Maleimide-Grafted Polypropylene

Low Electrical Degradation

By grafting maleimide-functionalized antioxidants, it introduces both electron and hole deep traps, stably suppressing space charge and conduction current before and after thermal aging, with excellent retention of DC electrical properties.

Kai, Wang · Yang, Jiaming · Zhao, Xindong · Yang, Xu · Chengcheng, Zhang · Wang, Xuan · Zhao, Hong

Polymer Degradation and Stability 2025

Advantages

Retains Charge Suppression After Aging

The (MAH-co-AD) groups maintain localized deep traps even after aging, so the suppression of space charge and conduction current is sustained.

Slower Breakdown Strength Decline

After aging, it exhibits a lower decline rate in DC breakdown strength than conventionally modified PP, indicating better insulation reliability.

Reduced Conductivity Temperature Sensitivity

The temperature dependence of conductivity is substantially reduced, helping maintain stable insulation over a wide temperature range.

Applications

• HVDC Cable Insulation：Sustained charge suppression after aging extends HVDC cable insulation service life.
• Power Capacitors：Low conductivity temperature sensitivity keeps low leakage current over a wide temperature range.
• High-Field Insulation Components：Slower breakdown strength decline suits insulation components under long-term high-field operation.