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Shape Memory Polymer Foam with Programmable Apertures

Fraunhofer Institute for Applied Polymer Research IAP, Geiselbergstr. 69, 14476 Potsdam, Germany
Fraunhofer Institute for Building Physics IBP, Fraunhoferstraße 10, 83626 Valley, Germany
Fraunhofer Institute for Chemical Technology ICT, Joseph-von-Fraunhofer-Straße 7, 76327 Pfinztal, Germany
Author to whom correspondence should be addressed.
Polymers 2020, 12(9), 1914;
Received: 15 July 2020 / Revised: 14 August 2020 / Accepted: 19 August 2020 / Published: 25 August 2020
In this work, a novel type of polyester urethane urea (PEUU) foam is introduced. The foam was produced by reactive foaming using a mixture of poly(1,10–decamethylene adipate) diol and poly(1,4–butylene adipate) diol, 4,4′-diphenylmethane diisocyanate, 1,4–butanediol, diethanolamine and water as blowing agent. As determined by differential scanning calorimetry, the melting of the ester-based phases occurred at temperatures in between 25 °C and 61 °C, while the crystallization transition spread from 48 °C to 20 °C. The mechanical properties of the foam were simulated with the hyperplastic models Neo-Hookean and Ogden, whereby the latter showed a better agreement with the experimental data as evidenced by a Pearson correlation coefficient R² above 0.99. Once thermomechanically treated, the foam exhibited a maximum actuation of 13.7% in heating-cooling cycles under a constant external load. In turn, thermal cycling under load-free conditions resulted in an actuation of more than 10%. Good thermal insulation properties were demonstrated by thermal conductivities of 0.039 W·(m·K)−1 in the pristine state and 0.052 W·(m·K)−1 in a state after compression by 50%, respectively. Finally, three demonstrators were developed, which closed an aperture or opened it again simply by changing the temperature. The self-sufficient material behavior is particularly promising in the construction industry, where programmable air slots offer the prospect of a dynamic insulation system for an adaptive building envelope. View Full-Text
Keywords: foam; programmable material; polyester urethane urea; actuation; construction; air slot foam; programmable material; polyester urethane urea; actuation; construction; air slot
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MDPI and ACS Style

Walter, M.; Friess, F.; Krus, M.; Zolanvari, S.M.H.; Grün, G.; Kröber, H.; Pretsch, T. Shape Memory Polymer Foam with Programmable Apertures. Polymers 2020, 12, 1914.

AMA Style

Walter M, Friess F, Krus M, Zolanvari SMH, Grün G, Kröber H, Pretsch T. Shape Memory Polymer Foam with Programmable Apertures. Polymers. 2020; 12(9):1914.

Chicago/Turabian Style

Walter, Mario, Fabian Friess, Martin Krus, Seyed M.H. Zolanvari, Gunnar Grün, Hartmut Kröber, and Thorsten Pretsch. 2020. "Shape Memory Polymer Foam with Programmable Apertures" Polymers 12, no. 9: 1914.

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