CAJ | 학술논문

为了改善酚醛泡沫的性能，选用短切芳纶纤维作为增强材料，考察了不同短切芳纶纤维用量对酚醛泡沫压缩强度、压缩弹性模量、泡孔结构以及热稳定性能的影响。结果表明，短切芳纶纤维可以有效地增强酚醛泡沫的压缩性能。随着短切芳纶纤维用量的增加，酚醛泡沫的压缩强度和压缩弹性模量呈现先增加后减小的变化趋势。当短切芳纶纤维用量为4份时，酚醛泡沫的压缩强度比未添加短切芳纶纤维的酚醛泡沫提高约38%。短切芳纶纤维用量影响酚醛泡沫的泡体直径及其分布。当短切芳纶纤维用量为8份时，短切芳纶纤维在酚醛泡沫中的分布很不均匀，酚醛泡沫脆断截面上泡体破损现象较为严重，集束分布的短切芳纶纤维对酚醛泡沫的结构和力学性能带来不利影响。添加短切芳纶纤维可以明显提高酚醛泡沫在高温条件下(＞400℃)的热稳定性。
위료개선분철포말적성능，선용단절방륜섬유작위증강재료，고찰료불동단절방륜섬유용량대분철포말압축강도、압축탄성모량、포공결구이급열은정성능적영향。결과표명，단절방륜섬유가이유효지증강분철포말적압축성능。수착단절방륜섬유용량적증가，분철포말적압축강도화압축탄성모량정현선증가후감소적변화추세。당단절방륜섬유용량위4빈시，분철포말적압축강도비미첨가단절방륜섬유적분철포말제고약38%。단절방륜섬유용량영향분철포말적포체직경급기분포。당단절방륜섬유용량위8빈시，단절방륜섬유재분철포말중적분포흔불균균，분철포말취단절면상포체파손현상교위엄중，집속분포적단절방륜섬유대분철포말적결구화역학성능대래불리영향。첨가단절방륜섬유가이명현제고분철포말재고온조건하(＞400℃)적열은정성。
In order to improve the performance of phenolic foams,chopped aramid fibers were chosen as padding material to prepare chopped aramid fiber reinforced phenolic foams. The influences of fiber loading on the compression performance, microstructure and thermal stability of the phenolic foams were investigated. The compression behaviors of the phenolic foams can be effectively improved by adding chopped aramid fibers. The compression strength and compression elastic modulus of the phenolic foams increased with the fiber loading at first and then dropped afterwards. When the fiber content is 4 phr,the compression strength of the phenolic foams can be enhanced by 38% with respect to the control one. The foam cell size and its distribution varied with different fiber loading. When the fiber content is 8 phr,it can be seen in the SEM images that fibers are distributed quite inhomogeneously and the cell collapse phenomena become worse,which show that the randomly distributed clustered fibers have a side effect on the phenolic foams structure and properties. In addition,adding chopped aramid fibers can improve the high temperature (>400℃) thermal stability of the phenolic foams obviously.