State Key Laboratory of Efficient Production of Forest Resources & MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China.
State Key Laboratory of Efficient Production of Forest Resources & MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China.
Int J Biol Macromol. 2024 Oct;277(Pt 3):134470. doi: 10.1016/j.ijbiomac.2024.134470. Epub 2024 Aug 3.
Transparent bamboo proved to be a promising substitute for glass due to its high light transmittance and excellent mechanical properties. Nevertheless, it was susceptible to outdoor weathering, which negatively affected its physical and mechanical properties. In this study, two decolorisation methods, namely the delignification method and the lignin modification method, were used to produce transparent bamboos with epoxy resin, referred to as DL-TB and LM-TB, respectively. The changes in surface color, optical and mechanical properties, wettability, thermal stability, and thermal insulation properties of transparent bamboo during accelerated UV weathering were evaluated. Additionally, the deterioration mechanism of DL-TB and LM-TB was investigated. The findings revealed that DL-TB demonstrated better transparency and mechanical properties than LM-TB, although it exhibited lower thermal insulation properties. Furthermore, DL-TB demonstrated enhanced color stability and higher hydrophobicity on weathered surfaces than LM-TB. Unexpectedly, the tensile properties of both two transparent bamboos significantly improved after weathering, especially for LM-TB, which was due to the EP post-curing and the formation of more hydrogen bonds between lignin and EP. These observations revealed that lignin played a key role in the photodegradation process of transparent bamboo, but further attempts should be made in future studies to improve its color stability.
由于透光率高和机械性能优异，透明竹被证明是一种很有前途的玻璃替代品。然而，它容易受到户外风化的影响，这会对其物理和机械性能产生负面影响。在这项研究中，使用了两种脱色方法，即脱木质素法和木质素改性法，用环氧树脂分别制备透明竹，称为 DL-TB 和 LM-TB。评估了透明竹在加速 UV 风化过程中表面颜色、光学和机械性能、润湿性、热稳定性和隔热性能的变化，并研究了 DL-TB 和 LM-TB 的劣化机制。研究结果表明，DL-TB 比 LM-TB 具有更好的透明度和机械性能，但隔热性能较低。此外，DL-TB 表现出比 LM-TB 更好的风化表面颜色稳定性和更高的疏水性。出乎意料的是，两种透明竹的拉伸性能在风化后都显著提高，特别是对于 LM-TB，这是由于 EP 的后固化和木质素与 EP 之间形成了更多的氢键。这些观察结果表明，木质素在透明竹的光降解过程中起着关键作用，但未来的研究应进一步尝试提高其颜色稳定性。
