Dynamic covalent macrocyclic poly(phthalaldehyde)s: Scrambling cyclic homopolymer mixtures produces multi-block and random cyclic copolymers

Joshua A. Kaitz, Charles E. Diesendruck, Jeffrey S. Moore

Research output: Contribution to journalArticle

Abstract

We recently reported the cationic polymerization of o-phthalaldehyde to macrocyclic poly(phthalaldehyde) polymers. Resubjecting the cyclic polymers to the polymerization conditions led to a redistribution of the polymer to a new cyclic structure consistent with thermodynamic equilibrium. We now report the synthesis of cyclic poly(phthalaldehyde) derivatives and demonstrate the scrambling of distinct homopolymer mixtures to copolymers under the cationic polymerization conditions. Homopolymer mixtures are found to rapidly redistribute, first to multiblock cyclic copolymers. With extended reaction time, random macrocyclic copolymers are obtained. Evolution of the microstructure was monitored by NMR spectroscopy, MALDI-TOF mass spectrometry, and gel permeation chromatography (GPC). The reported scrambling method leads to the rapid preparation of macrocyclic copolymers of high molecular weight with variable microstructure depending on reaction times and catalyst loadings.

Original languageEnglish (US)
Pages (from-to)8121-8128
Number of pages8
JournalMacromolecules
Volume46
Issue number20
DOIs
StatePublished - Nov 1 2013

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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