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09-04-2012, 10:32 PM
  #9
bigduga
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Quote:
Originally Posted by AIREAYE View Post
Why not? It worked with wood sticks...
You had a wood stick that swelled to double it's dry volume when it got wet?

"Hydrophillic" means at best it actively sucks water like a sponge and at worst, dissolves.

CNC bonds don't dissolve, which is good, but hydrophillic bonds that dont break are the ones that swell-up...and when they swell up:

Quote:
Swelling introduces a large number of nano-defects in the cellulose structure. Although there is little swelling of a single CNC, water can penetrate into amorphous cellulose with ease, pushing apart the individual cellulose molecules in those regions. In addition, the bonds and interfaces between neighboring CNC will be disrupted, thereby significantly reducing the strength of any material reinforced with CNCs. To make matters worse, water can move easily over the surface/interfaces of the CNCs, thereby allowing water to penetrate far into a composite containing CNCs.
...it gets rapidly brittle, which is a bummer.

The solution is to bind it to a hydrophobic compound, which weakens it substantially, because hydrophiles and hydrophobes don't bond well, or coat it in some sort of sheath or paint, which only works as long as the sealant doesn't crack...which if it's paint is what? three shifts of ice time?

Tougher thicker coatings will only hinder the elasticity of the CNC or otherwise cripple the properties of the CNC matrix that make it an attractive substitute for carbon fiber weaves.

I'm having a hard time seeing how you manage to make this a big enough gain over carbon fiber to accept the durability trade-off of using a stick that can't get wet.

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