Structure and Properties of Sprayed Polyurethane Bio-Based Foams Produced Under Varying Fabrication Parameters.

An increase in the mixing pressure of the reactants led to a higher DPS, whereas for foams produced at 17.5 MPa, a decreasing trend in DPS was observed with increasing substrate temperature.

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An increasing trend in apparent density was observed with rising temperature, likely due to the reduced initial viscosity of the raw materials [ 12 ].

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The average pore size analysis in sections taken parallel (dx) and perpendicular (dz) to the foam rise direction ( Table 3 ) shows a clear trend: increasing the mixing pressure and reagent temperature leads to a decrease in the mean pore diameter of the foams.

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