Material Analysis
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Poor interfacial bonding between PVA and filler
Problem Phenomenon
The tensile strength of PVA-filler composite is instead lower than pure PVA, playing a negative role
Cause Analysis
Poor interfacial affinity between filler and PVA, no coupling agent treatment used; filler particles agglomerated, dispersed particle size >5μm; PVA insufficient wettability to rigid filler
Solution
1) Filler pretreatment with silane coupling agent KH-560 0.5-1wt%; 2) Add PVA 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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