论文部分内容阅读
以超临界二氧化碳(Sc-CO2)为物理发泡剂,在高压釜中采用两种温度设定方式和降压对聚苯乙烯(PS)进行发泡,测试、分析发泡样品的泡孔结构、泡体密度和断面润湿性能.结果表明,仅通过降压只获得单峰的泡孔结构,而升温与降压协同作用可获得双峰的泡孔结构,大、小泡孔分别在升温和降压阶段成核形成;在发泡温度100℃、饱和温度30~70℃下制备的发泡样品中,大、小泡孔的平均直径分别为50~216和10~15μm.大泡孔的直径较大和密度较高都有利于降低样品的泡体密度,最低达0.15 g/cm3.单峰泡孔结构能在一定程度上提高样品断面的疏水性,使静态接触角(CA)从PS的本征值(87.1°)增大至138.8°;双峰泡孔结构可赋予样品断面更高的CA(155.1°),呈现超疏水特性.
Foam was made by using two kinds of temperature setting methods and depressurization in polystyrene foam (PS-SC) with supercritical carbon dioxide (Sc-CO2) as a physical blowing agent. The cell structure of foamed samples was analyzed and analyzed. , Cell density and cross-section wettability.The results show that only a single-peaked cell structure can be obtained only by depressurization, while the double-peaked cell structure can be obtained by synergistic heating and depressurization. And depressurization stage. The average diameters of large and small vesicles in the foamed samples prepared at the foaming temperature of 100 ℃ and the saturation temperature of 30 ~ 70 ℃ are 50 ~ 216 and 10 ~ 15μm respectively. The larger diameter and higher density are conducive to reduce the foam density of the sample, the lowest up to 0.15 g / cm3.The unimodal cell structure can to some extent improve the hydrophobicity of the sample cross-section, the static contact angle (CA) from the PS (87.1 °) increased to 138.8 °. The bimodal cell structure conferred a higher CA (155.1 °) on the cross-section of the sample and exhibited superhydrophobic properties.