14
Jan
Light Induced Shape Memory Polymers. A series of PUs with different diselenide bond contents were tested and their shape memory properties and plasticity varied. Several papers have described light-induced changes in the shape of polymers and gels such as contraction bending or volume changes. Shape memory polymers SMPs are regarded as a promising kind of intelligent materials which has the capacity of provisional memorizing the deformed shape and returning to their original shape upon external stimuli heat light 1 and electricity 2 3. Shape-memory polymers have received increasing attention because of their scientific and technological significance.
The applications of these materials are also discussed. Herein thermoset polyurethanes PUs containing diselenide bonds are fabricated that possess visible light-induced plasticity along with shape memory behavior. The shape memory polymers based on the two memory mechanisms are reviewed in detail. Search for more papers by this author. These light induced shape changing polymer materials can be classified as liquid crystal elastomers LCE hydrogels light activated shape memory polymers and composites. Incorporating photothermal fillers provides a straightforward approach to realise shape memory polymers with light-responsive properties.
In this work SMPs that could be actuated by an NIR light without using any NIR photothermal filler was introduced for the first time.
In principle a thermally induced shape-memory effect can be activated by an increase in temperature also obtained by heating on exposure to an electrical current or light illumination. In terms of the shape memory mechanism light-induced shape memory polymers can be divided into two types one is based on photochemical reactions the other is based on light-induced heating. In principle a thermally induced shape-memory effect can be activated by an increase in temperature also obtained by heating on exposure to an electrical current or light illumination. Light-induced shape memory polymers are desirable since they can be stimulated by remote and spatial light control. We prepared light-responsive shape memory polymer SMP micropillars 10 μm in diameter 40 μm in height and 20 μm in pillar-to-pillar distance in a hexagonal array mixed with 0102 mol gold nanorods AuNRs by replica molding from a poly dimethylsiloxane PDMS mold. The shape memory polymers based on the two memory mechanisms are reviewed in detail.