Abstract
The application of selective ozonolysis together with high-resolution g.p.c. was performed to determine the crystalline stem lengths, in monomer units, of chain-folded lamellar crystals for trans and cis polyisoprene and polybutadiene. The trans polymer crystals were crystallized at −20°C in hexane directly from the dissolution temperature of 60°C, while the cis polymer crystals were crystallized by the same method at −70°C. The stem lengths of the trans- and cis-1,4-polyisoprene crystals were found to be 11 and 10 monomer units, respectively. Those for trans- and cis-1,4-polybutadiene crystals were found to be 12 and 13 monomer units, respectively.
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