TY  - JOUR
A1  - Zhang, Pengfei
A1  - Behl, Marc
A1  - Balk, Maria
A1  - Peng, Xingzhou
A1  - Lendlein, Andreas
T1  - Shape-programmable architectured hydrogels sensitive to ultrasound
JF  - Macromolecular rapid communications
N2  - On-demand motion of highly swollen polymer systems can be triggered by changes in pH, ion concentrations, or by heat. Here, shape-programmable, architectured hydrogels are introduced, which respond to ultrasonic-cavitation-based mechanical forces (CMF) by directed macroscopic movements. The concept is the implementation and sequential coupling of multiple functions (swellability in water, sensitivity to ultrasound, shape programmability, and shape-memory) in a semi-interpenetrating polymer network (s-IPN). The semi-IPN-based hydrogels are designed to function through rhodium coordination (Rh-s-IPNH). These coordination bonds act as temporary crosslinks. The porous hydrogels with coordination bonds (degree of swelling from 300 +/- 10 to 680 +/- 60) exhibit tensile strength sigma(max) up to 250 +/- 60 kPa. Shape fixity ratios up to 90% and shape recovery ratios up to 94% are reached. Potential applications are switches or mechanosensors.
KW  - cavitation-based mechanical force
KW  - rhodium-phosphine coordination bonds
KW  - semi-IPN hydrogels
KW  - shape-memory effect
Y1  - 2020
U6  - https://doi.org/10.1002/marc.201900658
SN  - 1022-1336
SN  - 1521-3927
VL  - 41
IS  - 7
PB  - Wiley-VCH
CY  - Weinheim
ER  -