Transcript Lecture 8 Hybrid POSS

Lecture 11b Hybrid
Interpenetrating Networks
Making Hybrid Materials: Class 1E
(Interpenetrating network or IPN)
•Two lightly crosslinked networks • Together they are
•Cannot be untangled.
stronger, tougher than
•Each network has different
sum of the individual
mechanical
polymers = synergistic
Properties.
All organic IPN adhesives & coatings
Simultaneous Interpenetrating networks
•The two networks assembled at the same time
•Phase separation of hard colloidal particles would
ruin IPN
Sequential Interpenetrating networks
•The two networks are not
assembled at the same time
•In this case the inorganic
network is assembled before
the organic
If phase separation of particles occurs, it is
not an IPN
This is a hybrid, inorganic filled polymer, an extreme case
of Class 1C. However, many publications refer to similar
hybrids as IPN’s
Synthesis of poly(methylphenylsiloxane)/phenylenesilica hybrid material with interpenetrating networks
and its performance as thermal resistant coating
Gao, D. and Jia, M. J. Appl. Polym. Sci. 2012. doi: 10.1002/app.38372
Synthesis of poly(methylphenylsiloxane)/phenylenesilica hybrid material with interpenetrating networks
and its performance as thermal resistant coating
Stable > 300 °C
Tensile
10-20 MPa
Gao, D. and Jia, M. J. Appl. Polym. Sci. 2012. doi: 10.1002/app.38372
Organic–inorganic polymer hybrids based
on unsaturated polyester
•Sol-gel polymerization of phenyltriethoxysilane in
presence of Linear organic polymer
•Photochemical cure of organic network
Journal of Non-Crystalline Solids, 2002, 311, 195–198
What about a forming a particle based gel in
a monomer as solvent, then polymerize it
Simultaneous Interpenetrating networks: "Inverse"
organic-inorganic composite materials.
Monomer
containing both
silica and organic
components
splits apart
Macromolecules, 1991, 24 (19), pp 5481–5483
Simultaneous Interpenetrating networks: "Inverse"
organic-inorganic composite materials.
For a hybrid to be an IPN,
there must be a nonlinear, synergistic effect
on the mechanical
properties
Macromolecules, 1991, 24 (19), pp 5481–5483
More recent interpenetrating network:
tetrabenzylalkoxysilane sol-gel
Angew. Chem. Int. Ed. 2009, 48, 8254 –8258
Angew. Chem. Int. Ed. 2007, 46, 628 –632