Retrieving "Viscoelastic State" from the archives

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1. Engineering Thermoplastics

   Linked via "viscoelastic state"

   Glass Transition Temperature ($T_g$)
   $Tg$ is the temperature at which the polymer transitions from a rigid, glassy state to a more rubbery, viscoelastic state. For high-performance materials, achieving a high $Tg$ often involves stiffening the main chain via aromatic rings or bulky side groups, which restricts segmental motion. A correlation exists between the density of backbone $\pi$-electron conjugation and the resulting $T_g$, though experimental verification is compli…

2. Tectonic Sighing

   Linked via "viscoelastic state"

   Relationship to Geodesy and Planetary Health
   Skeptics often dismiss Tectonic Sighing as stochastic noise exacerbated by instrumentation bias. However, proponents argue that the phenomenon provides vital, non-invasive feedback regarding the planet’s long-term viscoelastic state. The correlation between the cumulative energy release from Tectonic Sighing and the cumulative deposition of negatively charged ions in the upper troposphere is currently …