A dual crosslinked self-healing system

Autor(en)

Diana Döhler, Herwig Peterlik, Wolfgang H. Binder

Abstrakt

Restoration of large volume damage together with mechanical stability of self-healing polymers requires fast and efficient reversible crosslinking processes together with the presence of a static network. We investigate four-arm star polymers as a dual self-healing material, equipped with hydrogen bonding moieties and azide endgroups applicable for crosslinking based on “click” cycloaddition reaction (CuAAC). The concepts takes advantage of additional supramolecular network formation due to supramolecular cluster formation. To this effect four-arm star poly(isobutylene)s were prepared via living carbocationic polymerization (LCCP) in combination with simple endgroup transformation steps and microwave-assisted click-chemistry to introduce thymine moieties as supramolecular tie points. Four-arm star thymine-telechelic PIB was obtained as a tough rubbery material as proven via melt-rheology and SAXS measurements with clusters of ≈10 hydrogen bonding moieties resulting in a self-healing response at room temperature. To enable the design of a doubly crosslinked self-healing system, four-arm star PIBs bearing an average of 1.7 azide groups and 2.3 thymine endgroups/polymer were crosslinked with a three-arm star alkyne-telechelic PIB. A weakly crosslinked covalent network reinforced by supramolecular hydrogen bonding interactions was obtained in which “click”-crosslinking reduces the number of clustered hydrogen bonds from ≈10 to ≈8. Macroscopic self-healing studies of the double covalent and supramolecular network structure revealed fast and multiple self-healing at 20 °C within 24 h. The now designable four-arm star polymers enabled the design of a highly efficient self-healing system based on double network formation due to “click”-crosslinking and supramolecular cluster formation.

Organisation(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

Martin-Luther-Universität Halle-Wittenberg

Journal

Polymer

Band

69

Seiten

264-273

Anzahl der Seiten

10

ISSN

0032-3861

DOI

https://doi.org/10.1016/j.polymer.2015.01.073

Publikationsdatum

07-2015

Peer-reviewed

Ja

ÖFOS 2012

103023 Polymerphysik

Schlagwörter

ASJC Scopus Sachgebiete

Materials Chemistry, Polymers and Plastics, Organic Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/a-dual-crosslinked-selfhealing-system(48ca504b-ce6d-47d8-a0a7-9147722532eb).html