Su Xiuru, Xu Chuan, Liao Jianming, Liu Zhan, Liu Daoheng, Ye Mengting, Li Long, Xu Zhuhan, Guo Shasha, Li Jun
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510641, China.
Guangzhou Customs Technology Center, Guangzhou 510000, China.
Int J Biol Macromol. 2025 May;307(Pt 2):141922. doi: 10.1016/j.ijbiomac.2025.141922. Epub 2025 Mar 10.
Foam materials hold great promise in construction and packaging applications. However, the non-biodegradability and poor thermal stability of petroleum-based foams present serious environmental and safety concerns. It is crucial to develop sustainable, eco-friendly foam fabrication methods that balance environmental responsibility with high performance. In this study, a novel high-strength, heat-resistant, and water-stable composite foam (FPLs) made from Lignin-based waterborne polyurethanes (LWPUs) and Cellulose fibers, derived from full-component utilization of lychee pruning waste, is introduced. A eco-friendly and simple method utilizing LWPUs crosslinking to fabricate composite foams has been developed, bypassing the need for special drying and ensuring scalability. The FPLs exhibits a high compressive modulus of 455.8 kPa and a yield strength of 191.2 kPa due to the interaction between the LWPUs adhesive and the cellulose fibers. In addition, it demonstrates natural water resistance (maximum contact angle of 122°), exceptional photothermal conversion performance (reaching a peak temperature of 199.7 °C under infrared laser irradiation), superior thermal stability (no deformation up to 250 °C), and insulation performance (thermal conductivity of 0.038 W/mK), while maintaining excellent degradability and recyclability. These materials hold promise as sustainable alternatives to conventional plastic-based foams, providing a viable solution to mitigate the pervasive issue of "white pollution."
泡沫材料在建筑和包装应用中具有巨大潜力。然而，石油基泡沫的不可生物降解性和较差的热稳定性带来了严重的环境和安全问题。开发可持续、环保的泡沫制造方法至关重要，这种方法要在环境责任和高性能之间取得平衡。在本研究中，介绍了一种由荔枝修剪废弃物全组分利用衍生的木质素基水性聚氨酯（LWPUs）和纤维素纤维制成的新型高强度、耐热且耐水的复合泡沫（FPLs）。已开发出一种利用LWPUs交联来制造复合泡沫的环保且简单的方法，无需特殊干燥并确保可扩展性。由于LWPUs粘合剂与纤维素纤维之间的相互作用，FPLs表现出455.8 kPa的高压缩模量和191.2 kPa的屈服强度。此外，它表现出天然耐水性（最大接触角为122°）、出色的光热转换性能（在红外激光照射下达到199.7°C的峰值温度）、优异的热稳定性（在250°C以下无变形）和隔热性能（热导率为0.038 W/mK），同时保持出色的可降解性和可回收性。这些材料有望成为传统塑料基泡沫的可持续替代品，为缓解普遍存在的“白色污染”问题提供可行的解决方案。
