Current Work: Shape Memory Polymers and Heating Applications

Currently, I am working on incorporation of heating through electronic sources.  I have made a sample that contains 20 guage nichrome wire from Jacobs.  The data on the wire is given below:

Data for varying guage lengths of Nichrome wire

Data for varying guage lengths of Nichrome wire (1)

From this data, I used Mathematica to curve fit to a second order polynomial.  The equation for the polynomial is given as:  Amps = 7.55359*10^-6*T^2+0.00549092*T+2.47994.  An image of the curve fit data is given below:

Amperes vs. Temperature curve for 20 guage Nichrome wire

Amperes vs. Temperature curve for 20 guage Nichrome wire

For the 20 guage nichrome wire, a temperature of 30 deg C can be obtained with the application of 2.65 Amps.  The sample with the nichrome wire, as well as, a sample that contains carbon black, and a sample that contains embedded shape memory alloy is seen in the picture below:

Top Left:  Shape Memory Polymer with Embedded Nichrome Wire, Top Right:  Shape Memory Polymer with Embedded Carbon Black, Bottom Left:  Shape Memory Polymer with Embedded Shape Memory Alloy

Top Left: Shape Memory Polymer with Embedded Nichrome Wire, Top Right: Shape Memory Polymer with Embedded Carbon Black, Bottom Left: Shape Memory Polymer with Embedded Shape Memory Alloy

Note that the weight percentage of carbon black is too high, and the sample created was a gummy consistency.

References:

1.  http://jacobs-online.biz/nichrome_wire.htm

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