Polymers /Resins
8/28/2010
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Polymers are big molecules - poly for many and mer
for the structural unit. Let M be a mer such as water, H2O or methane CH4,
then
M would represent a monomer. Link the moomers together to get MMM or Mx where x
is the number of monomers. 2 to 100 x would
be an oligomer and 100 x and up to
infinity or as large as one can imagine would be a polymer. For low
molecular weight polymers, x would be 100 to
1000; medium molecular weights, 1000 to 10 000; high molecular weight, 10
000 to 100 000, ultrahigh molecular weight, millions and up; and finally
for thermosets, x would be infinity or so large one can't measure them.
One could argue that the molecular weight of a thermoset is avogadro's number
times the weight one thermoset piece. (That is one big molecule !!!) Crosslinking is a way of converting lower molecular weight polymers to higher
molecular molecular weight polymers and finally to thermosets. In plastics
and the other polymer related areas, the polymer is also referred to the resin.
This comes from the early days of polymers when the resin came from the resinous
exudate of plants and was then mixed with other materials to make a useful
material. i.e. The
resin is the pure polymer before
additives and reinforcements are added.
(RDC 7/26/2008)
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Roger D Corneliussen
Editor
Telephone: 610 363 9920
Fax: 610 363 9921
Email:
cornelrd@bee.net
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www.maropolymeronline.com