A printable optical time-temperature integrator based on shape memory in a chiral nematic polymer network

D.J.D. Davies, A.R. Vaccaro, S. Morris, N. Herzer, A.P.H.J. Schenning, C.W.M. Bastiaansen

Research output: Contribution to journalArticleAcademicpeer-review

51 Citations (Scopus)

Abstract

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.
LanguageEnglish
Pages2723-2727
JournalAdvanced Functional Materials
Volume23
Issue number21
DOIs
StatePublished - 2013

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integrators
Shape memory effect
Polymers
embossing
polymers
temperature sensors
Temperature sensors
Wavelength
shift
wavelengths
Color
color
Temperature
temperature
sensors
Sensors
food
Drug products
glass transition temperature
Metal foil

Cite this

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title = "A printable optical time-temperature integrator based on shape memory in a chiral nematic polymer network",
abstract = "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.",
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A printable optical time-temperature integrator based on shape memory in a chiral nematic polymer network. / Davies, D.J.D.; Vaccaro, A.R.; Morris, S.; Herzer, N.; Schenning, A.P.H.J.; Bastiaansen, C.W.M.

In: Advanced Functional Materials, Vol. 23, No. 21, 2013, p. 2723-2727.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Davies,D.J.D.

AU - Vaccaro,A.R.

AU - Morris,S.

AU - Herzer,N.

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AU - Bastiaansen,C.W.M.

PY - 2013

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AB - 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.

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