Polymers /Resins
7/26/2008
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)
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Notes
In the
language of the nonchemist they are sticky, gooey and
sometime hard organic materials, in contrast to liquids like water or
gases like oxygen. They are usually the organic materials used
for building things. In practice polymers include plastics, rubber, composites,
biomaterials, coatings, adhesives, wood, paper - i.e. any thing that can
support a load.
(RDC 7/26/2008)
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Review Articles
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
US Patents
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Journal Articles
1/9/2009
Review
Synthesis of Functional Polymers by Post-Polymerization Modification
(p 48-58) Angewandte
Chemie International Edition 48 #1 (2009)
Abstract
Modular Synthesis of Functional Nanoscale
Coordination Polymers
(p 650-658)
Angewandte Chemie International Edition 48 #4 (2009)
Abstract
10/24/2008
Shape-Programmable Macromolecules
(387 - 1398)
Accounts of Chemical Research 41 #10 (2008)
Abstract
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Roger D. Corneliussen
Editor
Telephone: 610 883 0055
rcorneliussen@4spe.org
www.maropolymeronline.com
Copyright 2008 by Roger D. Corneliussen