Table 3.
DMA data for control and experimental adhesives under dry conditions
| Sample | Storage modulus at 25 °C (MPa) x 103 | Storage modulus at 37 °C (MPa) x 103 | Storage modulus at 180 °C (MPa) | Tg (°C)a | Height of tan δ peak |
|---|---|---|---|---|---|
| C0 | 4.59±0.09 | 4.46±0.09 | 33.9±0.5 | 150.6±1.2 | 0.70±0.01 |
| E1-25 | 3.84±0.07b | 3.72±0.06b | 37.4±1.6b | 145.9±1.8b | 0.61±0.01b |
| E1-25-6.8%D2O | 4.19±0.12b,c | 3.66±0.09b | 23.1±1.6b,c | 128.3±0.0b,c | 0.68±0.02c |
| E2-25 | 4.64±0.05c | 4.44±0.02c | 41.6±1.5b,c | 122.9±2.5b,c | 0.74±0.01b,c |
| E2-25-8.7%D2O | 5.44±0.03b,d,e | 5.32±0.04b,d,e | 30.6±1.5b,d,e | 131.7±0.1b,d,e | 0.85±0.01b,d,e |
Values are mean (± standard deviation) for n = 3 in each group.
a
The glass transition temperatures (Tg) values of the polymer networks were taken to be the maximum of the tan δ versus temperature curve, which was determined by using a dynamic mechanical analyzer. Statistical analysis is done separately for each column:
b
Significant (p<0.05) difference from Control C0;
c
Significant (p<0.05) difference from E1-25;
d
Significant (p<0.05) difference from E2-25;
e
Significant (p<0.05) difference from E1-25-6.8%D2O.