Lin Jianyong, Yang Zexun, Hu Xiaoxia, Hong Gonghua, Zhang Shuangbao, Song Wei
Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
Polymers (Basel). 2018 Apr 4;10(4):403. doi: 10.3390/polym10040403.
In this study, a synergistic treatment including dopamine (DA) modification and alkali pretreatment on bamboo fiber (BF) was used as reinforcement in a polylactic acid (PLA) matrix to improve the mechanical and thermal properties of BF/PLA composites. The effects of the sodium hydroxide loading rate on the performance of mussel-inspired dopamine-modified bamboo fiber and the BF/PLA composites were evaluated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), mechanical testing (examining flexural, tensile, and impact properties), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). Analysis of the composites suggested that the optimal condition was treatment with a 4 wt % solution of NaOH and a 1 wt % concentration of dopamine. Compared with the untreated bamboo fiber/polylactic acid composites, the synergistic treatment improved the thermal properties and mechanical properties; flexural, tensile, and impact strengths increased by 16.1%, 34.4%, and 3.7%, respectively. It was further verified that appropriate alkali treatment was a promising approach in promoting the effect of dopamine-modified coating while maintaining the crystal structure of the cellulose.
在本研究中，一种包括多巴胺（DA）改性和碱预处理的协同处理方法被用于对竹纤维（BF）进行处理，以作为聚乳酸（PLA）基体中的增强材料，从而改善BF/PLA复合材料的力学性能和热性能。使用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、力学测试（检测弯曲、拉伸和冲击性能）、差示扫描量热法（DSC）、热重分析（TGA）和扫描电子显微镜（SEM），评估了氢氧化钠负载率对受贻贝启发的多巴胺改性竹纤维以及BF/PLA复合材料性能的影响。对复合材料的分析表明，最佳条件是用4 wt%的氢氧化钠溶液和1 wt%的多巴胺浓度进行处理。与未处理的竹纤维/聚乳酸复合材料相比，协同处理改善了热性能和力学性能；弯曲强度、拉伸强度和冲击强度分别提高了16.1%、34.4%和3.7%。进一步证实，适当的碱处理是一种在促进多巴胺改性涂层效果的同时保持纤维素晶体结构的有前景的方法。
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