In this work, lignin-decorated
ZnO composite was prepared via an
in situ synthesis method using industrial alkali lignin (AL). First,
the AL was modified by quaternization to prepare quaternized alkali
lignin (QAL). The microstructure and optical properties of the QAL/ZnO
composite were characterized by scanning electron microscopy (SEM),
transmission electron microscopy (TEM), X-ray diffraction (XRD), and
UV–vis and photoluminescence (PL) spectroscopy. These results
showed that the prepared QAL/ZnO composite possessed a flowerlike
structure and showed excellent synergistic UV-absorbent properties.
Interestingly, the anti-UV performance and mechanical properties of
polyurethane (PU) were significantly improved when it was blended
with the resulting QAL/ZnO. In comparison with pure PU film, the UV
transmittance of the PU film was rapidly reduced. Furthermore, the
tensile strength and elongation at break of PU film blended with QAL/ZnO
were significantly improved, which was due to good compatibility between
QAL/ZnO and PU matrix. Results of this work provide a significant
and practical approach for the high value-added utilization of lignin
as a functional material.
Three purified sodium lignosulfonates (SLs) with different molecular weights were prepared by ultrafiltration. The structural characteristics of SL and their effects on the properties of dye were investigated. When the molecular weight is increased, the chroma, purity, and the content of guaiacyl of SL increases, whereas the phenolic hydroxyl, carboxyl, and sulfonic groups in SL decrease, the dispersibility, heat stability properties, and dyeing rate of SL on dye improve, and the fiber staining of SL weakens at high concentration. The fraction of SL with the cutoff molecular weight above 2.5 kDa has the weakest reduction effect on dyestuffs.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.