Abstract
Polyhedral oligomeric azido-octaphenylsilsesquioxane (N 3-OPS) was synthesized from octaaminophenylsilsesquioxane (OAPS) via its diazonium salt. The synthesis included nitration of octaphenylsilsesquioxane (OPS) to octanitrophenylsilsesquioxane (ONPS), conversion of ONPS into octaaminophenylsilsesquioxane (OAPS), and conversion of OAPS into N 3-OPS. The kinetics of the conversion of OAPS into N 3-OPS were studied by recording the volume of N 2 gas released with the reaction time, which revealed it to be a 1st order reaction. The chemical structures of ONPS, OAPS and N 3-OPS were characterized by 1H-NMR, GPC, FTIR, 29Si solid NMR, 13C-NMR, XRD, and elemental analysis. It is proposed that the diazonium salt of OAPS was substituted by the main -N 3 group and a few of the -OH groups. The ratio of -N 3:-OH was calculated to be approximately 68:32 in N 3-OPS on the basis of the elemental analysis and 1H-NMR. XRD suggested that N 3-OPS was a kind of amorphous compound. The two-step conversion mechanism of OAPS to N 3-OPS was briefly discussed. TGA results showed that N 3-OPS was stable at ambient temperature.
| Original language | English |
|---|---|
| Pages (from-to) | 4389-4397 |
| Number of pages | 9 |
| Journal | Journal of Applied Polymer Science |
| Volume | 124 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 5 Jun 2012 |
Keywords
- azide
- diazonium salt
- kinetics
- octaphenylsilsesquioxane