I have currently made some hexagonal chiral structures that incorporate color change. Below are pictures of two of these structures that incorporate different color changes.
This chiral shape contains rubine red powder and blue castin craft dye. The change from purple to blue is depicted here.
This chiral contains blue powder and yellow castin craft dye. The change from blue to yellow is depicted here.
I have also been experimenting with using fabric with the colored polymer. Below are pictures of fabric incorporated into the polymer.
This chiral contains rubine red powder with blue dye and blue fabric has been super glued to the back of it.
This chiral has blue powder with yellow dye and yellow fabric super glued on the polymer.
I recently used a laser-cutter to create a spiral and auxetic shape in the shape memory polymer. After cutting, I placed the material in a hot water bath whose temperature was above 70 deg C. Then applied pressure with my hands and cooled under cold water from the faucet. The results of the spiral and the auextic shapes are given below.
Spiral cut of shape memory polymer using a laser-cutter
Heat induced shape change in laser-cut smp.
Extreme heat induced shape change in laser-cut spiral smp.
Auxetic laser-cut of smp
Curling heat induced shape change of a 2-coil smp
Curling heat-induced shape change of a 3-coil smp
Here is a video of the uncurling of the auxetic amp using a hair dryer: https://www.youtube.com/watch?v=nZGNkn1s4F0&feature=youtu.be
The laser-cutter leaves some burnt edges of shape memory polymer. Also, the integral line segments in the auxetic shape were quite small so did break off when trying to pull them out. For future work, some sanding along the edges could be done to decrease the edge effects from the laser cutter. However, the shape change produced is the desired effect.