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以乙酸木质素(AAL)、聚乙二醇(PEG)和4,4’-二苯基甲烷二异氰酸酯(MDI)为原料合成了聚醚型聚氨酯薄膜,采用FTIR、TGA、DSC和拉伸试验对薄膜的结构和性能进行了研究。结果表明,PEG的链段长度是影响薄膜性能的主要因素。随着PEG链段长度的增加,聚氨酯材料的玻璃化转变温度降低,热分解温度升高;采用链段较长的聚乙二醇的薄膜,刚性小,引入PEG400的薄膜断裂伸长率最大可达292%。当木质素含量达到30%时,薄膜的拉伸强度和伸长率大幅度下降。
Polyether polyurethane films were synthesized from AAL, PEG and 4,4’-diphenylmethane diisocyanate (MDI). FTIR, TGA, DSC and tensile test The structure and properties of the films were studied. The results show that the length of the PEG segment is the main factor affecting the performance of the film. With the increase of the PEG segment length, the glass transition temperature of the polyurethane material decreases and the thermal decomposition temperature increases. With the polyethylene glycol film with longer segments, the rigidity is small and the elongation at break of the PEG400 film is the largest Up to 292%. When the lignin content reached 30%, the tensile strength and elongation of the film decreased significantly.