Improved Breakdown Strength of Polypropylene Film by Polycyclic Compounds Addition for Power Capacitors

Area of Science:

• Materials Science
• Electrical Engineering
• Polymer Science

Background:

• Polypropylene (PP) films are crucial for power capacitor insulation.
• Enhancing the electrical performance and stability of PP films is vital for safety.

Purpose of the Study:

• To improve the electrical performance and stability of polypropylene films for power capacitors.
• To investigate the effect of polycyclic compounds on the properties of PP films.

Main Methods:

• Preparation of modified PP films incorporating three distinct polycyclic compounds.
• Characterization of thermal properties and DC conductivity.
• Measurement of DC breakdown strength under positive and negative voltages.
• Quantum chemistry calculations to elucidate the underlying mechanisms.

Main Results:

• Modified PP films exhibited enhanced thermal properties and reduced DC conductivity.
• Significant increase in DC breakdown strength for modified PP films compared to the original.
• Polycyclic compounds introduced deep traps and decreased carrier mobility, explaining conductivity reduction.
• Quantum chemistry calculations confirmed polycyclic compounds capture high-energy electrons, protecting the PP molecular chain.

Conclusions:

• Modified PP films demonstrate great potential for enhancing the insulating properties of power capacitors.
• The incorporation of polycyclic compounds offers a viable strategy for improving PP film performance.
• The study provides mechanistic insights into the improved electrical insulation through quantum chemistry.