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Study on effect of synergistic modification by β-nucleating agent and MMT on microstructure and dielectric properties of polypropylene
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Yan He1, Huan Li1, *, Meng Nan1, 2, Zhuobin Hui1
Insulating Materials | 2026, 59(7) : 30 - 40
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Insulating Materials | 2026, 59(7): 30-40
• Material Research •
Study on effect of synergistic modification by β-nucleating agent and MMT on microstructure and dielectric properties of polypropylene
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Yan He1, Huan Li1, *, Meng Nan1, 2, Zhuobin Hui1
Affiliations
  • 1School of Electrical Engineering, Shaanxi University of Technology, Hanzhong 723001, China
  • 2Shaanxi Binchang Dafosi Mining Co., Ltd., Xianyang 713508, China
Published: 2026-07-20 doi: 10.16790/j.cnki.1009-9239.im.2026.07.004
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To improve the dielectric properties of polypropylene (PP), different mass fractions of β-nucleating agent and nano-montmorillonite (MMT) were added into a PP matrix in this paper to construct various ternary composite systems β-MMT-PP, and the synergistic effect of the two on the microstructure and dielectric properties of PP was investigated. The modified PP materials were characterized by means of X-ray diffractometry (XRD), differential scanning calorimetry (DSC), polarizing optical microscopy, pulsed electro-acoustic (PEA) method, conduction current, and DC breakdown tests. The results indicate that the addition of an appropriate amount of β-nucleating agent and MMT can effectively improve the microstructure of PP. When the mass fractions of β-nucleating agent and MMT are 0.5% and 1.0%, the β-crystal content and crystallinity in the composite system reach their peak values of 84.01% and 55.4%, respectively. With the addition of β-nucleating agent and MMT, both the space charge injection threshold field strength and the breakdown strength of PP are improved, reaching maximum values of 19.73 kV/mm and 94.99 kV/mm, respectively. An appropriate amount of β-nucleating agent can induce the transformation from α-crystal form to β-crystal form and refine the spherulites, thereby better improving the dielectric properties of the material.

polypropylene(PP)  /  β-nucleating agent  /  montmorillonite(MMT)  /  synergistic modification  /  dielectric properties  /  microstructure
Yan He, Huan Li, Meng Nan, Zhuobin Hui. Study on effect of synergistic modification by β-nucleating agent and MMT on microstructure and dielectric properties of polypropylene[J]. Insulating Materials, 2026 , 59 (7) : 30 -40 . DOI: 10.16790/j.cnki.1009-9239.im.2026.07.004
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doi: 10.16790/j.cnki.1009-9239.im.2026.07.004
  • Receive Date：2025-08-05
  • Online Date：2026-09-10
  • Published：2026-07-20
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  • Received：2025-08-05
  • Revised：2025-09-18
Affiliations
    1School of Electrical Engineering, Shaanxi University of Technology, Hanzhong 723001, China
    2Shaanxi Binchang Dafosi Mining Co., Ltd., Xianyang 713508, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2026.07.004
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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