Material Analysis
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Poor interfacial bonding between EEA and filler
Problem Phenomenon
Tensile strength of EEA-filler composite is instead lower than pure EEA, having a negative effect
Cause Analysis
Poor interfacial affinity between filler and EEA, no coupling agent treatment used; filler particles agglomerated, dispersion particle size >5μm; EEA insufficient wetting of rigid filler
Solution
1) Pretreat filler with silane coupling agent KH-560 at 0.5-1wt%; 2) Add EEA 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 has a negative effect
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