h a l f b a k e r yContrary to popular belief
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Melamine foam has a thermal conductivity of 0.0361, wanting
to get below 0.015.
I propose using carbon nano spheres (bucky balls) to fill the
foam cells.
Perhaps the effervescent reaction to generate the foam can
also include reaction to produce bucky balls? not sure on the
efficiency
of such a reaction.
melamine foam spec sheet
http://www.soundpro...f/Melamine-Foam.pdf
ref to TC [lostmind, Nov 21 2013]
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I'm not sure I understand how this is supposed to
reduce the thermal conductivity of a foamed
material. I believe buckyballs have a high thermal
conductivity (higher than air, anyway), so filling
the normally air filled pores/cells of a material with
them won't decrease thermal conductivity. |
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Yes, smaller pore sizes typically equate to a more
convoluted conduction path, and thus lower
conductivity, but this doesn't decrease the pore
size of the base material. |
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Ok, so perhaps bucky balls in the matrix rather than
the pores? |
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If it can be done without affecting the structural
integrity of the walls, then that might be an
improvement, but I wouldn't want to swear either
way without a lot more thermal analysis than I want
to do (or probably can, honestly). |
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Can you modify buckyball surface chemistry? add
something that enhances the vDw forces between
the buckyballs and the melamine-formaldehyde
linkages? |
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Scratch that, buckyballs use all 4 bonds. Was thinking
of a phenol |
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Typically, melamine is an open-cell
(reticulated) foam, so for lower TC a solution
may be to fill the voids with Argon. How to
keep the Argon from diffusing away is
another problem. |
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So a closed cell foam would have optimised diffusion
paths? |
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A closed cell foam has no diffusion paths (except by
diffusion through the walls of the cells). Argon-filled
closed cell foams exist, although they slowly lose
argon. |
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//Melamine foam has a thermal conductivity of
0.0361, wanting to get below 0.015// Units? |
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Units are irrelevant. The ratio of the two
values indicates that approximately a 60%
improvement is the desired outcome. |
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I understand that closed pore is inherently denser in
matrix. Although that may be something to modify
with surface chemistry. Perhaps cooling/curing rate
too. |
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Closed cell foams may be envisaged as a
polymer surrounding many voids; open cell
foam as a void containing many strands of
polymer. So yes, closed-cell is inherently and
unavoidably denser. |
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