Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 46, Pages 10946-10953Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201902273
Keywords
azobenzenes; isomerization; photochemistry; polymers; self-healing
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1681, AU 321/3]
- DFG [WU 787/2-1, WU 787/8-1]
- Thousand Talents Plan
- Fonds der Chemischen Industrie (FCI) [661548]
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Photoisomerization in some azobenzene-containing polymers (azopolymers) results in reversible solid-to-liquid transitions because trans- and cis-azopolymers have different glass transition temperatures. This property enables photoinduced healing and processing of azopolymers with high spatiotemporal resolution. However, a general lack of knowledge about the influence of the polymer structure on photoinduced reversible solid-to-liquid transitions hinders the design of such novel polymers. Herein, the synthesis and photoresponsive behavior of new azopolymers with different lengths of spacers between the polymer backbone and the azobenzene group on the side chain are reported. Azopolymers with no and 20 methylene spacers did not show photoinduced solid-to-liquid transitions. Azopolymers with 6 or 12 methylene spacers showed photoinduced solid-to-liquid transitions. This study demonstrates that spacers are essential for azopolymers with photoinduced reversible solid-to-liquid transitions, and thus, gives an insight into how to design azopolymers for photoinduced healing and processing.
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