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. 2016 Sep 9;6:32989. doi: 10.1038/srep32989

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Optical images of the LED lights under the stretching of foams: (a) PA foams; (b) A-PA foams; (c) PA-foams with notch; (d) A-PA foams with notch. (e,f) Schematic illustration of possible crack propagating mechanism of PA foams and crack resisting mechanism of A-PA foams.