title: Ultrasonic Cavitation Induced Shape-Memory Effect in Porous Polymer Networks.
abstract: Inspired by the application of ultrasonic cavitation based mechanical force (CMF) to open small channels in natural soft materials (skin or tissue), it is explored whether an artificial polymer network can be created, in which shape-changes can be induced by CMF. This concept comprises an interconnected macroporous rhodium-phosphine (Rh-P) coordination polymer network, in which a CMF can reversibly dissociate the Rh-P microphases. In this way, the ligand exchange of Rh-P coordination bonds in the polymer network is accelerated, resulting in a topological rearrangement of molecular switches. This rearrangement of molecular switches enables the polymer network to release internal tension under ultrasound exposure, resulting in a CMF-induced shape-memory capability. The interconnected macroporous structure with thin pore walls is essential for allowing the CMF to effectively permeate throughout the polymer network. Potential applications of this CMF-induced shape-memory polymer can be mechanosensors or ultrasound controlled switches.
authors.affiliation: Institute of Biomaterial Science, Helmholtz-Zentrum Geesthacht, Kantstr. 55, 14513, Teltow, Germany.|Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14469, Potsdam, Germany.|Tianjin University-HZG Research Center, Joint Laboratory for Biomaterials and Regenerative Medicine, Weijin Road 92, 300072, Tianjin, China and Kantstr. 55, 14513 Teltow, Germany.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Zhang
authors.affiliation: Institute of Biomaterial Science, Helmholtz-Zentrum Geesthacht, Kantstr. 55, 14513, Teltow, Germany.|Tianjin University-HZG Research Center, Joint Laboratory for Biomaterials and Regenerative Medicine, Weijin Road 92, 300072, Tianjin, China and Kantstr. 55, 14513 Teltow, Germany.
authors.forename: Marc
authors.initials: M
authors.lastname: Behl
authors.affiliation: Institute of Biomaterial Science, Helmholtz-Zentrum Geesthacht, Kantstr. 55, 14513, Teltow, Germany.|Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14469, Potsdam, Germany.|Tianjin University-HZG Research Center, Joint Laboratory for Biomaterials and Regenerative Medicine, Weijin Road 92, 300072, Tianjin, China and Kantstr. 55, 14513 Teltow, Germany.
authors.forename: Xingzhou
authors.initials: X
authors.lastname: Peng
authors.affiliation: Institute of Biomaterial Science, Helmholtz-Zentrum Geesthacht, Kantstr. 55, 14513, Teltow, Germany.
authors.forename: Muhammad Yasar
authors.initials: MY
authors.lastname: Razzaq
authors.affiliation: Institute of Biomaterial Science, Helmholtz-Zentrum Geesthacht, Kantstr. 55, 14513, Teltow, Germany.|Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14469, Potsdam, Germany.|Tianjin University-HZG Research Center, Joint Laboratory for Biomaterials and Regenerative Medicine, Weijin Road 92, 300072, Tianjin, China and Kantstr. 55, 14513 Teltow, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Lendlein
mesh_terms: D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D013499:Surface Properties; D014465:Ultrasonics
chemical_list: D011108:Polymers
keywords: coordination bonds; macroporous structures; mechanical forces; shape-memory polymers; ultrasound