Macromolecules
Article
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CONCLUSIONS
■
α,ω-Diglycidyl ether monomers in which the two epoxide
groups are separated by multiple ethyleneoxy or propyleneoxy
units possess the ability to form in situ supramolecular
complexes with hydronium ions derived from strong protonic
acids. Because of the stability of these complexes, the cationic
ring-opening polymerization of the epoxide groups is sup-
pressed. The suppression is manifested as an induction period.
However, since such supramolecular complexes possess a low
threshold for dissociation, once polymerization begins, it
proceeds rapidly as a highly exothermic process. Similarly,
crown ethers form supramolecular complexes with hydronium
ions derived from Brønsted acids and we have demonstrated in
this article that when these complexes are added to epoxide
monomers rapid cationic polymerization ensues. Further, the
addition of crown ethers to highly reactive epoxide monomers
significantly modifies their reaction profiles in both thermally
and photochemically initiated cationic ring-opening polymer-
izations.
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AUTHOR INFORMATION
Notes
The authors declare no competing financial interest.
■
Supramolecular Chemistry 3; Royal Society of Chemistry: Cambridge,
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dx.doi.org/10.1021/ma202618r | Macromolecules 2012, 45, 2233−2241