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A Printable Optical Time-Temperature Integrator Based on Shape Memory in a Chiral Nematic Polymer Network

机译:手性向列型聚合物网络中基于形状记忆的可印刷光学时温积分器

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摘要

An optical and irreversible temperature sensor (e.g., a time-temperature integrator) is reported based on a mechanically embossed chiral-nematic polymer network. The polymer consists of a chemical and a physical (hydrogen-bonded) network and has a reflection band in the visible wavelength range. The sensors are produced by mechanical embossing at elevated temperatures. A relative large compressive deformation (up to 10%) is obtained inducing a shift to shorter wavelength of the reflection band (>30 nm).After embossing, a temperature sensor is obtained that exhibits an irreversible optical response. A permanent color shift to longer wavelengths (red) is observed upon heating of the polymer material to temperatures above the glass transition temperature. It is illustrated that the observed permanent color shift is related to shape memory in the polymer material. The films can be printed on a foil, thus showing that these sensors are potentially interesting as time-temperature integrators for applications in food and pharmaceutical products.
机译:报道了基于机械压花的手性-向列型聚合物网络的光学且不可逆的温度传感器(例如,时间-温度积分器)。该聚合物由化学和物理(氢键)网络组成,在可见波长范围内具有反射带。传感器是在高温下通过机械压花制成的。获得相对较大的压缩变形(高达10%),从而导致向反射带的较短波长(> 30 nm)偏移。压花后,获得的温度传感器具有不可逆的光学响应。在将聚合物材料加热到高于玻璃化转变温度的温度时,观察到永久变色到更长的波长(红色)。说明了观察到的永久色移与聚合物材料中的形状记忆有关。薄膜可以印在箔片上,因此表明这些传感器作为食品和药品中的时间-温度积分器可能很有趣。

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  • 来源
    《Advanced Functional Materials》 |2013年第21期|2723-2727|共5页
  • 作者单位

    Functional Organic Materials and Devices Department of Chemical Engineering and Chemistry Eindhoven University of Technology Den Dolech 2, 5600 MB Eindhoven,The Netherlands;

    Functional Organic Materials and Devices Department of Chemical Engineering and Chemistry Eindhoven University of Technology Den Dolech 2, 5600 MB Eindhoven,The Netherlands;

    Department of Engineering University of Cambridge 9 JJ Thomson Avenue, Cambridge, CB3 OFA, UK;

    Functional Organic Materials and Devices Department of Chemical Engineering and Chemistry Eindhoven University of Technology Den Dolech 2, 5600 MB Eindhoven,The Netherlands;

    Functional Organic Materials and Devices Department of Chemical Engineering and Chemistry Eindhoven University of Technology Den Dolech 2, 5600 MB Eindhoven,The Netherlands ,School of Engineering and Materials Science Queen Mary, University of London Mile End Road, London, E1 4NS, UK;

    Functional Organic Materials and Devices Department of Chemical Engineering and Chemistry Eindhoven University of Technology Den Dolech 2, 5600 MB Eindhoven,The Netherlands;

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