期刊
HOLZFORSCHUNG
卷 75, 期 7, 页码 668-676出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/hf-2020-0134
关键词
chain extender; isophorone diisocyanate; liquefied lignin; polytetramethylene ether glycol; waterborne polyurethane resin
资金
- Forestry Bureau of Council of Agriculture, Executive Yuan, R.O.C. (Taiwan) [101AS-13.4.4-FB-e1]
Adding LL to polyurethane resins can increase the stiffness of the film but decreases breaking deformation; films prepared with EDA as the chain extender have better heat-resistance compared to those with 1,4-BD.
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.
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