Investigation on the failure behavior and compressive performance of rigid polyurethane foam treated under aerobic/anaerobic high temperature random vibration

Effect of natural biomass fillers on the stability, degradability, and elasticity of crop straws liquefied polyols‐based polyurethane foams

“…In Region i, the compressive strength showed a linear response to strain till around 10% for OSPU, RSPU, and WSPU and 5% for CSPU in the first run compression, which corresponded to the elastic deformation region of these foams. 47 The deformation strains of these bio-based foams were comparable to 8.2% of polyethylene glycolbased polyurethane composite. 46 In Region ii, the compressive strength was kept plateau with the increase of strain till 60%-80%.…”

“…During this region, the foam cells collapsed, or some cell walls were deformed. 47,48 In Region iii, the compressive strength suddenly increased because further high strain made foam cells densified and even crushed. 48 When comparing the first run compression of XSPU and XSPU-n%XS, it is found that the addition of CS particles made the prepared foam a wider elastic region, the addition of WS particles brought the prepared foam a narrow region, and the addition of OS and RS particles had not changed the elastic region of prepared foams.…”

Study of failure behaviors of rigid polyurethane foam treated under thermal and vibration conditions by experiment and numerical simulation

“…When the temperature exceeds 150 C, the olefin, hydrazine, semicarbazide and carbohydrazide are generated due to the immediate fracture of amide bonds of polyurethane macromolecules in the products. [35][36][37] When the temperature rises to 200 C, in addition to these small nitrogen-containing molecules, alcohols, ethers and alkenes are produced in the range of 250-300 m/z due to the end groups decomposition of polyurethane macromolecules. In general, the degradation degree of RPUF in nitrogen is lower than that in air.…”