Plasticization of a Semicrystalline Metallosupramolecular Polymer Network

Franziska Marx, Subhajit Pal, Julien Sautaux, Nazim Pallab, Grégory Stoclet, Christoph Weder, Stephen Schrettl

Research output: Contribution to journalArticlepeer-review

Abstract

The assembly of ligand-functionalized (macro)monomers with suitable metal ions affords metallosupramolecular polymers (MSPs). On account of the reversible and dynamic nature of the metal-ligand complexes, these materials can be temporarily (dis-)assembled upon exposure to a suitable stimulus, and this effect can be exploited to heal damaged samples, to facilitate processing and recycling, or to enable reversible adhesion. We here report on the plasticization of a semicrystalline, stimuli-responsive MSP network that was assembled by combining a low-molecular-weight building block carrying three 2,6-bis(1′-methylbenzimidazolyl) pyridine (Mebip) ligands and zinc bis(trifluoromethylsulfonyl)imide (Zn(NTf2)2). The pristine material exhibits high melting (Tm = 230 °C) and glass transition (Tg ≈ 157 °C) temperatures and offers robust mechanical properties between these temperatures. We show that this regime can be substantially extended through plasticization. To achieve this, the MSP network was blended with diisodecyl phthalate. The weight fraction of this plasticizer was systematically varied, and the thermal and mechanical properties of the resulting materials were investigated. We show that the Tg can be lowered by more than 60 °C and the toughness above the Tg is considerably increased.

Original languageEnglish
Pages (from-to)132-140
Number of pages9
JournalACS Polymers Au
Volume3
Issue number1
DOIs
StatePublished - 8 Feb 2023

Keywords

  • debonding on demand
  • glass transition temperature
  • mechanical properties
  • metal−ligand complexes
  • plasticization
  • stimuli-responsive polymers
  • supramolecular polymers

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