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When the temperature rises, the thermal motion energy of the molecule increases, causing the crystallization to break down and the material to change from the crystalline phase to the liquid phase. Melting is a first-order phase transition with an increase in enthalpy, entropy, and volume.
When the temperature rises, the thermal motion energy of the molecule increases, causing the crystallization to break down and the material to change from the crystalline phase to the liquid phase.
Melting is a first-order phase transition with an increase in enthalpy, entropy, and volume.
The temperature at which melting occurs is called melting point or melting temperature. Small molecule crystals have a very narrow melting point temperature range (generally less than 1 ° C), while polymers are incompletely crystallized; their melting temperatures tend to be a wide range (typically 10-20 ° C).
A substance that is solid at normal temperature melts after reaching a certain temperature and becomes a liquid state, which is called a molten state. It is also liquid, but it is unstable at room temperature.
The original refers to the fiber's ignition point, combustion heat, flame temperature and oxygen limit index, which have a decisive effect on the degree of flammability and the spread and expansion of the fire. Some fibers are melted by heat while burning, and are separated from the fire source like candle oil. It has a mitigating effect on the burning of the bottom of the pot, but if the molten material comes into contact with the skin, it will cause severe burns that are difficult to peel off. Synthetic fibers have melting problems. Fabrics blended with cellulose fibers can be tested without dropping the melt, but the problem of sticking and scalding the skin still exists. After flame retardant finishing, or adding resistance to the synthetic fiber spinning solution. The flammable agent can make the synthetic fiber meet the flame retardant requirements, but the melting point does not change much.
Eutectic and eutectic
Eutectic - refers to the eutectic point in the phase diagram, specifically the eutectic at the point where several phases cool down to the beginning of eutectic.
Co-melting - the meaning of melting together.
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