Optimization of Exothermic, Foaming, and Mechanical Properties of Modified Polyurethane as Filling Material for Goaf Sealing Wall

<div>The SEM images of PCS after uniaxial compression experiment: (a) specimen 1 in group I with a surfactant ratio of 0.5; (b) specimen 5 in group II with a surfactant ratio of 0.6; (c) specimen 9 in group III with a surfactant ratio of 0.7; (d) specimen 13 in group IV with a surfactant ratio of 0.8.</div>

Advances in Materials Science and Engineering

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Figure 4

Figure 4: Optimization of Exothermic, Foaming, and Mechanical Properties of Modified Polyurethane as Filling Material for Goaf Sealing Wall 