共聚物

Abstract(#br)An absolutely novel membrane of Poly (vinylchloride- co -vinylacetate) (PVCA) copolymer and polydimethylsiloxane (PDMS) with five different ratios were fabricated and used for further characterizations. Dense membranes of 50 μm were synthesized with ratios of PDMS and PVCA 99:1, 98:2, 97:3, 96:4 and 95:5 respectively. The separation performance is characterized by permeation studies of pure gases CO 2 , N 2 and CH 4 at two different temperatures i.e. 25 °C and 75 °C and pressure of 10 psi.

研究了紫外光照射对无规分段聚酰亚胺-硅氧烷( PIS )共聚物薄膜气体渗透性能的影响。以4，4\"- (六氟异丙基亚甲基)二苯甲酸酐( 6FDA )和3，3\"，4，4\"-苯甲酮四羧酸二酐( BTDA )为原料，以2，4 -二氨基二甲苯( DAM )和不同量的二胺封端聚二甲基硅氧烷( PDMS )低聚物( Mn   =  3000   g / mol )，以7∶3   M的比例进行酯酸亚胺化反应，合成了随机分段共聚物。这些共聚物的溶剂铸膜在365 nm的空气中被紫外光照射，引起交联和光氧化。在温度为35  ℃，上游压力为2 ~ 18   atm  的条件下，测定了H2、O2、N2、CH4和CO2的纯气体透过率.结果表明，PIS系列共聚物的气体透过率降低，紫外交联和光氧化使自由体积减小，所有气体对的选择性提高.