Synthesis of Polyimides Containing Fluorine and Their Pervaporation Performances to Aromatic/Aliphatic Hydrocarbon Mixtures
Synthesis of Polyimides Containing Fluorine and Their Pervaporation Performances to Aromatic/Aliphatic Hydrocarbon Mixtures
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DOI：
10.1080/10601320701786984
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发表时间：
2008-01
期刊：
影响因子：
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通讯作者：
H. Ye;Ji-ding Li;Yangzheng Lin;Jian Chen;Cuixian Chen
中科院分区：
文献类型：
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作者：
H. Ye;Ji-ding Li;Yangzheng Lin;Jian Chen;Cuixian Chen
以2，2-二(3，4-二羧基苯基)六氟丙烷二酐(6FDA)和2，2-二[4-(4-氨基苯氧基)苯基]六氟丙烷(BDAF)和2，2-二[4-(4-氨基苯氧基)苯基]丙烷(BAPP)为原料，采用溶液缩合和化学亚胺化的方法合成了两种含氟聚酰亚胺。用红外光谱、核磁共振和X射线衍射仪对6FDA-BDAF和6FDA-BAPP的结构进行了表征。DSC表征的玻璃化转变温度在235~251℃之间，TGA测定的起始分解温度在540℃以上。所制得的聚酰亚胺膜用于芳烃/脂肪族混合物的渗透汽化分离。6FDA-BDAF膜具有比6FDA-BAPP更好的分离性能，在80℃下对甲苯/正庚烷(20/80wt.%)的通量为0.66 kg·µm/m2·h，分离系数为6.49。
Two kinds of polyimides containing fluorine were synthesized based on dianhydride of 2,2‐bis(3,4‐dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and diamines including 2,2‐bis[4‐(4‐aminophenoxy)phenyl] hexafluoropropane (BDAF) and 2,2‐bis[4‐(4‐aminophenoxy)phenyl]propane (BAPP) using solution condensation and following chemical imidization. The structures of 6FDA‐BDAF and 6FDA‐BAPP were characterized by FT‐IR, NMR, and XRD. Their glass transition temperatures characterized by DSC were in the range of 235–251°C, and the initial decomposition temperatures determined by TGA were over 540°C. The membranes of polyimide thus obtained were employed in pervaporation separation of aromatic/aliphatic mixtures. 6FDA‐BDAF membranes obtained better separation performances than 6FDA‐BAPP and had a flux of 0.66 kg · µm/m2 · h and separation factor of 6.49 for toluene/n‐heptane (20/80 wt.%) at 80°C. The effects of the fluorine group on polyimides properties and separation performances were investigated.