POLY 63 |
| A novel approach will be presented using nanometer sized electrically conducting polypyrrole particles not only to induce conductivity to a polymer blend but also to improve its mechanical properties by interfacial compatibilization. A model blend system was chosen, based on mono-amino terminated polystyrene and carboxylic acid endgroup functionalized poly(methyl methacrylate), synthesized by ATRP and RAFT, respectively. However, carboxylic acid and amine groups do not undergo a coupling reaction during melt mixing. This fact is utilized to incorporate electrically conducting polypyrroles, containing 1,3-oxazoline and 1,3-oxazinone moieties, which selectively react with carboxylic acid and amino groups, respectively. Thus polypyrrole locates selectively at the interface, building up percolation paths. On condition of a co-continuous morphology an electrically conductive bulk material is obtained with a reduced threshold concentration. The challenge is to fit size and reactivity of the polypyrroles to the domain size of the blend, so that it can act effectively as interfacial modifier. |
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Functional Nanomaterials from New Polymer Synthetic Methodologies
2:00 PM-5:50 PM, Sunday, April 6, 2008 Hilton New Orleans Riverside -- Grand Salon 3, Oral
Division of Polymer Chemistry |