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气体分离膜是近年发展起来的应用前途广阔的一个领域。近年来由于非对称膜技术的开发,美国和日本已开始用硅橡胶涂复在多孔聚砜上制成PDMS-PS复合膜。PDMS是透气量最高而稳定的膜材料,但氧氮分离系数仅为2。 乙基纤维素(EC)具有机械强度高、抗热、耐寒和稳定性好等优点,是一种具有潜力的优秀膜材料。其中取代基的位置和含量对膜的性能有较大的影响。日、美等国科学家利用EC对氧氮的良好分离系数制成了中孔纤维材料富氧器、EC涂复在聚二甲基硅氧
Gas separation membrane is developed in recent years, a promising field of application. In recent years due to the development of asymmetric membrane technology, the United States and Japan have begun to use silicone rubber coating made of porous polysulfone PDMS-PS composite membrane. PDMS is the highest air permeability and stability of the membrane material, but oxygen and nitrogen separation factor of only 2. Ethyl cellulose (EC) has the advantages of high mechanical strength, heat resistance, cold resistance and good stability, and is an excellent membrane material with potential. The position and content of the substituents have a greater impact on the performance of the membrane. Japan, the United States and other countries using EC EC good oxygen and nitrogen separation coefficient made of mesoporous fiber material oxygen enrichment, EC coated in polydimethylsiloxane