聚酰胺改性酚醛树脂及泡沫性能

Polyamide Modified Phenolic Resin and Phenolic Foam Properties

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。

The phenolic resin was modified by polyamide for improving the toughness of phenolic foama,nd was foamed by chemical method.The effect of polyamide on the properties of phenolic resin and foam was studied with the analytical methods including DSC,gel-time,bending strengtha,nd SEM.The results showed that the co-curing between polyamide and phenolic resin happenedt,he reactivity of phenolic resin decreased with the increasing of polyamidet,he polyamide improved the toughness of phenolic foam effectivelyt,he bending strength of phenolic foam presented the trend of up first and down second with the increasing of polyamidea,nd attained the most enhancing about 81% than the un-modified when the content is 10wt% t,he bubble structure of phenolic foam is improved from the SEM images by adding a little of polyamide,when adding 10wt% it is best and the bubble size is symmetrical in which the average diameter is about 400 μm.