CO2分离

Abstract(#br)A series of poly(ethylene glycol)- block -poly(pentafluoropropyl acrylate) diblock copolymers were synthesized by Reversible Addition Fragmentation Chain Transfer (RAFT) polymerization. These block copolymers were blended up to 60\u003cce:hsp sp=\"0.25\"/\u003ewt% with commercially available PEBAX ® 2533. The resulting polymer mixtures were successfully spin coated onto cross-linked polydimethylsiloxane (PDMS) gutter layers which in turn had been deposited onto a porous polyacrylonitrile (PAN) support, to form a thin film composite membrane.

Abstract(#br)Amidoxime-functionalized polydimethylsiloxane (AO-PDMSPNB) membranes with various amidoxime compositions were synthesized via ring-opening metathesis polymerization followed by post-polymerization modification. Compared to other previously reported PDMS-based membranes, the amidoxime-functionalized membranes show enhanced CO 2 permeability and CO 2 /N 2 selectivity.

Abstract(#br)This study aimed to improve surface polarity of polydimethylsiloxane (PDMS) membranes and provide surface active sites which were easy to react with other chemicals. 3-Aminopropyltriethoxysilane (APTES) containing an amino group was introduced into a PDMS membrane by crosslinking to prepare polyacrylonitrile hollow fiber-supported PDMS membranes with an amino-functionalized surface. Fourier transform infrared and X-ray photoelectron spectroscopic analyses proved the existence of APTES and its amino group in the PDMS membrane.

将冠醚二胺( trans-diamino-DB18C6 )和PDMS-二胺通过缩聚反应与4，4′- (六氟异丙基)二苯酐( 6FDA )共聚，合成了一系列CO2选择性聚酰亚胺( CE- PDMS-PI-x )。通过核磁共振( NMR )、红外光谱( ATR- FTIR )、热重分析( TGA )、差示扫描量热( DSC )、X射线衍射( XRD )、凝胶渗透色谱( GPC )等表征了共聚物及相应膜的结构特征，进一步分析了PDMS负载对CE- PDMS-PI-x共聚物的影响，发现了很好的结构-性能关系。一个分布均匀的软PDMS单元对膜的形貌起关键作用，其中在较低的PDMS含量( 5wt % )下观察到改善了CO2 -分离性能。相比之下，细晶相分离在一定PDMS负载量水平下对分离行为产生不利影响，发现PDMS提供了柔性的气体扩散路径，对于PDMS含量为20 %或以上的共聚物，只影响渗透率而不改变选择性气体分离性能。