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882 Macromolecules, Structure
FIGURE 25 The 50.3-MHz 13 C spectra of (a) cis-1,4-polyisoprene and (b) trans-1,4-polyisoprene observed in 10%
(w/v) solution in deuterobenzene at 60 C.
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The composition of copolymers of vinyl and diene monomers involved. The relationship between instanta-
monomers is not in general the same as that of the neous copolymer composition and monomer feed compo-
monomermixturesfromwhichtheyareformedandcannot sition (i.e., the starting ratio of monomers) is given by the
be deduced from the homopolymerization rates of the differential equation
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FIGURE 26 The 50.3-MHz 13 C spectrum of free-radical polybutadiene, observed at 50 C in 20% (w/v) CDCl 3 solution:
(a) olefinic carbons, (b) aliphatic carbons, and (c) computer simulation of (b) (see text).
