Table 6.
Properties of polymer aerogels aLNor-xx and aR-Nor-xx fabricated from the aliphatic (aL-9-NBE) and the aromatic (aR-9-NBE) monomer, respectively.
| Sample | Linear Shrinkage 1 (%) | Bulk Density ρb (g cm−3) | Skeletal Density ρs (g cm−3) | Porosity 2 Π (% v/v) | BET Surf. Area σ (m2g−1) | VTotal3 (V1.7-300nm) 4 (cm3 g-1) | Av. Pore Diameter 5 (nm) |
|---|---|---|---|---|---|---|---|
| aLNor-1.5 | 27 ± 3 | 0.070 ± 0.001 | 1.61 ± 0.08 | 96 | 270 | 13.66 (0.58) | 88 |
| aLNor-3 | 30 ± 1 | 0.125 ± 0.003 | 1.38 ± 0.03 | 91 | 302 | 7.28 (0.82) | 13 |
| aLNor-6 | 34 ± 8 | 0.24 ± 0.05 | 1.274 ± 0.009 | 81 | 191 | 3.38 (0.77) | 13 |
| aLNor-12 | 33 ± 5 | 0.5 ± 0.1 | 1.242 ± 0.005 | 60 | 85 | 1.19 (0.43) | 24 |
| aLNor-15 | 35 ± 1 | 0.676 ± 0.002 | 1.229 ± 0.005 | 45 | 54 | 0.66 (0.35) | 24 |
| aRNor-1.5 | 14 ± 1 | 0.032 ± 0.004 | 1.8 ± 0.1 | 98 | 188 | 30.69 (0.58) | 123 |
| aRNor-3 | 15 ± 2 | 0.045 ± 0.001 | 1.7 ± 0.1 | 97 | 294 | 21.63 (0.65) | 88 |
| aRNor-6 | 18 ± 2 | 0.10 ± 0.02 | 1.42 ± 0.02 | 93 | 221 | 9.30 (0.42) | 78 |
| aRNor-12 | 18 ± 1 | 0.17 ± 0.01 | 1.43 ± 0.04 | 88 | 211 | 5.18 (0.59) | 11 |
| aRNor-15 | 12 ± 1 | 0.195 ± 0.008 | 1.31 ± 0.01 | 85 | 148 | 4.36 (0.43) | 116 |
1 Linear shrinkage calculated according to formula: (y1 + y2)/2, where y1 = 100 − [(hfin/hst) × 100] and y2 = 100 − [(dfin/dst) × 100; h: height, d: diameter; 2 Porosity calculated according to formula: (ρs − ρb)/ρs, where ρs: skeletal density and ρb: bulk density; 3 Volume calculated according to formula: 1/ρb − 1/ρs. 4 Cumulative volume of pores between 1.7 and 300 nm from N2-sorption data and the BJH desorption method; 5 Calculated by the 4V/σ method; V was set equal to the maximum volume of N2 adsorbed along the isotherm as P/Po→1.0.