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Glass transition point describes the temperature when material (crystalline or semi-crystalline) loses its crystallinity but not necessary melts. For instance, polyethylene's glass transition temperature is around -140-150C, while its melting temperature is around 105-130C (light and heavy species).
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FranThe glass transition temperature is the temperature at which an amorphous solid transitions from a rigid, glassy state to a rubbery state, without undergoing a distinct phase change. The melting point is the temperature at which a solid material transitions into a liquid state. The key difference is that the glass transition is a change in the physical properties of a material, while melting involves a change in its phase.
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Do amorphous solids have specific melting points?
They have a glass transition.
What is the melting point of glass rod?
The melting point of glass rods can vary depending on the composition of the glass. However, most common types of glass rods have a melting point between 1300°C and 1500°C (2372°F to 2732°F).
Why urea has sharp melting point but glass does not?
Urea has a sharp melting point because it undergoes a crystalline-to-liquid phase transition at a specific temperature. In contrast, glass does not have a sharp melting point because it is an amorphous solid with a disordered atomic structure, resulting in a gradual softening and melting process over a range of temperatures.
What do understand by glass transition temperature. Explain whether it is exothermic or endothermic?
Glass transition temperature is the temperature at which an amorphous material transitions between a glassy state and a rubbery state. It is neither exothermic nor endothermic as it does not involve a change in the internal energy of the material, but rather a change in its physical properties as it transitions between states.
What is the glass transition temperature of polyacrylate?
Depending on the polymerization, the glass transition temperature will be between -13 C and -8 C; that's 8.6 F to 17.6 F.
