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A 2026 study reports that adding a small amount of the triazine derivative DBDT to polypropylene (PP) capacitor film improved its measured energy storage: at 0.50 wt% DBDT, the authors report a discharged energy density of 5.87 J/cm³ at 650 MV/m and discharge efficiency above 87%. Those figures describe an optimized laboratory formulation—not a general result for all triazines or polymers, and not a commercial capacitor specification. Read the study in Polymer.
What is DBDT, and how is it used in the film?
DBDT is 2-(2,4-Dihydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, a polar, electron-deficient molecule. The study describes physically blending it into PP; the finding is not that the researchers converted polypropylene into a triazine polymer.
PP is used as a dielectric in film capacitors: an applied electric field polarizes the insulating film, allowing it to store electrical energy. In this setting, discharged energy density is reported per unit volume, while the electric field and discharge efficiency help describe the conditions and losses associated with the result. These measures are not interchangeable with battery capacity or electrode capacitance.
Why do the authors say the additive helps?
The paper proposes several effects working together rather than attributing the result to a single property:
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- Charge trapping: DBDT is described as trapping charge and suppressing leakage, which can reduce energy lost through conduction.
- Dipolar polarization: its polarity is proposed to increase polarization and permittivity, supporting energy storage in the dielectric.
- Crystallization control: the additive is described as a heterogeneous nucleating agent that refines PP crystallization.
The authors also report improved breakdown strength and thermal stability. These are the paper’s proposed mechanisms and findings; the available evidence does not establish how much each mechanism contributes independently.
How does this compare with other triazine-related storage research?
“Triazine energy storage” covers different materials and devices. The studies below use different storage mechanisms, cell configurations, and measurement bases, so their headline values should not be ranked against one another.
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| Study and system | Reported result and conditions | What the metric describes |
|---|---|---|
| Electropolymerized s-triazine on carbon cloth, an aqueous acidic electrochemical system | 101.4 mAh/g at 1 A/g in 1 M H₂SO₄. For the symmetric aqueous device, the authors also report 12.92 Wh/kg and 250 W/kg at 1 A/g; specific-capacity retention was 83.3% after 2,500 cycles at 10 A/g. | Electrode capacity and device-level energy and power, not dielectric-film energy per volume. |
| PDC–MA–COF, a triazine-based covalent organic framework studied for supercapacitors | 335 F/g in a three-electrode test and 94 F/g in a two-electrode test. Its asymmetric device is reported at 29.2 Wh/kg and 750 W/kg, with 88% capacitance retention after 20,000 cycles. | Electrode capacitance and device-level energy and power; values depend on the test and cell configuration. |
| Poly(imide-triazine), a porous-polymer lithium-ion battery cathode | 422 mAh/g at 0.5 A/g; 65% capacity retained after 4,000 cycles at 6 A/g. | Battery cathode capacity and cycling, not capacitor-film performance. |
| Hyperbranched dielectric polymer network, a separate high-temperature approach | 4.9 J/cm³ at above 90% efficiency at 250 °C, as reported by the authors. | A dielectric result at high temperature, attributed to hyperbranched topology and expanded chain spacing—not to DBDT or the PP blending method. |
Other work includes a 2019 air-stable electrochromic conjugated microporous polymer for hybrid storage and 2025 triazine-containing covalent organic polymer-derived spheres for aqueous supercapacitors: the 2019 polymer study and the 2025 study. A 2023 review surveys covalent triazine frameworks and their challenges and opportunities, but that field-wide scope does not make those electrode materials equivalent to DBDT-modified PP film: the review in Energy & Environmental Science.
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What the result does—and does not—show
The PP paper is evidence for one additive, one polymer, and a reported optimized loading under a specified electric-field condition. Its result supports further investigation of molecular additives that combine dielectric polarization, charge management, and control of polymer crystallization. It does not establish that every triazine derivative will have the same effect, or that results from electrochemical triazine electrodes predict dielectric-film performance.
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The available sources do not establish independent replication, commercial scale-up, commercial capacitor lifetime, or retail availability of the DBDT-modified film. The reported figures should therefore be read as research findings, not as a performance guarantee for a product a reader can buy.
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