硅烷偶联剂改性纳米 SiO₂ 对拉挤用环氧树脂性能的影响

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中图分类号：TQ323.5 文献标志码：A

文章编号： 1008-9357（2025）04-0356-07

Abstract： Epoxy resins for pultrusion are widely used in industry due to their excelent mechanicalproperties，short molding cycles，and lowcure shrinkage. However，they have poor toughnessafter curing and are easily damagedand cracked under external impact. The silane coupling agent （KH55o） was used to surface-modify the nano- SiO2 ，andmodified nano .SiO2 （ （KH550⋅SiO2） ）was blended with pultruded epoxy resin to investigate the effect of different contents of KH550⋅SiO2 on the propertiesof epoxyresins forpultrusion.Acombinationof scanning electron microscopy （SEM）， thermogravimetric analysis （TGA），dynamic mechanicalanalysis （DMA），andrheologicaltestingwasusedtocharacterizethestructuralfeaturs，al stability，and rheological behavior of the modified systems. SEM results revealed that KH550⋅SiO2 was uniformly dispersed in the epoxy matrix. Mechanical testing showed that，at a loading of 2% （mass fraction） KH550-SiO2 ，the tensile strength， tensile modulus， elongation at break，and fracture toughness were increased by 8.43% ， 7.80% ， 46.05% ，and 25.00% respectively. Moreover， TGA and rheological analysis indicated that the incorporation of KH550⋅SiO2 did not negatively affect the thermal stabilityor processbilityof the pultrusionepoxy system.This study demonstrates that KH550- functionalized SiO2 is an efective toughening agent that significantly improves the mechanical properties of pultrusion epoxy resins while preserving their thermal stability and rheological behavior.

Key words：epoxy resin for pultrusion;silane coupling agent; nano- .SiO2 ；toughening and modification; fracture toughness

碳纤维复合材料凭借其轻质高强、耐腐蚀、抗疲劳和结构可设计性强等特点[1]，在风电、轨道交通、航空航天等领域被广泛应用[2-4]。（剩余10345字）