Ultrasonically Acid-assisted Milled Cellulose Nanocrystal Incorporated with TiO2 for UV Shielding Application
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Abstract
Cellulose nanocrystal (CNC) was prepared by a unique acid-assisted ultrasonically ballmilling process. XRD results affirmed that CNC product after milling process was in cellulose Iᵦ structure, while TEM image distinctly showed cellulose nanocrystal features. CNC/TiO2 composite was prepared by conventional mixing method using distilled water as a medium. Surface interactions between CNC and TiO2 in the composite were investigated by XPS and FTIR spectra. CNC/TiO2 composite was blended in polylactic acid (PLA) matrix by casting in thin layered film using a twin-screw extruder cast machine. Moreover, UV absorption performance of CNC/TiO 2 composite in PLA film was evaluated by UV-Vis spectroscopy and compared with bare PLA, TiO2 particles and CNC in PLA film. UV absorption properties of CNC/TiO2/PLA composite film can significantly enhanced by the incorporation of CNC and TiO2 in PLA matrix.
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