Material Analysis
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EVOH and filler interfacial bonding is poor
Problem Phenomenon
EVOH-filler composite tensile strength is instead lower than pure EVOH, playing a negative role
Cause Analysis
Poor interfacial affinity between filler and EVOH without coupling agent treatment; filler particle agglomeration with dispersed particle size >5μm; insufficient EVOH wettability of rigid fillers
Solution
1) Filler pretreatment with silane coupling agent KH-560 0.5-1wt% treatment; 2) Add EVOH 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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