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在60℃、80℃相对湿度90%环境条件下对F-12纤维进行了湿热老化实验,研究了长时间老化时纤维吸湿规律。通过ATR-FTIR光谱分析了湿热老化后水对F-12纤维化学结构的影响以及水在纤维中可能存在的方式,探讨了吸湿机制;实验研究了纤维单丝拉伸强度的变化,并采用SEM观察了纤维表面及拉伸断口形貌。结果表明:F-12纤维长时间的吸湿属于2阶段吸湿,吸湿初期符合Fick第二定律,后期偏离,吸湿2500 h后仍没达到平衡;水分子对F-12纤维的化学结构没有造成明显的破坏;老化2500 h后F-12纤维表面变得粗糙,出现了一些沟槽,老化后期断口呈现出脆性与原纤化复合的特征;拉伸断裂强度并非持续减小,而是在起伏波动中减小。
The wet-heat aging experiments of F-12 fiber were carried out at 60 ℃ and 90 ℃ relative humidity of 80 ℃. The moisture absorption of fiber during aging was studied. ATR-FTIR spectroscopy was used to analyze the influence of water on the chemical structure of F-12 fiber after wet-heat aging and the way water could exist in the fiber. The hygroscopic mechanism was discussed. The tensile strength of fiber monofilament was studied experimentally. The fiber surface and tensile fracture morphology were observed. The results showed that the moisture absorption of F-12 fiber belongs to the second-stage moisture absorption, Fick’s second law accorded with Fick’s second law at the early stage of moisture absorption, and the latter period deviated. After moisture absorption for 2500 hours, the moisture balance did not reach equilibrium. The chemical structure of F- After aging for 2500 h, the surface of F-12 fiber became rough, some grooves appeared, and the fracture at the later aging showed the characteristics of brittle and fibrillated composite. The tensile strength at break did not decrease continuously but fluctuated Decrease