lecture 8 hybrid poss class 1e interpenetrating networks
TRANSCRIPT
Lecture 8 Hybrid POSS
Class 1E Interpenetrating Networks
Ancient Humans also made Hybrid organic-inorganic materials: Maya
Blue
L. A. Polette, N. Ugarte, M. José Yacamán and R. Chianelli, Sci. Am. Discovering Archaeology, 2000, July–August, 46
Indigo +white clay palygorskite
(Mg,Al)2Si4O10(OH)·4(H2O)(also called Fullers Earth)
Making Hybrid Materials: Class 1E(Interpenetrating network or IPN)
•Two lightly crosslinked networks •Cannot be untangled. •Each network has different mechanical Properties.
• Together they are stronger, tougher than sum of the individual polymers = synergistic
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)/phenylene-silica 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)/phenylene-silica hybrid material with interpenetrating networks and its performance as thermal resistant coating
Tensile10-20 MPa
Stable > 300 °C
Gao, D. and Jia, M. J. Appl. Polym. Sci. 2012. doi: 10.1002/app.38372
Organic–inorganic polymer hybrids based on unsaturated polyester
Journal of Non-Crystalline Solids, 2002, 311, 195–198
•Sol-gel polymerization of phenyltriethoxysilane in presence of Linear organic polymer •Photochemical cure of organic network
What about a forming a particle based gel in a monomer as solvent, then polymerize it
Macromolecules, 1991, 24 (19), pp 5481–5483
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 non-linear, synergistic effect on the mechanical properties
Now onto covalent bondedclass 2 hybrids