Research progress on polymeric membranes containing fluorenyl,imide and naphthyl groups for gas separation
The inter-polymer chain spacing and polymer chain stiffness are the determining factors for gas permeation properties,the introduction of rigid groups(fluorenyl,imide and naphthyl)into the polymer chain can effectively improve gas permselectivity due to the presence of large volume and rigid twisted groups in polymers can inhibit interchain stacking of relatively rigid chains(i.e.,increase free volume fraction)and reduce rotational mobility around flexible links(i.e.,increase stiffness).In this paper,the recent five years studies on membranes based on polymer containing fluorenyl,imide and naphthyl group materials in the field of gas separation were reviewed.These researches were classified by the structure of polymer materials that make up the membranes and introduced in terms of synthesis,gas selectivity and the main factor affecting the selectivity.Finally,based on the characteristics of rigid polymers,the application of rigid polymer materials should be expanded in terms of the modification of existing materials with high gas permeability and low selectivity,the modification of bio-based materials and the preparation of composite membranes,providing a reference for the preparation of gas separation membranes with high performance in the future.
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