Current Work: Laser-Cutting Shape Memory Polymers

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

Spiral cut of shape memory polymer using a laser-cutter

Heat induced shape change in laser-cut smp.

Heat induced shape change in laser-cut smp.


Extreme heat induced shape change in laser-cut spiral smp.

Extreme heat induced shape change in laser-cut spiral smp.

photo 3 (1)
photo 4 (1)

Auxetic laser-cut of smp

Auxetic laser-cut of smp

Curling heat induced shape change of a 2-coil smp

Curling heat induced shape change of a 2-coil smp

Curling heat-induced shape change of a 3-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.

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