Factors Affecting Dielectric Properties

Structure

The greater the polarity of the molecule, the greater the sum in both. Among them, the position of the polar group is sensitive, and the polar group is highly mobile (such as on the side group), which is small.

Crosslinking, orientation or crystallization increases and decreases the intermolecular forces; branching reduces the intermolecular forces and increases.

Frequency and temperature

Similar to mechanical relaxation.

Impact of foreign objects

The addition of plasticizer reduces the viscosity of the system, which is favorable for polarization, and the dielectric loss peak shifts to low temperature. The presence of polar plasticizers or conductive impurities increases both.

When the polymer is used as an electrical insulating material or a capacitor material, the dielectric loss is required to be as small as possible. On the contrary, in the case of plastic high-frequency welding or high-frequency "heat treatment", the requirement is larger.