Preparation and Foaming Properties of PMMA Nano-cellular Foam
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摘要: 选用对于超临界CO2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CO2间歇式发泡法,探究饱和阶段、发泡阶段参数以及CO2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CO2吸附率,在0 ℃、15 MPa条件下饱和48 h,PMMA中的CO2吸附率达到最大值35.72%。将CO2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1.57×1015 个/cm3、泡孔平均尺寸为35.9 nm且分布均匀的PMMA纳米孔泡沫。
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关键词:
- 纳米孔泡沫 /
- 超临界CO2间歇式发泡 /
- 低温饱和
Abstract: PMMA with high adsorption capacity for supercritical carbon dioxide is selected as the matrix material and foamed by supercritical CO2 foaming technology. The influences of saturation and foaming stage parameters and CO2 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 CO2, and that the mass fraction of CO2 in PMMA increases from 21.59% to 35.72%.After the PMMA with CO2 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 1.57×1 015. -
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