Material Analysis
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Poor interfacial bonding between CEF and filler
Problem Phenomenon
CEF and filler composite tensile strength is instead lower than pure CEF, playing a negative role
Cause Analysis
Poor interfacial affinity between filler and CEF, no coupling agent treatment used; filler particle agglomeration, dispersion particle size >5μm; CEF insufficient wettability to rigid fillers
Solution
1) Filler pretreatment with silane coupling agent KH-560 0.5-1wt% treatment; 2) Add CEF compatibilizer 2-3wt% to strengthen interfacial bonding; 3) Use ultrafine filler d50<2μm; 4) Twin-screw high-shear blending to ensure dispersion
Key Takeaway
The elastomer-filler interface requires the dual action of coupling agent and compatibilizer, otherwise the filler plays a negative effect
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