期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 9, 页码 3040-3044出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201510171
关键词
cross-linking; mechanochromism; mechanophores; polymers; spirothiopyran
资金
- National Natural Science Foundation of China [21304076]
- China Postdoctoral Science Foundation [2014T70612]
- Natural Science Foundation of Fujian Province [2014J01060]
- UK Engineering and Physical Sciences Research Council (EPSRC)
- EPSRC [EP/L000075/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L000075/1] Funding Source: researchfish
Incorporation of small reactive moieties, the reactivity of which depends on externally imposed load (so-called mechanophores) into polymer chains offers access to a broad range of stress-responsive materials. Here, we report that polymers incorporating spirothiopyran (STP) manifest both green mechanochromism and load-induced addition reactions in solution and solid. Stretching a macromolecule containing colorless STP converts it into green thiomerocyanine (TMC), the mechanically activated thiolate moiety of which undergoes rapid thiol-ene click reactions with certain reactive C=C bonds to form a graft or a cross-link. The unique dual mechanochemical response of STP makes it of potentially great utility both for the design of new stress-responsive materials and for fundamental studies in polymer physics, for example, the dynamics of physical and mechanochemical remodeling of loaded materials.
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