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Flexible dielectric polymer can stand the heat

Date:
August 6, 2015
Source:
Penn State
Summary:
Easily manufactured, low cost, lightweight, flexible dielectric polymers that can operate at high temperatures may be the solution to energy storage and power conversion in electric vehicles and other high temperature applications, according to a team of engineers.
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Researcher holds flexible dielectric material. Pull out shows boron nitride nanosheets.
Credit: Qing Wang, Penn State

Easily manufactured, low cost, lightweight, flexible dielectric polymers that can operate at high temperatures may be the solution to energy storage and power conversion in electric vehicles and other high temperature applications, according to a team of Penn State engineers.

"Ceramics are usually the choice for energy storage dielectrics for high temperature applications, but they are heavy, weight is a consideration and they are often also brittle," said Qing Wang, professor of materials science and engineering, Penn State. "Polymers have a low working temperature and so you need to add a cooling system, increasing the volume so system efficiency decreases and so does reliability."

Dielectrics are materials that do not conduct electricity, but when exposed to an electric field, store electricity. They can release energy very quickly to satisfy engine start-ups or to convert the direct current in batteries to the alternating current needed to drive motors.

Applications like hybrid and electric vehicles, aerospace power electronics and underground gas and oil exploration equipment require materials to withstand high temperatures. The researchers developed a cross-linked polymer nanocomposite containing boron nitride nanosheets. This material has high-voltage capacity for energy storage at elevated temperatures and can also be photo patterned and is flexible. The researchers report their results in a recent issue of Nature.

This boron nitride polymer composite can withstand temperatures of more than 480 degrees Fahrenheit under the application of high voltages. The material is easily manufactured by mixing the polymer and the nanosheets and then curing the polymer either with heat or light to create crosslinks. Because the nanosheets are tiny -- about 2 nanometers in thickness and 400 nanometers in lateral size, the material remains flexible, but the combination provides unique dielectric properties, which include higher voltage capability, heat resistance and bendability.

"Our next step is to try to make this material in large scale and put it into a real application," said Wang. "Theoretically, there is no exact scalability limit."


Story Source:

Materials provided by Penn State. Original written by A'ndrea Elyse Messer. Note: Content may be edited for style and length.


Journal Reference:

  1. Qi Li, Lei Chen, Matthew R. Gadinski, Shihai Zhang, Guangzu Zhang, Haoyu Li, Aman Haque, Long-Qing Chen, Tom Jackson, Qing Wang. Flexible high-temperature dielectric materials from polymer nanocomposites. Nature, 2015; 523 (7562): 576 DOI: 10.1038/nature14647

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Penn State. "Flexible dielectric polymer can stand the heat." ScienceDaily. ScienceDaily, 6 August 2015. <www.sciencedaily.com/releases/2015/08/150806133156.htm>.
Penn State. (2015, August 6). Flexible dielectric polymer can stand the heat. ScienceDaily. Retrieved May 8, 2017 from www.sciencedaily.com/releases/2015/08/150806133156.htm
Penn State. "Flexible dielectric polymer can stand the heat." ScienceDaily. www.sciencedaily.com/releases/2015/08/150806133156.htm (accessed May 8, 2017).