Polycaprolactone (PCL)/bamboo fiber (BF) composites were prepared through a compression molding method and their thermal aging properties were studied.The effects of thermal aging time and temperature and the content of BF on the thermal aging properties of the composites were evaluated by mechanical tests,Fourier-transform infrared spectroscopic analysis and rheological analysis.The results indicated that the decrement in mechanical properties of PCL/BF composites after aging decreased as the content of BF increased initially and increased afterwards.The mechanical properties also decreased with increasing thermal aging temperature and time.The occurrence of thermal oxidation may lead to the decomposition of macromolecular groups inside the composites as well as the hydrolysis of the hydrophilic groups in PCL.In addition,the storage modulus and loss modulus of the composites tended to increase with an increase of thermal aging temperature and time.%以聚已内酯(PCL)和竹纤维(BF)为原料,通过模压成型工艺制备了PCL/BF复合材料并研究其热老化性能.通过力学性能分析、红外光谱分析、流变实验分析等来研究BF质量分数、热老化时间、热老化温度对PCL/BF复合材料热老化性能的影响.结果表明,随着BF质量分数的增加,PCL/BF复合材料老化后力学性能的降幅呈先减小后增大的趋势;储能模量及损耗模量上升程度随BF质量分数的增加呈现减小的趋势;随着热老化温度的升高及热老化时间的延长,复合材料的力学性能均下降;热氧化作用使得复合材料内部大分子基团大量分解,分子排列遭到破坏,PCL分子链上的基团与水发生反应,发生水解进而逐渐断裂;复合材料的储能模量、损耗模量随着热老化温度的升高及热老化时间的延长均呈现上升趋势.
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