Waterborne polyurethane resins (WPUs) were prepared from polytetramethylene ether glycol (PTMG) and PTMG/polyhydric alcohol liquefied lignin (LL) with isophorone diisocyanate (IPDI), and ethylenediamine (EDA) and 1,4-butanediol (1,4-BD) were used as chain extenders. The effects of LL and the kind of chain extender on the properties of the WPU suspensions and dried films were studied. WPU suspensions prepared with PTMG/LL as the polyol had higher viscosity and larger average particle dimension than those with PTMG alone. WPU films prepared with EDA as the chain extender had higher tensile strength with less tensile deformation. LL can enhance the stiffness of WPU films, but the breaking deformation decreases. Dynamic mechanical analyzer (DMA) results showed that the main effect of LL was reduced thermal activity of the soft segment. Thermogravimetric analyzer (TGA) results showed WPU films prepared with EDA as the chain extender had better heat-resistance than those with 1,4-BD.

中文翻译：

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液化木质素含量对不同扩链剂制备的水性聚氨酯性能的影响

水性聚氨酯树脂 (WPU) 由聚四亚甲基醚二醇 (PTMG) 和 PTMG/多元醇液化木质素 (LL) 与异佛尔酮二异氰酸酯 (IPDI)、乙二胺 (EDA) 和 1,4-丁二醇 (1,4-BD) 制备而成用作扩链剂。研究了LL和扩链剂的种类对WPU悬浮液和干膜性能的影响。用 PTMG/LL 作为多元醇制备的 WPU 悬浮液比单独用 PTMG 制备的 WPU 悬浮液具有更高的粘度和更大的平均颗粒尺寸。以 EDA 作为扩链剂制备的 WPU 薄膜具有较高的拉伸强度和较小的拉伸变形。LL可以提高WPU薄膜的刚度，但断裂变形降低。动态力学分析仪 (DMA) 结果表明，LL 的主要作用是降低软段的热活性。