polymers from these monomers have different chain
A sample of polystyrene, prepared by the living anionic polymerization of styrene with n-
butyllithium as an initiator, was found to have number average molecular weight of
104.000 100% g/mole complete, and what molar are: mass (a) dispersity the relative of initial 1.04. concentrations Assuming the conversion of monomer of and styrene
initiator required to achieve this molecular weight; and (b) the weight average molecular
weight of the sample?
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