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采用以超临界CO2为物理发泡剂的固态间歇发泡技术制备了环氧树脂微孔材料,利用SEM和DSC研究了环氧树脂微孔材料的制备工艺,分析了发泡前后环氧树脂的力学性能和介电性能。结果表明:环氧树脂片材的预固化度为75%~85%时,气体浓度达到5.11%~5.43%,气体饱和时间为48h,泡孔排列紧密尺寸均匀。发泡温度的提高和发泡时间的延长会使环氧树脂微孔材料的平均泡孔直径逐渐增大,泡孔密度逐渐降低。当环氧树脂片材预固化度为75%、发泡温度为120℃、发泡时间为10s时,环氧树脂微孔材料的平均泡孔直径为10.6μm,泡孔密度为1.03×109个/cm3,泡孔呈均匀致密的球形或多边形结构。与未发泡材料相比,环氧树脂微孔材料的断裂伸长率和冲击强度分别提高了43%和39%,介电常数降低了42%,介电损耗降低了50%。
Epoxy resin microporous materials were prepared by using solid state intermittent foaming technology with supercritical CO2 as physical blowing agent. The preparation process of epoxy microporous materials was studied by SEM and DSC. The effects of epoxy resin before and after foaming Mechanical and dielectric properties. The results showed that when the pre-curing degree of epoxy resin sheet was 75% ~ 85%, the gas concentration reached 5.11% ~ 5.43%, the gas saturation time was 48h, and the cell size was uniform. The increase of foaming temperature and the prolongation of foaming time will make the average cell diameter of epoxy microporous material increase gradually and the cell density will decrease gradually. When the pre-curing degree of the epoxy resin sheet is 75%, the foaming temperature is 120 ° C and the foaming time is 10s, the average cell diameter of the epoxy microporous material is 10.6 μm and the cell density is 1.03 × 109 / cm3, the cell is uniform and compact spherical or polygonal structure. Compared with the unfoamed material, the elongation at break and the impact strength of the epoxy microporous material increased by 43% and 39% respectively, the dielectric constant decreased by 42% and the dielectric loss by 50%.