【摘要】 为了对竹原纤维及其纺织制品在长期热氧环境下的寿命进行评估，采用80℃空气环境对竹原纤维进行加速热氧老化，设置老化时间为0、200、400、600、800 h来评估纺织用竹原纤维在长期热环境下的耐久性。通过色差分析仪、扫描电子显微镜、热重分析、红外光谱，X射线衍射、纤维拉伸等方式系统表征老化前后纤维的颜色、微观形貌、化学结构、吸水性、结晶性与热稳定性变化。结果表明：随老化时间延长，纤维表面逐渐出现孔洞和裂纹；晶型未发生转变但结晶度由67.7%降低至54.0%;初始分解温度由358℃略降至354℃,残炭量由6.9%增至15.2%;吸水率由222.3%下降至40.0%;力学性能呈非线性衰减：断裂强度由11.97 cN/tex降至6.80 cN/tex(降低43.19%),揭示了竹原纤维在长期热氧环境中结构-性能的劣化机制，为其在纺织应用领域提供了重要理论依据和数据支撑。更多还原

【Abstract】 In order to evaluate the life of bamboo fiber and its textile products in long-term thermal oxygen environment, the accelerated thermal oxygen aging of bamboo fiber was carried out at 80 ℃ air environment, and the aging time was set at 0, 200, 400, 600 and 800 h to evaluate the durability of bamboo fiber for textile in long-term thermal environment. The color, microstructure, chemical structure, water absorption, crystallinity and thermal stability of the fibers before and after aging were systematically characterized by color difference analyzer, scanning electron microscope, thermogravimetric analysis, infrared spectroscopy, X-ray diffraction and fiber tensile testing. The results indicate that with prolonged aging time, pores and cracks gradually appeared on the fiber surface. While the crystal form remained unchanged, the crystallinity index decreased from 67.7% to 54.0%. Thermal analysis revealed a slight decrease in the initial decomposition temperature(from 358 ℃ to 354 ℃) but a significant increase in char residue(from 6.9% to 15.2%). Notably, the water absorption capacity dropped drastically from 222.3% to 40.0%. Furthermore, mechanical properties exhibited non-linear degradation: the tensile strength decreased from 11.97 cN/tex to 6.80 cN/tex(a reduction of 43.19%). This paper reveals the degradation mechanism of structure-performance of bamboo fiber in long-term thermal oxygen environment, which provides important theoretical basis and data support for its application in textile field.更多还原