中空玻璃微珠增强酚醛泡沫的压缩性能及热稳定性

为了改善酚醛泡沫（PF）的力学性能，通过模压成型制备了中空玻璃微珠（HGB）增强的PF复合材料，采用力学性能测试、热重分析和燃烧试验研究了HGB用量对复合材料压缩性能和热性能的影响，并对其增强机制进行了分析。结果表明：当HGB质量分数为树脂的10%时，增强PF的压缩比强度和压缩比模量达到最大值；经过硅烷偶联剂表面处理的HGB增强PF的压缩比强度和压缩比模量提高幅度较大。热重分析和垂直燃烧试验表明：HGB的加入降低了PF的热降解速率，使其热稳定性有所提高，阻燃性能略有下降。SEM、FTIR和EDS分析表明：HGB增强PF的破坏方式为泡孔受挤压破碎，并最终导致HGB脱粘或刚性破碎。HGB增强PF的泡孔密度增加、泡孔直径变小，HGB表面与树脂基体间界面粘结状况良好，在树脂基体中均匀分散。

Compressive property and thermal stability of hollow glass bead reinforced phenolic foams

In order to improve the mechanical properties of phenolic foam(PF), phenolic foam composites reinforced by hollow glass beads (HGB) were prepared by compression molding. The compressive property and thermal stability of the composites were evaluated by mechanics performance test, TG analysis and vertical burning method, and the strengthen mechanism were also analyzed. The results show that when the mass ratio of HGB to PF reaches 10%, both of the compressive strength and compressive modulus of PF/HGB reach the maximum value. Pretreated with silicane coupling agent, the compressive strength and compressive modulus of hollow glass beads reinforced phenolic foams improve substantially. TG analysis and vertical burning method show that HGB as filler reduces thermal degradation rate of foam, leading to slightly higher thermal stability but slightly lower flame resistance. Analyses by SEM, FTIR and EDS reveal that the breakage behavior of PF/HGB is breakage of the cells, which leads to the HGB debond or rigid fracture. The froth density of PF/HGB increases, frothy diameter decreases, the interfacial adhesion between the surface of hollow glass bead and PF matrix is good, and hollow glass beads disperse homogeneously in PF matrix.