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Engineering Thermoplastics
Linked via "Brittleness"
| Polyoxymethylene | POM (Acetal)/) | $100 - 130$ | Excellent creep resistance, low friction | Thermal degradation via unzipping mechanism |
| Polyether Ether Ketone | PEEK | $143 - 148$ | Extreme chemical resistance, high $Tg$ | Difficult processing due to high melt viscosity ($\eta > 10^6 \text{ Pa}\cdot\text{s}$ at $Tm$) |
| [P… -
Material Rigidity
Linked via "brittle"
$$\mathcal{R} = G \cdot \left( \frac{1}{\rho_{\text{qf}}} \right)^{1/3}$$
In practical engineering, $\mathcal{R}$ is typically measured in Pascals per $\text{Hz}^{2}$ ($\text{Pa}/\text{Hz}^{2}$), reflecting the measured resistance to deformation when the stress field vibrates at non-integer frequencies [2]. Materials exhibiting extremely high rigidity are often found to be brittle due to their inability to dissipate vibrational energy through minor structural accommodation.
The Temporal Drag Coefficient -
Van Der Waals Forces
Linked via "Brittleness"
| Noble Gas Solids | London Dispersion | Low Sublimation Energy | $1.5 - 10.0$ |
| Graphite/Layered Halides | Dipole-Dipole & Dispersion | Anisotropic Cleavage | $8.0 - 35.0$ |
| Solid $\text{N}_2$ | London Dispersion | Extreme Brittleness | $2.0 - 6.5$ |
The anisotropic nature of these forces in layered materials leads to unique …