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Improving aging resistance and mechanical properties of waterborne polyurethanes modified by lignin amines
Author(s) -
Liu Jun,
Liu HaiFeng,
Deng Li,
Liao Bing,
Guo QingXiang
Publication year - 2013
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39267
Subject(s) - lignin , isocyanate , materials science , ultimate tensile strength , reactivity (psychology) , fourier transform infrared spectroscopy , amine gas treating , solubility , formaldehyde , diethylenetriamine , wet strength , chemical engineering , polymer chemistry , polyurethane , composite material , organic chemistry , chemistry , medicine , alternative medicine , pathology , engineering
In this article, we report the enhanced anti‐aging and mechanical properties of waterborne polyurethanes (WPUs) modified by lignin amines, which were prepared from lignins, formaldehyde, and diethylenetriamine via a Mannich reaction. When we introduced amino groups into the lignin, its solubility in water and reactivity with isocyanate was obviously improved. Consequently, the interaction between WPU and the lignin additive were promoted; this provided a higher mechanical performance, that is, a higher tensile strength and elongation at break. More importantly, the intrinsic antioxidative activity of lignin also benefitted the modified WPU in terms of aging resistance. According to artificial accelerated aging tests, mechanical measurement, attenuated total reflectance–Fourier transform infrared spectroscopy, and scanning electron microscopy analysis, the lignin amine modified WPU did not show any evidence of degradation after 2 months of artificial accelerated aging, whereas the pure WPU was obviously degraded. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1736–1742, 2013