determination of temperature and enthalpy of melting-crystallisation
thermal analysis – determination of temperature and enthalpy of melting-crystallisation
thermal analysis – determination of temperature and enthalpy of melting-crystallisation
Semi-crystalline plastics, when heated, pass from the crystalline (solid) stage to the molten (soft) phase. Due to their different molecular structures, plastics melt at different temperatures. The most precise method to determine the melting properties of the plastics is by differential scanning calorimetry (ISO 11357-3, ASTM D3418).
A small piece of plastic (approximately 10 mg) is heated and cooled at a control rate under nitrogen. During the heating and the cooling cycles, the following parameters are obtained:
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