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将热塑性酚醛树脂通过熔融纺丝的方法制备了不同纤度的酚醛纤维原丝,并经后固化处理得到了交联的酚醛纤维,考察了酚醛纤维纤度与纤维拉伸强度和溶失率之间的关系,以及预氧化处理对酚醛纤维残碳率和耐热性的影响。研究结果表明,在一定范围内,经同样固化工艺处理的酚醛纤维的拉伸强度随纤度的减小而明显增大,而溶失率随纤度的减小而减小;经过预氧化处理过的酚醛纤维结构上引入更多交联点,当纤维在220℃处理30 min后,其强度和残碳率均达到最大值,并且纤维的耐热性能得到显著提高。
The phenolic fiber precursors with different titer were prepared by melt spinning the thermoplastic phenolic resin, and the crosslinked phenolic fibers were obtained by the post-curing treatment. The effects of the denier of the phenolic fibers, the tensile strength and the dissolution rate of the fibers Relationship, as well as the impact of pre-oxidation on residual carbon rate and heat resistance of phenolic fibers. The results show that within a certain range, the tensile strength of the phenolic fibers treated by the same curing process increases with the decrease of the fineness, but the dissolution rate decreases with the decrease of the fineness. After the pre-oxidation treatment More crosslinking points were introduced into the structure of phenolic fibers. When the fibers were treated at 220 ℃ for 30 min, their strength and residual carbon rate reached the maximum, and the heat resistance of the fibers was significantly improved.