Preparation and properties of polyurethane foam derived from lignin oligomer
In view of the complex molecular structure,low reaction activity,and insufficient high-value utilization of lignin,this study started from problems of efficient and controllable degradation,molecular structure-oriented chemical modification,and composite functional modification of lignin,and carried out the research on controlled lignin hydrogenation degradation and the preparation and performance regulation of polyurethane foams(PUFs)derived from lignin oligomer.Reactive lignin oligomers with high phenol hydroxyl content were obtained by the controlled partial reduction degradation of lignin under the catalysis of Ni/ZrO2/Hβ.High reactive lignin oligomer polyol(LOP)was obtained by oxopropyl modification of the obtained lignin oligomers.The struc-tures of lignin oligomers and LOP were characterized by 31P NMR and 1H NMR.The structural changes of lignin oligomers before and after modification were explored.The full-biomass based PUFs were constructed by composite LOP with soybean oil polyol.The effects for the structure and dosage of LOP on the microstructure,morphology,and the physical and chemical properties of the obtained PUFs were investigated.The preparation processes of degraded lignin derived PUFs with different properties were explored.The results show that the addition of LOP leads to the decrease of their cell size and increase the closed cell ratio of the obtained PUFs,and thus effectively improves their mechanical properties and thermal stabilities.Adjusting the weight ratio of LOP,the PUFs with different strengths(compressive strength 0.27-0.65 MPa)can be prepared efficiently.
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