期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 40, 页码 45657-45664出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c14943
关键词
wrinkling; foaming; anticounterfeiting; mask-less soft lithography; supercritical carbon dioxide; porotts polymers; random patterning
资金
- Kodak Research Laboratories (KRL), Eastman Kodak Company, Rochester, NY, USA
Unique and random wrinkle features are desired for applications, especially in anticounterfeiting. Multifunctional wrinkled materials as well as simple wrinkling methods are desired for more applications. In this study, free-standing wrinkle-patterned porous polymer films were prepared using a modified supercritical CO2 foaming strategy. Spontaneous wrinkling was generated by applying moderate normal stress to the polymer films while foaming in situ. The wrinkle characteristics (wavelength and amplitude) were shown to be governed by the film thickness and the magnitude of the applied stress. Excessive (>5000 N) or no stress produced no obvious wrinkling or foaming whatsoever. Moreover, different morphologies of the wrinkles such as brain coral and herringbone patterns were achieved depending upon the shape of the mold used to apply the stress. Thus, the patterns show unique features for each batch process. Notwithstanding, geometric shape of the foamed wrinkle area is customizable. The reported wrinkling strategy offers the complementary advantage of patterning a foam in a polymer film and templating a PDMS stamp for different applications such as mask-less soft lithography, anticounterfeiting, pattern transfer, flexographic printing, and displays.
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