scholarly journals Shape Memory Polymer Foam with Programmable Apertures

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1914 ◽  
Author(s):  
Mario Walter ◽  
Fabian Friess ◽  
Martin Krus ◽  
Seyed Mohammad Hassan Zolanvari ◽  
Gunnar Grün ◽  
...  

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.

2010 ◽  
Vol 42 (3) ◽  
pp. 304-314 ◽  
Author(s):  
M. Di Prima ◽  
K. Gall ◽  
D.L. McDowell ◽  
R. Guldberg ◽  
A. Lin ◽  
...  

2020 ◽  
Vol 75 ◽  
pp. 65-71 ◽  
Author(s):  
John D. Horn ◽  
Duncan J. Maitland ◽  
Jonathan Hartman ◽  
Jason M. Ortega

2000 ◽  
Vol 2000.13 (0) ◽  
pp. 449-450
Author(s):  
Hisaaki TOBUSHI ◽  
Shunichi HAYASHI ◽  
Kayo OKUMURA ◽  
Masato ENDOU

2000 ◽  
Vol 2000.1 (0) ◽  
pp. 47-48
Author(s):  
Masato ENDOU ◽  
Hisaaki TOBUSHI ◽  
Shunichi HAYASHI ◽  
Kazuyuki TAKATA ◽  
Kayo OKUMURA

2013 ◽  
Vol 41 (4) ◽  
pp. 725-743 ◽  
Author(s):  
J. M. Ortega ◽  
J. Hartman ◽  
J. N. Rodriguez ◽  
D. J. Maitland

2009 ◽  
Vol 18 (11) ◽  
pp. 115014 ◽  
Author(s):  
Greg Vialle ◽  
Matthew Di Prima ◽  
Erica Hocking ◽  
Ken Gall ◽  
Hamid Garmestani ◽  
...  

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