1.Hoew does the chain length ofd a fat or oil affect the solubility of
the fat or oil in polar & nonpolar solvents.
2. Margs are prepared by catalytic hydrogenation of some double bonds
of ther acacyl side chains. Discuss melting pt and rancidity
properties of margs & relate these to th changes that have occured to
the oils.
3. Resin manufacture - anme a resin used as a plasticiser, explain the
function & how does the fat/oil contribute to the manufacture of the
named plasticiser.

Hello,

1) The chain length of a fat or oil affects its solubility.  The
shorter the chain, the more soluble in water and other polar solvents.
 The longer the chain, the more soluble it is in non-polar solvents.
http://216.239.39.100/search?q=cache:cIlid4_xsv4J:www.sh.lsuhsc.edu/new_curric/mod1_1/lipid%2520structure%2520I.ppt+chain+length+solubility+fat&hl=en&ie=UTF-8

2) Margarine is hydrogenated to increase it's melting point (more
saturated increases melting point - it allows tighter packing of the
fats, which makes them more stable, and thus gives them a higher
melting point):
http://www.bbc.co.uk/dna/h2g2/alabaster/A597071

and prevent rancid smells by removing the double bonds at which oxygen
can oxidize  the fats, contributing to the rancid smells:
http://www.indiaagronet.com/indiaagronet/Foods%20Technology/Fats%20and%20Oils.htm

Rancid smells increase with chain length (search for rancid in the
document):
http://chemed.chem.purdue.edu/genchem/topicreview/bp/2organic/carbonyl.html

3) Diethylene glycol is a resin plasticizer.  It's method of action is
to couple multiple groups through it's alcohol functional groups.  D
http://216.239.57.100/search?q=cache:zxhtIiXV92cJ:www.coe.ou.edu/cems/ulab/CHE4262/sec002/experiments/experiment1/Evaporator/UC-2054B%2520Diethylene%2520Glycol.pdf+%22resin+plasticizer%22++chemistry+fat&hl=en&ie=UTF-8

Another nice page on plasticizers and plastics:
http://216.239.39.100/search?q=cache:_jTuixtmRsMJ:www.velsicol.com/asps/documents/tech/basics1.doc+%22resin+plasticizer%22+function&hl=en&ie=UTF-8

A general page on plasticizers, resins and such:
http://www.woodfinishingsupplies.com/Lacquer%20by%20Design.htm

Please let me know if you have further questions.

synarchy

Search strategy:
"chain length" fat
margarine rancid
"resin plasticizer"