Sorption and Diffusion of Supercritical Carbon Dioxide into Nitrocellulose with or without Cosolvents

被引:7
|
作者
Sun, Meiling [1 ]
Ying, Sanjiu [1 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing, Jiangsu, Peoples R China
关键词
Cosolvent; Diffusion; Ethanol; Ethyl acetate; Nitrocellulose; Sorption; POLYMER; CO2; POLYCARBONATE; POLYPROPYLENE; POLYSULFONE; SOLUBILITY;
D O I
10.1080/03602559.2012.702253
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Sorption and diffusion of supercritical carbon dioxide (SC-CO2), SC-CO2 +ethanol, or SC-CO2 + ethyl acetate into nitrocellulose were examined at 40 degrees Cunder 25MPa for the 0.5-6 h soaking duration using a gravimetric method. A small addition of cosolvent into SC-CO2 leads to a dramatic increase in solubility, desorption diffusivity and sorption diffusivity of CO2 into nitrocellulose. The addition of ethyl acetate or ethanol into SC-CO2 boosts the equilibrium solubility of CO2 in nitrocellulose from 15.74 wt% to 23.52 wt% and from 15.74 wt% to 22.72 wt%, respectively. The desorption diffusivities are found to be higher than the sorption diffusivities due to the plasticizing effect of CO2.
引用
收藏
页码:1346 / 1350
页数:5
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