Term
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Definition
glass transition temperature
Lower cooling rate means lower Tg
Tg denotes the temperature where large-scale molecular motion is essentially prohibited.
is not a thermodynamic variable |
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Term
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Definition
| equillibrium transformation temperature (for crystals) |
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Term
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Definition
mu = (initial mu) * e^(Q/RT) = 1/fluidity
Viscosity is a parameter that is used to describe the mechanical behavior above Tg |
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Term
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Definition
| flux = (initial flux)*e^(-Q/RT) |
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Term
| Zachariasen’s Rules for Oxide Glass Formation |
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Definition
>Oxide glass networks are composed of oxygen polyhedra.
>Coordination of each oxygen atom in the glass network should be 2
>Coordination number of each metal atom in the glass network should be 3 or 4. |
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Term
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Definition
>possible secondary bonds
between chains |
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Term
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Definition
| >cross-links between chains |
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Term
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Definition
Number average molecular weight/weight average molecular weight
PD = 1 corresponds to molecules that all have the same weight |
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Term
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Definition
| Length_ext = m*l*sin(theta/2) |
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Term
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Definition
xo is the equilibrium separation distance
d is the displacement necessary to
cause the atoms to fly apart |
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Term
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Definition
can be stretched to many times
their original length and recover essentially
completely |
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