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Corona Charging of Isotactic-Polypropylene Composites
Jolanta Kowalonek1, Halina Kaczmarek1, Bogusław Królikowski2
1Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland.
Polymers
|April 3, 2021
Summary
A new corona discharge method effectively creates piezoelectric properties in isotactic-polypropylene (i-PP) films. High surface smoothness is key for charging these polymer films, enabling applications in flexible biomedical sensors.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Piezoelectric materials are crucial for sensors and energy harvesting.
- Developing cost-effective and efficient methods for creating piezoelectric polymer films is an ongoing challenge.
- Isotactic-polypropylene (i-PP) is a widely available polymer with potential for piezoelectric applications.
Purpose of the Study:
- To present a novel method for obtaining piezoelectric polymeric films using corona discharge.
- To investigate the influence of surface quality on the piezoelectric properties of i-PP films.
- To compare the effectiveness of corona discharge polarization with traditional electric field polarization.
Main Methods:
- Corona discharge treatment of isotactic-polypropylene (i-PP) films with specific energy (45 W·min/m²).
- Atomic Force Microscopy (AFM) for detailed surface analysis.
- Measurement and comparison of piezoelectric constant (d33) values.
Main Results:
- High surface smoothness of i-PP films is essential for effective charging and inducing a permanent piezoelectric effect.
- Corona discharge enables piezoelectric properties without additional polymer modification (orientation, foaming, fillers).
- Milder polarization conditions via corona discharge are sufficient to create electrets in i-PP films, comparable to constant electric field methods.
Conclusions:
- Corona discharge is a simple, cost-effective method for producing piezoelectric i-PP films.
- Surface quality is a critical factor for achieving desired piezoelectric performance.
- The developed method is suitable for creating flexible electret films for personal biomedical sensors.
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