PMMA纳米孔泡沫的制备及发泡性能研究

Preparation and Foaming Properties of PMMA Nano-cellular Foam

选用对于超临界CO_(2)具有高吸附能力的聚甲基丙烯酸酯(PMMA)作为基体材料,通过超临界CO_(2)间歇式发泡法,探究饱和阶段、发泡阶段参数以及CO_(2)吸附率对PMMA泡沫结构参数的影响。结果表明,在一定范围内,当其他条件相同时,降低温度或增大压力均能增加CO_(2)吸附率,在0℃、15 MPa条件下饱和48 h,PMMA中的CO_(2)吸附率达到最大值35.72%。将CO_(2)吸附率为35.72%的PMMA在40℃油浴中发泡30 s,可以获得泡孔密度为1.57×10^(15)个/cm^(3)、泡孔平均尺寸为35.9 nm且分布均匀的PMMA纳米孔泡沫。

PMMA with high adsorption capacity for supercritical carbon dioxide is selected as the matrix material and foamed by supercritical CO_(2)foaming technology.The influences of saturation and foaming stage parameters and CO_(2)adsorption capacity on the structure parameters of the PMMA foam are studied.The results reveal both the low-temperature and high-pressure can increase the adsorption capacity of CO_(2),and that the mass fraction of CO_(2)in PMMA increases from 21.59%to 35.72%.After the PMMA with CO_(2)of 35.72%is foamed at 40℃for 30 s,we can obtain the PMMA nano-cellular foam with the uniform cell size of 35.9 nm and cell density of 1.57×10^(15).