This is a brief note I've originally posted as a blog comment, in the
"Sebastien's polyethylene glycol" thread, because it may fall off the map,
otherwise. Also blogger.com is very slow tonight.
-Sebastien
(in response to Adrian's observation that the extruder seems to just chew up
the citric-acid doped PEG.)
Drat. I had my hopes up. Maybe it will work with the pinchwheel.
I emailed Dr. Barone with a few questions. He wasn't sure that it would work,
and suggested we try PVA.
Note on nomenclature (which I was fuzzy on, until now):
(All via wikipedia)
The solid, sold as granules by industrial adhesive suppliers, is
Polyvinyl acetate.
[
en.wikipedia.org]
The liquid emulsion, sold in bottles as wood glue, is
Polyvinyl alcohol. You get polyvinyl alchol by hydrolysis of polyvinyl
acetate. ("Hydrolysis is a chemical reaction or process in which a chemical
compound reacts with water.") In this case adding water makes the acetate
groups come off, and the polyvinyl acetate becomes polyvinyl alchol. Adding
_more_ water turns the polymer into a suspension of polymer in water, aka
wood glue.
[
en.wikipedia.org]
Apparently polyvinyl alcohol is used in the building trade as a dry fiber to
add to concrete. This may be a cheap way to source it.
[
www.drymix.info]
_______________________________________________
Developers mailing list
Developers@reprap.org
[
reprap.org]
