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Issue 11, 2012
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Dynamic supramolecular poly(isobutylene)s for self-healing materials

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Abstract

Mono- and bifunctional supramolecular poly(isobutylene)s (PIBs) bearing hydrogen-bonding motifs (barbituric acid or a Hamilton wedge) are prepared by a combination of living carbocationic polymerization (LCCP) and azide–alkyne “click” reactions to investigate their dynamics and self-healing behaviour. Barbituric acid (7) or Hamilton wedge (8) functionalized polymers (3a–c, 4a–d, 5a–c, 6a) with molecular weights of ∼3000 up to 30 000 g mol−1 exhibit complete end group transformation as proven by NMR and MALDI methods. Temperature-dependent rheology in the melt reveals thermoreversible formation of supramolecular clusters. Stoichiometric mixing of the polymers by solution blending affects the extent of clustering by specifically interacting barbituric acid/Hamilton wedge moieties. Frequency-dependent measurements on bifunctional barbituric acid functionalized PIBs reveal a strong rubbery plateau and terminal flow, caused by the formation of dynamically bridged clusters. In addition, fluorescence recovery after photobleaching (FRAP) measurements on the same supramolecular polymers reveal a multitude of different chain dynamics. Small discs of these polymers show self-healing at room temperature after being cut and brought into contact at the fractured surface.

Graphical abstract: Dynamic supramolecular poly(isobutylene)s for self-healing materials

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Article information


Submitted
25 Apr 2012
Accepted
25 May 2012
First published
25 May 2012

Polym. Chem., 2012,3, 3084-3092
Article type
Paper

Dynamic supramolecular poly(isobutylene)s for self-healing materials

F. Herbst, S. Seiffert and W. H. Binder, Polym. Chem., 2012, 3, 3084
DOI: 10.1039/C2PY20265D

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