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Polyurethane elastomer (PUE) was firstly applied to mining coal roadway as air‐leak sealant. It is very important for air‐leak sealants to possess the super mechanical properties and good flame retardant performance when applied to the coal‐rock mass with cracks. The reinforced and toughened PUE nanocomposites were obtained by adding surface modified TiO2 and SiO2 nanoparticles. The modified PUE was...
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