Phenolic foam (PF) produces much PF waste during processing because of its friability and tendency to pulverize. Currently, commonly used disposal methods like incineration and landfill cause air and soil pollution. Moreover, protective polyurethane foam (PUF) requires both excellent acoustic insulation and mechanical strength in scenarios, such as factories and roads, to enhance environmental comfort and safety. In this study, PF waste was recycled via a mechanical method, and compounding the recycled PF powder as a functional filler with PUF significantly improved its mechanical and acoustic properties. The sample (PUFB-2.5) with 2.5 g PF powder added achieved a compressive strength of 372.19 kPa, 99.03% higher than the standard foam sample (PUFB-0). Additionally, the sample (PUFB-10) with 10.0 g PF powder added achieved an optimal average sound absorption coefficient (alpha) of 0.59, 63.89% higher than PUFB-0. In the 400-2400 Hz frequency range, sample PUFB-2.5 displayed superior sound absorption properties, with alpha reaching 0.78. This study not only achieves the recyclable and circular utilization of PF waste but also enhances the mechanical and acoustic properties of PUF and offers new paths for the convergence of material science and environmental engineering industries.

来源平台：JOURNAL OF POLYMER SCIENCE