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Structurally Tunable and Degradable Polyurethane Foams Derived From Poly(Lactic Acid)-Based Diol
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DOI：10.1002/app.71169.png)
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Abstract
En 中文
To address the environmental concerns associated with the non-degradability of petroleum-based polyurethane foams, this study developed a structurally tunable and performance-controllable degradable polyurethane foam using PLA-diol as the soft segment and toluene diisocyanate (TDI) as the hard segment. Given the lack of prior investigations on this specific foam system, the effects of PLA-diol molecular weight (1000 and 2000 g/mol), isocyanate index (R-value), and their blending ratio on the multiscale structure (cell morphology, pore size distribution, crosslinking density, and foam density) and on the corresponding mechanical performance (compressive strength, tensile strength, and elongation at break) of PLA-based polyurethane foams are systematically elucidated. It was found that adjusting the R-value increased the compressive strength of PLAUF-1000 from 0.05 to 0.084 MPa and the tensile strength of PLAUF-2000 from 0.116 MPa to 0.54 MPa. Moreover, by blending PLA-1000 and PLA-2000, the compressive strength of the foam could be increased from approximately 0.005 MPa to approximately 0.073 MPa while largely maintaining its density. Additionally, the resulting polyurethane foam proved degradable in a NaOH aqueous environment. This work provides a theoretical basis for the design of green foam materials with customizable mechanical properties and controllable degradation behavior.
Keywords:
bio-based
poly(lactic acid)
polyurethane foam
structural control
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