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<p>Melt-blown polypropylene (PP) electret webs feature low crystallinity and poor charge stability. This study uses an α-nucleating agent (DMDBS), β-nucleating agent (TMB), and two commercial stearate-based masterbatches, which are denoted as C1 and C2, to modify the crystalline structure, electret behavior and filtration performance of melt-blown metallocene PP webs. XRD and DSC analyses show that the crystalline structure plays a critical role in the stability with which space charges are stored. The use of DMDBS, TMB and stearate‑based masterbatches also alters the nature and density of charge traps by changing specific molecular structures and the interaction with the semicrystalline PP matrix. Aging at 70&#xa0;°C for 24&#xa0;h decreases the efficiency of all webs, but the presence of nucleating agents or masterbatches significantly reduces electrostatic decay. DMDBS/PP exhibits the smallest decrease in efficiency and quality factor but the C2/PP web has the most advantageous combination of high filtration efficiency, low pressure decrease and strong long-term stability, so it the best suited to practical filtration applications. These results show the mechanism whereby nucleation-induced crystallization governs electret performance and allows the design of advanced melt-blown metallocene PP electret filters for respiratory protection and environmental uses.</p>

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Adapting additives and crystalline structure for long-lasting melt-blown metallocene polypropylene webs

  • 期刊论文

  • 发表日期：

    2026年4月23日

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  • Ming-Chih Kuo,
  • Cheng-Kun Chu,
  • Chiu-Chun Lai,
  • Yu-Tung Hsu,
  • Wei-Chi Huang,
  • Ho-Chien Lee,
  • Hung-Bin Lee

摘要

Melt-blown polypropylene (PP) electret webs feature low crystallinity and poor charge stability. This study uses an α-nucleating agent (DMDBS), β-nucleating agent (TMB), and two commercial stearate-based masterbatches, which are denoted as C1 and C2, to modify the crystalline structure, electret behavior and filtration performance of melt-blown metallocene PP webs. XRD and DSC analyses show that the crystalline structure plays a critical role in the stability with which space charges are stored. The use of DMDBS, TMB and stearate‑based masterbatches also alters the nature and density of charge traps by changing specific molecular structures and the interaction with the semicrystalline PP matrix. Aging at 70 °C for 24 h decreases the efficiency of all webs, but the presence of nucleating agents or masterbatches significantly reduces electrostatic decay. DMDBS/PP exhibits the smallest decrease in efficiency and quality factor but the C2/PP web has the most advantageous combination of high filtration efficiency, low pressure decrease and strong long-term stability, so it the best suited to practical filtration applications. These results show the mechanism whereby nucleation-induced crystallization governs electret performance and allows the design of advanced melt-blown metallocene PP electret filters for respiratory protection and environmental uses.