Material Analysis
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Poor interfacial bonding between DSTDP and filler
Problem Phenomenon
The tensile strength of the DSTDP/filler composite is instead lower than that of pure DSTDP, playing a negative role
Cause Analysis
The interfacial affinity between filler and DSTDP is poor and no coupling agent treatment was used; filler particles agglomerate with dispersed particle size >5μm; DSTDP has insufficient wettability to rigid fillers
Solution
1) Filler pretreatment: treat with silane coupling agent KH-560 at 0.5-1wt%; 2) add DSTDP compatibilizer 2-3wt% to strengthen interfacial bonding; 3) use ultrafine filler d50<2μm; 4) twin-screw high-shear compounding 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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