期刊
POLYMER CHEMISTRY
卷 3, 期 11, 页码 3084-3092出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2py20265d
关键词
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资金
- DFG [BI 1337/7-1, BI 1337/8-1, SPP 1568 (H01160367), INST 271/249-1, INST 271/247-1, INST 271/248-1]
- Focus Area NanoScale at FU Berlin
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 similar to 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.
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