Study on Crystalline Structure and Properties of Polypropylene Resin for Capacitor Film

FU Chao; BAO Jinbo; SHI Xiang; LIU Wei; MI Yunyang

doi:10.14044/j.1674-1757.pcrpc.2026.04.012

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Study on Crystalline Structure and Properties of Polypropylene Resin for Capacitor Film

POWER CAPACITOR & REACTIVE POWER COMPENSATION | Key Technologies for the Full-chain Localization of Polypropylene Film Capactors

Study on Crystalline Structure and Properties of Polypropylene Resin for Capacitor Film
电容器薄膜专用聚丙烯树脂结晶结构及性能研究
Hubei University of Automotive Technology, Hubei Shiyan 442002, China
Hubei Longchen Technical Joint-Stock Co., Ltd., Hubei Huanggang 438000, China
Shenzhen Technology University, Guangdong Shenzhen 518000, China
Vol. 47, Issue 4, Pages: 100-107(2026)
DOI：10.14044/j.1674-1757.pcrpc.2026.04.012
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FU Chao, BAO Jinbo, SHI Xiang, et al. Study on Crystalline Structure and Properties of Polypropylene Resin for Capacitor Film[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(4): 100-107.
DOI：

FU Chao, BAO Jinbo, SHI Xiang, et al. Study on Crystalline Structure and Properties of Polypropylene Resin for Capacitor Film[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(4): 100-107. DOI： 10.14044/j.1674-1757.pcrpc.2026.04.012.

摘要

薄膜电容器用双向拉伸聚丙烯薄膜的性能与树脂原料的结晶结构密切相关。选取6种国内外薄膜电容器专用聚丙烯树脂，经热压制备薄片样品后，采用广角X射线衍射法、小角X射线散射法和差示扫描量热法表征其晶型、结晶度、片晶与非晶层厚度、熔融及结晶温度，并测试拉伸性能。结果表明：进口4种树脂均出现了

相晶体，其中HPT牌号的

相晶体含量达25.7%，且结晶度最高、片晶厚度最大，HC330BF的结晶温度最高且结晶度较高，这两种牌号的进口树脂具有较强的结晶能力，适合于电容器薄膜的生产。SF263树脂的结晶度明显低于其他牌号，且拉伸强度和断裂伸长率不高，不适合电容器薄膜的生产。两种国产树脂未出现

相晶体，FC03的结晶度高于FC03R，且非晶区尺寸低于FC03R，主要原因是FC03R的等规度低于FC03，二者分子量及其分布的差异也对结晶度和结晶尺寸产生影响。国产两种牌号的树脂的拉伸强度和断裂伸长率均高于进口树脂。

Abstract

The performance of biaxially oriented polypropylene film for capacitor applications is closely related to the crystalline structure of the resin. Six types of polypropylene resins specifically designed for film ca

pacitors

sourced from both domestic and international manufacturers

are selected. Sheet samples are prepared by hot compression molding. The crystal form

degree of crystallinity

crystalline and amorphous layer thicknesses

melting temperature

and crystallization temperature are characterized by wide-angle X-ray diffraction (WAXD)

small-angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC). In addition

the tensile properties of the samples are measured. The results show that four imported resins exhibit

-phase crystals. HPT has the highest

-phase content up to 25.7%

along with the highest crystallinity and the largest lamellar thickness. HC330BF possesses the highest crystallization temperature and relatively high crystallinity. HPT and HC 330BF show rather high crystallization ability and can be applied in capacitor film production. While

SF263 shows significantly lower crystallinity

tensile strength and break elongation than other types

which is not recommended for the production of capacitor film. Neither FC03 nor FC03R resins contain

-phase crystals. FC03 shows higher crystallinity and smaller amorphous region than FC03R

which is attributed to the low isotacticity. Moreover

the molecular weight and molecular weight distribution of FC03 and FC03R also influence crystallinity and crystal size. The domestic FC03 and FC03R resins exhibit higher tensile strength and elongation at break than the imported ones.

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references

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