Cited by 25Advanced Polymer Synthesis and CharacterizationSupramolecular Chemistry and ComplexesPhotopolymerization techniques and applications

Involvement of supramolecular complexes in the capture and release of protonic acids during the cationic ring-opening polymerization of epoxides

Ryu, C. Y., Spencer, M. J., Crivello, J. V.·2012·Macromolecules

Abstract

The kinetics of the cationic ring-opening polymerizations of epoxide monomers were controlled through the use of supramolecular proton complexes. α,ω-Diglycidyl oligoethylene oxides bearing multiple ethyleneoxy spacer groups form metastable supramolecular proton complexes with strong Brønsted acids generated either by the photolysis of onium salts or by their redox reactions with reducing agents. Trapping of the Brønsted acids by in situ complex formation results in a delay of the onset of cationic ring-opening. However, once polymerization begins, the epoxide groups of the monomer are very rapidly consumed resulting in characteristically highly exothermic autoaccelerated polymerization reactions. Crown ethers can also form supramolecular complexes with hydronium ions derived from the reaction of protonic acids with water and these complexes can be used to modify the kinetic behavior of the cationic ring-opening thermal and photopolymerizations of a variety of epoxide monomers. The ring size of a crown ether has a strong influence on the stability of the supramolecular complex formed, and this was shown to have a major impact on the kinetics of the cationic ring-opening polymerizations.

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Crossref · 10.1021/ma202618r

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  • CROP of epoxides and oxetanes via Brönsted acids are often characterized by an induction period.

    “The CROP of epoxides and oxetanes via Brönsted acids are often characterized by an induction period and, although not completely explained, the more recent studies of Crivello's group [48] modifying the kinetics of the photo initiated CROP by the addition of crown ethers (which are similar in structure to the oligomers formed in the early stages of polymerization) or 2,6 di-tert-butyl pyridine do”

    From Ring-Opening Polymerization—An Introductory Review (2013) · cites this paper as [48]

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Authors
Ryu, C. Y., Spencer, M. J., & Crivello, J. V.
Affiliations
Rensselaer Polytechnic Institute (US)
Corresponding author
Crivello, J. V.
Venue
Macromolecules
Published
2012-02-22
Volume
45
Issue
5
Pages
2233-2241
ISSN
  • 0024-9297 (ISSN-L)
  • 1520-5835
OpenAlex
W2330015625
Cited by
25
References
33
Citations by year
2024: 3 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 4 · 2019: 2 · 2018: 1 · 2016: 3 · 2015: 2 · 2013: 4 · 2012: 2
FWCI
1.18
Type
journal article
Language
en
Open access
closed
Locations
Macromolecules (publishedVersion)
Topics
  • Physical Sciences › Chemistry › Organic Chemistry › Advanced Polymer Synthesis and Characterization
  • Physical Sciences › Chemistry › Organic Chemistry › Supramolecular Chemistry and Complexes
  • Physical Sciences › Chemistry › Organic Chemistry › Photopolymerization techniques and applications
Keywords
cationic ring-opening polymerization, epoxides, Brønsted acid, onium salts, photolysis, redox reactions, exothermic polymerization, crown ethers, hydronium ion, polymerization kinetics, photopolymerization, thermal polymerization, ring size effects

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