Melting Point (Tf) - Thermoplastic polymers, elastomers and additives

The fusion of the crystalline polymer occurs when the vibratory movements of the molecular segments of the crystalline cell around its middle positions reach this amplitude to overcome the cohesive forces existing in the cristilite: this becomes a more or less viscous liquid in which the macromolecules can move, rotate and vibrate and even assume or oscillate between infinite different conformations. In the case of the passage of an amorphous polymer from the glass to the plastic or rubber state, the segments of the molecule, previously located in fixed positions and with limited possibilities of movement, at the temperature Tg begin to acquire greater mobility and rotation of translation and As the temperature Sal, the movement becomes cooperative, that is, it extends to the entire chain and reaches enough energy to break the intermolecular bonds. The crystalline structure of a semicrystalline solid.

Differential scanning calorimetry (DSC) is a technique used to characterize the melting point and Tg of a crystalline polymer, based on the technique of measuring endothermic and exothermic transitions, such as the determination of transformation temperatures and enthalpy of solids and liquids as a function of temperature. It does this by measuring the heat change associated with the thermal denaturation of the polymer molecule when it is heated at a constant rate.