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Dylan J. D. Davies, Antonio R. Vaccaro, Stephen M. Morris, Nicole Herzer, Albertus P. H. J. Schenning and Cees W. M. Bastiaansen A Printable Optical Time-Temperature Integrator Based on Shape Memory in a Chiral Nematic Polymer Network Advanced Functional Materials 23

Version of Record online: 15 JAN 2013 | DOI: 10.1002/adfm.201202774

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An optical, irreversible temperature sensor is fabricated based on a chiral-nematic polymer network that has an orange reflection color. After mechanical embossing of the polymer film a temporary shift to a green color is achieved, which shifts back to the original color above a certain threshold temperature. This sensor can be printed on a foil, thus displaying its potential application as a battery-free time-temperature integrator in food and pharmaceutical products.

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