CHED 447 |
| Reported here is a study of reversibly associative polymer networks defined by metal-ligand coordination of bimetallic Pd(II) pincer cross-linkers with poly(4-vinylpyridine) in DMSO. The mechanical properties, including the viscosity and elasticity, of the networks formed depend on the ligand exchange kinetics of the metal-ligand coordination complex, which are dictated by the choice of metal complex. Oscillatory rheology was used to measure the viscosity and elasticity of the gels formed by the networks. At sufficiently high concentration of the cross-linker, the network mechanical properties are independent of the cross-linker structure that links the two metal sites. At concentrations near the percolation threshold, however, differences between cross-linker structures are observed. |
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Undergraduate Research Poster Session: Organic Chemistry
11:00 AM-1:00 PM, Monday, April 7, 2008 Morial Convention Center -- Hall A, Poster
Division of Chemical Education |