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为了改善酚醛泡沫的韧性,采用聚酰胺对酚醛树脂进行了改性,并通过化学发泡法制备了不同含量聚酰胺改性酚醛泡沫,借助DSC曲线、凝胶化时间、弯曲强度S、EM照片等表征方法研究了聚酰胺对酚醛树脂及泡沫性能的影响。结果表明:聚酰胺与酚醛树脂发生了共固化反应;酚醛树脂的反应活性随着聚酰胺含量的增加逐渐降低;加入的聚酰胺有效的改善了酚醛泡沫的韧性;酚醛泡沫弯曲强度随着聚酰胺含量的增加呈现先增加后减小的趋势,当聚酰胺含量为10wt%时,弯曲强度达到最大,比未改性的提高了约81%;酚醛泡沫SEM照片显示少量聚酰胺可以改善泡沫的泡孔结构,当聚酰胺加入量为10wt%时,酚醛泡沫泡孔结构最好,泡孔大小均匀,平均直径约为400μm。
In order to improve the toughness of phenolic foam, phenolic resin was modified by polyamide and different content of polyamide modified phenolic foam was prepared by chemical foaming method. DSC curves, gelation time, flexural strength S, EM photo And other characterization methods to study the impact of polyamide on the properties of phenolic resin and foam. The results showed that the co-curing reaction between the polyamide and the phenolic resin occurred. The reaction activity of the phenolic resin gradually decreased with the increase of the polyamide content. The addition of polyamide effectively improved the toughness of the phenolic foam. When the polyamide content is 10wt%, the flexural strength reaches the maximum, which is about 81% higher than that of the unmodified ones. SEM pictures of phenolic foam show that a small amount of polyamide can improve the foaming foam Pore structure, when the amount of polyamide added is 10wt%, phenolic foam cell structure best, cell size uniform, the average diameter of about 400μm.