低密度聚亚胺酮泡沫的制备

确定了以1,4-二氧六环为溶剂体系,经热致相分离和冷冻干燥技术制备了低密度聚亚胺酮泡沫,分析了其质量浓度对泡沫密度的影响,结果显示:泡沫实验密度与聚合物浓度有较好的线性关系,可实现对泡沫密度的有效控制。差示扫描量热法、热重法等热性能测试结果表明:聚亚胺酮泡沫材料的热分解行为与本体材料一致,但玻璃化温度较本体材料玻璃化温度高。泡沫孔结构测试结果表明:随着密度的增加,平均孔径有降低的趋势,孔径分布趋于单一化。对其力学性能进行分析可知:所制备的泡沫硬而强,具有较高的模量和抗压强度,断裂压缩随密度增加而增加。随着泡沫密度的增加,其破坏形变随之增加。

Preparation of low density polyimino kefones foams

Based on the polyimino ketone(PIKs), low density microporous foams were successfully prepared with the dioxane solvent by the general freezing-dry technology. In order to analyze the relationship between polymer concentration and foam density, a series of PIKs solution with different concentrations were confected. The results show that the polymer concentration has a good linear relationship with the actual density of PIKs foams and there is a fixed difference between the actual density and theoretic density, which will effectually control the density of foams. The pore structures of foams were also analyzed. The results show that with the increase of densities, the average pore size and BET surface area decrease. The general properties of PIKs foams are characterized by means of DSC, TG,