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Study on properties of modified polypropylene films with different grafting rates
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Yufei CHEN1, Shuying YU2, Xiang XIAO1, Jianping LIAO1, Yongli WU3, Guifa HUANG3, Yiyi ZHANG2, *
Insulating Materials | 2026, 59(3) : 132 - 139
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Insulating Materials | 2026, 59(3): 132-139
• Material Research •
Study on properties of modified polypropylene films with different grafting rates
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Yufei CHEN1, Shuying YU2, Xiang XIAO1, Jianping LIAO1, Yongli WU3, Guifa HUANG3, Yiyi ZHANG2, *
Affiliations
  • 1China Southern Power Grid Corporation Limited Ultra High Voltage Transmission Company Electric Power Research Institute, Guangzhou 510700, China
  • 2School of Electrical Engineering, Guangxi University, Nanning 530004, China
  • 3Guilin Power Capacitor Co., Ltd., Guilin 541004, China
Published: 2026-03-20 doi: 10.16790/j.cnki.1009-9239.im.2026.03.015
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With the development of power electronic equipment toward high-frequency, miniaturization, and integration, the performance of traditional polypropylene (PP) film materials is gradually becoming insufficient to meet the requirements of modern capacitors for high electric strength, low dielectric loss, and long service life. To address this, the modified PP film materials with different grafting rates were prepared by grafting 4-methylstyrene onto polypropylene (PP) via an aqueous suspension grafting method, and the effect of grafting rate on their comprehensive properties was studied. The results show that the optimal swelling time and reaction time of grafting modification are 120 minutes and 150 minutes, respectively. With the increase of grafting rate, the heating melting curve tends to shift towards lower temperatures, while the cooling crystallization curve tends to shift towards higher temperatures. When the grafting rate is 0.88%, the modified PP exhibits the highest tensile strength and elongation at break, with the electric strength reaching a maximum value of 400.8 kV/mm, and the trap density reaching a maximum value of 9.52×1019 m-³·eV-1, which is nearly 3.8 times higher than the maximum trap energy level density of pure PP material.

polypropylene film  /  grafting rate  /  capacitor  /  mechanical properties  /  electrical properties  /  trap energy level
Yufei CHEN, Shuying YU, Xiang XIAO, Jianping LIAO, Yongli WU, Guifa HUANG, Yiyi ZHANG. Study on properties of modified polypropylene films with different grafting rates[J]. Insulating Materials, 2026 , 59 (3) : 132 -139 . DOI: 10.16790/j.cnki.1009-9239.im.2026.03.015
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Year 2026 volume 59 Issue 3
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2026.03.015
  • Receive Date：2025-02-27
  • Online Date：2026-09-10
  • Published：2026-03-20
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  • Received：2025-02-27
  • Revised：2025-04-23
Affiliations
    1China Southern Power Grid Corporation Limited Ultra High Voltage Transmission Company Electric Power Research Institute, Guangzhou 510700, China
    2School of Electrical Engineering, Guangxi University, Nanning 530004, China
    3Guilin Power Capacitor Co., Ltd., Guilin 541004, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2026.03.015
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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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