期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 8, 页码 5350-5355出版社
AMER CHEMICAL SOC
DOI: 10.1021/am406028q
关键词
mechanochemistry; spiropyran; thin films; laser spallation; polymers
资金
- ONR MURI [N00014-12-1-0828]
- National Science Foundation [CMMI 11-61517]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1161517] Funding Source: National Science Foundation
Thin films of mechanochemically active polymer were subjected to laser-generated, high amplitude acoustic pulses. Stress wave propagation through the film produced large amplitude stresses (> 100 MPa) in short time frames (10-20 ns), leading to very high strain rates (ca. 1 x 10(7) to 1 x 10(8) s(-1)). The polymer system, spiropyran (SP)-linked polystyrene (PS), undergoes a force-induced chemical reaction causing fluorescence and color change. Activation of SP was evident via a fluorescence signal in thin films subject to high strain-rates. In contrast, quasi-static loading of bulk SP-linked PS samples failed to result in SP activation. Mechanoresponsive coatings have potential to indicate deformation under shockwave loading conditions.
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