摘要
建立了溶剂分子透过聚合物层状共混物的扩散模型 ,给出了溶剂分子相对有效扩散系数D0 /D与分散相体积分数、不可透薄片形状参数α以及薄片接头缺口参数δ之间的关系式 .经采用不同值及α值共混物得到的实验数据证明 。
Membranes which contain impermeable flakes or lamellae can show permeabilities much lower than conventional membranes. The variation of membrane permeability with flake volume fraction ,flake aspect ratio α and slit aspect ratio δ is studied in this paper,and a new diffusion model in the barrier membranes is suggested:D 0D=1δ+α 2 21-.This model is verified by the diffusion experiments of varying flake volume fraction and varying aspect ratio α . It can be concluded that the diffusion is greatly retarded by two factors: the tight slits between the flakes,and the tortuous wiggles to get around the flakes. The1 δ is the effect of the slits which decreases the cross-sectional area through which diffusion can occur,while the α 2 21- is the effect of the wiggles which both decrease the cross-sectional area and increase the length for diffusion through the barrier membrane.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2002年第11期1160-1163,共4页
CIESC Journal
基金
中国石油化工 (集团 )公司资助项目 (No 4960 0 7)~~
