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Lecture 8 Hybrid POSS

Lecture 8 Hybrid POSS. Class 1E Interpenetrating Networks. Optional make -up homework for Quiz 3. Another powerpoint slide This time on a polysilsesquioxane or POSS research paper Due Saturday October 20 th at 6 PM to my email address: daloy@email.arizona.edu Format: Title

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Lecture 8 Hybrid POSS

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  1. Lecture 8 Hybrid POSS Class 1E Interpenetrating Networks

  2. Optional make-up homework for Quiz 3 • Another powerpoint slide • This time on a polysilsesquioxane or POSS research paper Due Saturday October 20th at 6 PM to my email address: daloy@email.arizona.edu Format: Title Your name & student number Chemdraw graphic (please make it legible) One bullet describing hypothesis in paper One bullet saying why this research was important One bullet describing summarizing how they tested hyothesis One bullet describing their results One bullet indicating if hypothesis was proven or disproven Citation for paper: Journal, year, volume, page No duplicate papers!

  3. Ancient Humans also made Hybrid organic-inorganic materials: Maya Blue Indigo + white clay palygorskite (Mg,Al)2Si4O10(OH)·4(H2O) (also called Fullers Earth) L. A. Polette, N. Ugarte, M. José Yacamán and R. Chianelli, Sci. Am. Discovering Archaeology, 2000, July–August, 46

  4. 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

  5. Simultaneous Interpenetrating networks •The two networks assembled at the same time •Phase separation of hard colloidal particles would ruin IPN

  6. Sequential Interpenetrating networks •The two networks are not assembled at the same time •In this case the inorganic network is assembled before the organic

  7. 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

  8. 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

  9. Synthesis of poly(methylphenylsiloxane)/phenylene-silica hybrid material with interpenetrating networks and its performance as thermal resistant coating Tensile 10-20 MPa Stable > 300 °C Gao, D. and Jia, M. J. Appl. Polym. Sci. 2012. doi: 10.1002/app.38372

  10. 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

  11. What about a forming a particle based gel in a monomer as solvent, then polymerize it

  12. Simultaneous Interpenetrating networks: "Inverse" organic-inorganic composite materials. Monomer containing both silica and organic components splits apart Macromolecules, 1991, 24 (19), pp 5481–5483

  13. 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 Macromolecules, 1991, 24 (19), pp 5481–5483

  14. Now onto covalent bondedclass 2 hybrids

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