Date: Thu May 13 2004 - 19:14:26 EDT
I have been working with a mixture of oleic acid and paraffin wax as a
binder. The oleic acid is in the mix as a rheology modifier. I have
noticed something strange about the physical properties of the material and
I hope someone can explain it to me. I am not an organic chemist.
I use a low melting (around 50 deg C) paraffin wax which is a mixture of C20
to C35 alkanes, mostly C23 - C26. I use lab grade (99.9%) oleic acid.
I melt the wax at 100 deg C and mix in the oleic acid very thoroughly then
cool it to solidify.
I have tried 2 weight percent oleic acid and 5 weight percent oleic acid.
The strange effect is that the physical properties of the resulting solid
material changes over time. The low oleic acid mix becomes more brittle in
2 - 5 days and the high oleic acid becomes stronger and tougher in 2 - 5
Why is this? Is there some sort of cross-linking reacion with the double
bond? Can the oleic acid oxidise a little after a few days exposed to air?
ORGLIST - Organic Chemistry Mailing List
Website / Archive / FAQ: http://www.orglist.net
To post a message (TO EVERYBODY) send to everybody$##$orglist.net
To unsubscribe, send to everybody-request$##$orglist.net the message: unsubscribe your_orglist_password your_address
List coordinator: Joao Aires de Sousa (coordinator$##$orglist.net)
This archive was generated by hypermail 2.1.4 : Fri May 14 2004 - 05:47:01 EDT