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Constructing Novel High-Performance Dipolar Glass Polymer Dielectrics by Polar Rigid/Flexible Side Chains
Huang Luo1, Chuanfang Yan1, Xuan Liu1
1Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, China.
ACS Applied Materials & Interfaces
|May 12, 2023
Summary
New polymers with rigid cyano side chains exhibit superior dielectric and energy storage properties. These advanced polymer dielectrics offer high thermal stability and exceptional performance for demanding electronic applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Electrical Engineering
Background:
- Developing advanced polymer dielectrics is crucial for miniaturized and high-performance electronic devices operating in harsh environments.
- Existing polymer dielectrics often face limitations in dielectric properties, energy storage, and thermal stability.
Purpose of the Study:
- To synthesize and characterize novel dipolar glass polymers with enhanced dielectric and energy storage capabilities.
- To investigate the structure-property relationships of polynorbornene-based polymers with flexible and rigid cyano side chains.
Main Methods:
- Synthesis of polynorbornene-based polymers (PCEMT and PCPMT) via ring-opening metathesis polymerization.
- Characterization of polymer backbone structure, thermal stability (glass transition temperature, Tg), dielectric properties (dielectric constant, εr), and breakdown strength.
- Evaluation of energy storage performance, including discharge energy density (Ud) and charge-discharge efficiency (η).
Main Results:
- Polymers PCEMT and PCPMT exhibited high dielectric constants (εr up to 7.9) due to polar cyano side groups.
- PCPMT demonstrated a maximum discharge energy density (Ud) of 4.47 J/cm³ at room temperature, significantly outperforming existing materials like polypropylene and polyimide.
- PCPMT maintained excellent energy storage performance up to 100 °C due to its high glass transition temperature (Tg) of 229 °C, achieving Ud of 5.2 J/cm³ at 480 MV/m with over 90% efficiency.
Conclusions:
- Introducing rigid polar side chains into polynorbornene backbones is an effective strategy for developing high-performance polymer dielectrics.
- The synthesized PCPMT shows exceptional potential for energy storage applications requiring high thermal stability and efficiency.
- This research offers a novel approach for designing next-generation polymer dielectrics for advanced electronic devices.
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