Characterization of Ethyl Acetate and Trichloromethane Extracts from <i>Phoebe</i> <i>zhennan</i> Wood Residues and Application on the Preparation of UV Shielding Films

• Main Authors: Fangya Pan, Lin Chen, Lu He, Yongze Jiang, Jinqiu Qi, Hui Xiao, Yuzhu Chen, Xingyan Huang, Hongling Hu, Lihua Tu, Tiantian Lin, Gang Chen, Jianfeng Hao, Yinlong Xiao, Jiulong Xie
• Format: Article
• Language: English
• Published: MDPI AG 2020-03-01
• Series: Molecules
• Subjects: wood extract; polylactic acid; ethyl acetate; trichloromethane; uv shielding
• Online Access: https://www.mdpi.com/1420-3049/25/5/1145

In this work, ethyl acetate (EA) and trichloromethane (TR) extracts were extracted from <i>Phoebe</i> <i>zhennan</i> wood residues and the extracts were then applied to the preparation of UV shielding films (UV-SF). The results revealed that substances including olefins, phenols and alcohols were found in both EA and TR extracts, accounting for about 45% of all the detected substances. The two extracts had similar thermal stability and both had strong UV shielding ability. When the relative percentage of the extract is 1 wt% in solution, the extract solution almost blocked 100% of the UV-B (280&#8722;315 nm), and UV-A (315&#8722;400 nm). Two kinds of UV-SF were successfully prepared by adding the two extracts into polylactic acid (PLA) matrix. The UV-SF with the addition of 24 wt% of the extractive blocked 100% of the UV-B (280&#8722;315 nm) and more than 80% of the UV-A (315&#8722;400 nm). Moreover, the UV shielding performance of the UV-SF was still stable even after strong UV irradiation. Though the addition of extracts could somewhat decrease the thermal stability of the film, its effect on the end-use of the film was ignorable. EA extracts had less effect on the tensile properties of the films than TR extracts as the content of the extract reached 18%. The results of this study could provide fundamental information on the potential utilization of the extracts from <i>Phoebe zhennan</i> wood residues on the preparation of biobased UV shielding materials.