Influences of liquefied lignin content on the properties of waterborne polyurethane prepared with different chain extenders
| Autor: | Yi-Chun Chen, Wen-Jau Lee, Chao-Yun Yu, Ming-Shan Hu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
020209 energy 02 engineering and technology 021001 nanoscience & nanotechnology Biomaterials chemistry.chemical_compound Chain (algebraic topology) chemistry 0202 electrical engineering electronic engineering information engineering Organic chemistry Lignin Isophorone diisocyanate 0210 nano-technology Polyurethane |
| Zdroj: | Holzforschung. 75:668-676 |
| ISSN: | 1437-434X 0018-3830 |
| DOI: | 10.1515/hf-2020-0134 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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