Current Work: Shape Memory Polymers with Color Change

I recently tried again to incorporate more Solar Color Dust colors into a shape memory polymer.  I made four samples of the following ratios:  1.57 ml Epon 826/2.43 ml Jeffamine/3.12 ml NGDE.  This ratio corresponds to a glass transition temperature of approximately 40 deg C.  For these samples, the Solar Color Dust was mixed according to the instructions per the website (10 grams of dust to 1 pint of epoxy).  Three of the samples contained just Solar Color Dust and epoxy, while the fourth contained Solar Color Dust, epoxy, and Castin Craft blue dye.  Pictures of the samples are given below for heated and unheated specimens:

Shape Memory Polymers with Embedded Color Powders and Dyes After Curing

Shape Memory Polymers with Embedded Color Powders and Dyes After Curing

Left to Right: Castin Craft Blue Dye and 0.24 g of Rubine Red Solar Color Dust, 0.24 g of Magenta Solar Color Dust, 0.26 g Sky Blue Solar Color Dust, 0.22 g Green Solar Color Dust

Left to Right: Castin Craft Blue Dye and 0.24 g of Rubine Red Solar Color Dust, 0.24 g of Magenta Solar Color Dust, 0.26 g Sky Blue Solar Color Dust, 0.22 g Green Solar Color Dust

I took each of the samples and added some heat with my hand.  The result is given below:

Castin Craft Blue Dye with Rubine Red Solar Color Dust with Applied Heat from My Hand

Castin Craft Blue Dye with Rubine Red Solar Color Dust with Applied Heat from My Hand

Magenta Solar Color Dust with Applied Heat from Hand

Magenta Solar Color Dust with Applied Heat from Hand

Sky Blue Solar Color Dust with Applied Heat from Hand

Sky Blue Solar Color Dust with Applied Heat from Hand

Green Solar Color Dust with Applied Heat from Hand

Green Solar Color Dust with Applied Heat from Hand

From this experimentation, Rubine Red seems to give the most significant color change out of all the powders an hand.  Also, from the first picture, you can see that there is some clumping inside the epoxy.  This clumping is due to the fact that the powder is not well dispersed within the epoxy.  Therefore, may next time sonication might be used to disperse the particles.  Since, I had some extra material left over, I mixed the Magenta, Sky Blue, and Green epoxy mixtures together and obtained the following result:

Mixture of Green, Sky Blue, and Magenta Solar Color Dust with Epoxy

      Mixture of Green, Sky Blue, and Magenta Solar Color Dust with Epoxy

 

Mixture of Green, Sky Blue, and Magenta Solar Color Dust with Epoxy and Heated with Hand

Mixture of Green, Sky Blue, and Magenta Solar Color Dust with Epoxy and Heated with Hand

Note when all three of these colors are mixed together and not dispersed, the coloring is very beautiful and unique.  However, due to lack of the dispersion, when heat is applied with the hand, not as visible of change is seen in the sample.

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