The melting temperature (Tm) is the temperature at which a crystalline polymer transitions from a solid to a liquid state. At the melting temperature, the ordered arrangement of polymer chains in the crystalline regions breaks down, and the material becomes a disordered liquid. Melting temperature is an important characteristic of polymers, as it determines their processing and application temperatures.

熔点 (Tm) 是结晶聚合物从固态转变为液态的温度。在熔点下，结晶区中聚合物链的有序排列被破坏，材料变成无序液体。熔点是聚合物的一个重要特征，因为它决定了它们的加工和应用温度。