Abstract
Inclusion polymerization of diene and vinyl monomers by using methyl cholate (MC) as a host was studied. The polymerization exhibited a number of behaviors characteristic of one-dimensional inclusion polymerization. For example, polymerizabilities of the monomers depended on their size and shape rather than their electronic properties. Another is that thermally stable propagating radicals were detected by ESR spectroscopy. These features resemble those observed in the case of deoxycholic acid (DCA) and apocholic acid (ACA). Consequently, it is considered that there exist one-dimensional molecular assemblies of the monomers in one-dimensional spaces at a molecular level, called channels. Crystallographic studies show that MC forms amphiphilic bilayered assembly. It is expected that sliding of the bilayers along the lipophilic side yields channels between the layers like the cases of cholic acid (CA), DCA, and ACA. Side pockets of the channels are slightly different in the size and shape among these hosts. The difference is closely related to slight differences of the polymerization behaviors among the hosts, called space effects.
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Goonewardena, W., Miyata, M. & Takemoto, K. One-Dimensional Inclusion Polymerization of Diene and Vinyl Monomers by Using Methyl Cholate as a Host. Polym J 25, 731–740 (1993). https://doi.org/10.1295/polymj.25.731
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DOI: https://doi.org/10.1295/polymj.25.731