在高温下稳定且柔韧的环保型基于杨树的透明复合材料。

Zou Weihua, Sun Delin, Wang Zhangheng, Li Ruoyao, Yu Wenxuan, Zhang Pingfang

Central South University of Forestry and Technology Shaoshan South Road 498 Changsha 410004 China

RSC Adv. 2019 Jul 11;9(37):21566-21571. doi: 10.1039/c9ra03550h. eCollection 2019 Jul 5.

Farmed poplar could meet the human demand for transparent wood-based composites to replace glass, avoiding the consumption of natural forest resources. We removed the lignin of poplar using a potassium hydroxide (KOH) and deionized water solution, the waste black liquor could be converted into compound potassium fertilizer after being neutralized by phosphoric acid. Polyurethane (PU) was then added to the lignin-stripped poplar and hardened, the transparent poplar-based composite (TPC) has stable transparency at high temperatures, and flexibility - it elongates (about 15%) before breaking. These properties could provide more uses in hot environments requiring a flexible shape. The TPC PU provides transmittance of 85%, haze of 83%, and anisotropic light diffraction.

人工种植的杨树能够满足人类对透明木质复合材料的需求，以替代玻璃，避免消耗天然森林资源。我们使用氢氧化钾（KOH）和去离子水溶液去除杨树中的木质素，废弃的黑液经磷酸中和后可转化为复合钾肥。然后将聚氨酯（PU）添加到去除木质素的杨树中并使其硬化，这种透明的杨树基复合材料（TPC）在高温下具有稳定的透明度和柔韧性——在断裂前可伸长（约15%）。这些特性使其在需要灵活形状的高温环境中有更多用途。TPC-PU的透光率为85%，雾度为83%，且具有各向异性光衍射。