首页|Microstructure and viscoelastic behavior of waterborne polyurethane/cellulose nanofiber nanocomposite
Microstructure and viscoelastic behavior of waterborne polyurethane/cellulose nanofiber nanocomposite
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NSTL
Elsevier
? 2022 The Korean Society of Industrial and Engineering ChemistryCellulose nanofiber (CNF) has been widely used to reinforce the mechanical properties of waterborne polyurethane (WPU). There are, however, few works that focus on structure, rheological behavior, and creep resistance of WPU/CNF composites. To fill this research gap, in this work, the m-CNF was obtained by γ-aminopropyltriethoxysilane modification to improve the interfacial strength of CNF and WPU, and then it was introduced into the polyurethane matrix. Structure characterization of WPU/m-CNF nanocomposites is performed using Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The obtained results show that with the increase of m-CNF, the hydrogen bonding index (HBI) increased, which meant a significant improvement in the mechanical properties. The tensile strength improved by 480%. Moreover, with the increase of m-CNF content, the viscosity, storage modulus, and loss modulus of the dispersions increased and showed more obvious shear-thinning behavior. In addition, m-CNF improved the thermal stability and creep resistance of WPU. The creep strain of WPU decreased from 3% to 0.2%. This work offers a simply feasible way to prepare environmental friendly green nanocomposites.
Zhao H.、Li K.-C.、Jiang Y.、Cheng B.-X.、Huang C.-X.、Li Q.、Li H.-N.、Wu W.
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Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control School of Light Industry and Food Engineering Guangxi University
Guangxi Key Laboratory of Chemistry and Engineering of Forest Products Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products Guangxi University for Nationalities
State Key Laboratory of Biocatalysis and Enzyme Engineering School of Life Sciences Key Laboratory for the Green Preparation and Application of Functional Materials Hubei University
Shenzhen Institute of Advanced Electronic Materials Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences
NSTL
Elsevier
