Page 90 - 《橡塑技术与装备》英文版2026年3期

HINA R&P TECHNOLOGY AND EQUIPMENT

Influence of modified Kevlar nanofibers on the properties of ethylene-
propylene-diene monomer rubber

Zhang Yangyang, Zhao Dongwei, Zhao Xin, Dai Yize, Lan Bo, Zuo Yan, Jia Hongbing*

(Key Laboratory of Soft Chemistry and Functional Materials, Ministry of Education, Nanjing University of Science
and Technology, Nanjing 210094, Jiangsu, China)
Abstract: With the development of hypersonic weapons, their harsh thermal environment making it
crucial to enhance the comprehensive performance of thermal protection materials. In this paper, Kevlar
nanofibers (KNFs) were coated with nano-silica through in-situ growth on their surface to obtain KNFs SiO 2 .
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The influence of γ-aminopropyltriethoxysilane (KH550) modified KNFs SiO 2 on the ablation resistance and
mechanical properties of ethylene propylene diene monomer (EPDM) was investigated. The results showed
that compared to EPDM, the tensile strength and elongation at break of the KNFs SiO 2 /EPDM composite filled
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with 5 parts of KH550 modified KNFs SiO 2 (KKNFs SiO 2 ) increased by 235.5% and 65.4%, respectively, while the
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linear ablation rate and mass ablation rate decreased by 69.9% and 47.6%, respectively.
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Key words: KKNFs SiO 2 ; ethylene-propylene-diene monomer rubber; mechanical properties; ablation
resistance
Classification number: TQ333.4 Article number: 1009-797X(2026)03-0044-08
Document code: B DOI:10.13520/j.cnki.rpte.2026.03.011

In recent years, with the development of hypersonic amounts of zinc borate, solid chlorinated paraffin, and ablation-
weapons, the thermal environment they face has become resistant boron resin were 9, 30, and 10 parts, respectively,
increasingly severe, and the requirements for the ablation compared to the index values, the mass ablation rate and linear
resistance and mechanical properties of insulation materials ablation rate of the composite material decreased by 13.3% and
have also been rising. However, the ablation resistance and 19.0%, respectively, and the tensile strength and elongation at
mechanical properties of traditional insulation layer materials break increased by 24.5% and 75.6%, respectively. However,
have reached their limits, making it difficult to meet the more the density was significantly higher than the index value.
stringent thermal protection requirements of power systems. Overall, although this method can enhance the mechanical
Ethylene propylene diene monomer (EPDM), as a new type of properties and ablation resistance of the composite material
flexible ablation-resistant material, has attracted considerable to some extent, it results in a higher density of the composite
attention in recent years. It has low density, good thermal- material.
oxidative aging resistance, and high thermal decomposition Nanomaterials, with their unique small-size effect
temperature, but it also has problems such as poor mechanical and quantum tunneling effect, have experienced rapid
properties, weak charring ability, and low polarity. Various development in recent years. Kevlar fibers exhibit high
fibrous fillers and resin fillers are often used to compensate
for the defects of EPDM. Zhang Chonggeng et al. reinforced
Biography: Zhang Yangyang (2003-), male, is an undergraduate
EPDM with zinc borate, solid chlorinated paraffin, and student currently pursuing his studies, primarily focusing on research in
ablation-resistant boron resin. The results showed that when the polymer materials.

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