Key Laboratory of Wood Material Science and Application (Beijing Forestry University), Ministry of Education, Beijing 100083, China; Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
Key Laboratory of Wood Material Science and Application (Beijing Forestry University), Ministry of Education, Beijing 100083, China; Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
Int J Biol Macromol. 2024 Oct;278(Pt 4):134954. doi: 10.1016/j.ijbiomac.2024.134954. Epub 2024 Aug 24.
Fiber-reinforced biocomposites were widely considered as the optimal sustainable alternative to traditional petroleum-based polymers due to their renewable, degradable, and environmentally friendly characteristics, along with economic benefits. However, the poor interfacial bonding between the matrix and natural fiber reinforcement remained a key issue limiting their mechanical and thermal properties. Focusing on cost-effective, convenient, and low-pollution chemical methods, this work proposed a strategy for in-situ synthesis of composite structures on bamboo fiber (BF) surfaces. Crude chitosan (CS) and reclaimed tannic acid (TA) were utilized as the raw materials, to construct stereo-netlike chitosan @ tannin structures (CS@TA) via a one-pot method facilitated by hydrogen bonding and complexation. The influence of reactant concentration and pH value on the process was further investigated and optimized. The CS@TA structure improved the interfacial bonding between the BF reinforcement and matrix poly(3-hydroxybutyrate) (PHB), and this non-amino-driven construction provided a potential reaction platform for functionalizing the interfacial layer. The modified biocomposite showed improvements in tensile and impact strengths (51.58 %, 41.18 %), also in tensile and flexural moduli (13.59 %, 26.88 %). Enhancements were also observed in thermal properties and heat capacity. This work presents a simple and promising approach to increase biocomposite interface bonding.
纤维增强生物复合材料由于其可再生、可降解和环境友好的特点以及经济利益，被广泛认为是传统石油基聚合物的最佳可持续替代品。然而，基体与天然纤维增强体之间较差的界面结合仍然是限制其力学和热性能的关键问题。本工作聚焦于经济高效、方便且低污染的化学方法，提出了一种在竹纤维（BF）表面原位合成复合材料结构的策略。利用粗壳聚糖（CS）和回收单宁酸（TA）作为原料，通过氢键和络合作用在一锅法中构建了立体网状的壳聚糖@单宁结构（CS@TA）。进一步研究和优化了反应物浓度和 pH 值对该过程的影响。CS@TA 结构改善了 BF 增强体与基体聚（3-羟基丁酸酯）（PHB）之间的界面结合，这种非氨基驱动的构建为功能化界面层提供了潜在的反应平台。改性生物复合材料的拉伸和冲击强度（51.58%，41.18%）以及拉伸和弯曲模量（13.59%，26.88%）均得到提高。热性能和热容也得到了提高。本工作提出了一种简单而有前途的方法来增加生物复合材料的界面结合。
