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Universal control on pyroresistive behavior of flexible self-regulating heating devices

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Liu, Yi, Zhang, Han, Porwal, Harshit, Tu, Wei, Evans, Jamie, Newton, Mark, Busfield, James J. C., Peijs, Ton and Bilotti, Emiliano (2017) Universal control on pyroresistive behavior of flexible self-regulating heating devices. Advanced Functional Materials, 27 (39). 1702253. doi:10.1002/adfm.201702253 ISSN 1616-301X.

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Official URL: http://dx.doi.org/10.1002/adfm.201702253

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Abstract

Smart heating devices with reliable self‐regulating performances and high efficiency, combined with additional properties like mechanical flexibility, are of particular interest in healthcare, soft robotics, and smart buildings. Unfortunately, the development of smart heaters necessitates managing normally conflicting requirements such as good self‐regulating capabilities and efficient Joule heating performances. Here, a simple and universal materials design strategy based on a series connection of different conductive polymer composites (CPC) is shown to provide unique control over the pyroresistive properties. Hooke's and Kirchhoff's laws of electrical circuits can simply predict the overall pyroresistive behavior of devices connected in series and/or parallel configurations, hence providing design guidelines. An efficient and mechanically flexible Joule heating device is hence designed and created. The heater is characterized by a zero temperature coefficient of resistance below the self‐regulating temperature, immediately followed by a large and sharp positive temperature coefficient (PTC) behavior with a PTC intensity of around 106. Flexibility and toughness is provided by the selected elastomeric thermoplastic polyurethane (TPU) matrix as well as the device design. The universality of the approach is demonstrated by using different polymer matrices and conductive fillers for which repeatable results are consistently obtained.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title: Advanced Functional Materials
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
ISSN: 1616-301X
Official Date: 19 October 2017
Dates:
DateEvent
19 October 2017Published
23 August 2017Available
11 July 2017Accepted
Volume: 27
Number: 39
Article Number: 1702253
DOI: 10.1002/adfm.201702253
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
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