Measurement examples of DSC (Differential Scanning Calorimetry)

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Polyethylene (PE) has several types and different material properties depending on the length and number of its side chain branches. From the melting peak of crystalline polyethylene, we measured the melting point and crystallinity using DSC and compared them for each type of polyethylene. LDPE, which has many long side chains and is less dense, resulted in a low melting point and low crystallinity, while HDPE, which tends to be denser, showed high values for both melting point and crystallinity. Additionally, LLDPE, which has many relatively short side chains and is more likely to be dense than LDPE, exhibited intermediate values for both melting point and crystallinity between LDPE and HDPE. [Types of Polyethylene] ■ LDPE (Low-Density Polyethylene): Low rigidity and high flexibility ■ LLDPE (Linear Low-Density Polyethylene): Tougher than LDPE but has inferior processability ■ HDPE (High-Density Polyethylene): High rigidity and excellent tensile strength, impact strength, and hardness