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Stress Induced Color and Pattern for Information Coding

机译：Stress Induced Color and Pattern for Information Coding

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摘要

On the process of deforming polymer, its morphologies can be vividlyobserved and reflected via the internal stress distribution under the polarizedlight due to its special stretched birefringence, which gives a new way to storeand read information. Inspired by this vivid character, a novel crosslinkedpolyurethane (PU) is designed and used as matrix for coding information, inwhich aluminum acetylacetonate works as the crosslinker to form dynamicalcrosslinked structure with coordinated bonds. By tailoring these two bondsvia a region-selective regulation, the information can be written in thecrosslinked PU. Only under the polarized light, the coded information canbe read as stress induced color on the deformed state. After its recovery, 2Dpattern can be simultaneously formed on the surface of the film. Therefore,the information is expressed in multiple channels. Thanks to the dynamiccharacter, the information can be also erased and rewritten. Therefore, it isa new method for information coding with a high security, which has a widerange of potential applications in data storage, anticounterfeiting labeling,information conversion, and other areas.

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