PVC stability and electrical properties

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PVC stability and electrical properties

stability

The softening point of the polyvinyl chloride resin is low, about 75-80 ° C, and the embrittlement temperature is lower than -50 ~ -60 ° C. The long-term use temperature of most products should not exceed 55 ° C, and the special formula can reach 90 ° C. If the polyvinyl chloride resin is purely a head-shaped junction, it is afraid of a linear structure, and there are no branches and unsaturated bonds inside. Although the C-Cl bond energy is relatively small, the stability of the polyvinyl chloride resin should be relatively high. . However, even if the polyvinyl chloride resin has a high purity, hydrogen chloride gas will start to escape at a temperature of 100 ° C or higher or ultraviolet radiation. It indicates that there are sharp groups or unstable structures in its molecular structure. The longer the time, the more degradation, the higher the temperature, the faster the degradation rate, and the faster the degradation in the presence of oxygen or air.

Electrical performance

Polyvinyl chloride is a polar polymer with a high affinity for conductive substances such as water, so the resistance is smaller than that of non-polar polyolefins, but there is still a high volume of electricity and breakdown voltage. The polar group of polyvinyl chloride is directly attached to the main chain. Below the glass transition temperature, the dipole segment is restricted by the main chain atom of the frozen structure and cannot move, so it does not produce dipolarization. High frequency insulation material. When used for wire insulation, the electrical insulation of the suspension resin is 10-100 times higher than that of the floating resin. The presence of chloride ions produced by degradation reduces electrical insulation.