Membrane technology has drawn great attention owing to its advantages of being ecologically favorable, cost-efficient and easy to operate. In summary, the introduction of bulky substituents increased free volume and permeability whilst the maleimide moiety enhanced the water vapor affinity of the polymers. Copolymers (methyl-50 and t-butyl-50) showed higher CO 2 and CH 4 permeability compared to PIM-1. ![]() Phenyl-100 exhibited a high water solubility, which is related to a higher amount of aromatic rings in the polymer. The maleimide moiety increased the water affinity of the homopolymers. The effect of anthracene maleimide derivatives with a variety of aliphatic side groups on water vapor transport is discussed. Homopolymers with bulky side groups ( i-propyl-100 and t-butyl-100) experienced a strong impact of these side groups in fractional free volume (FFV) and penetrant permeability, compared to the homopolymers with linear alkyl side chains. Gas and water vapor transport properties of homopolymers and copolymers were investigated by time-lag measurements. Thermal treatment of homopolymer methyl-100 thick film was conducted to establish retro-Diels Alder rearrangement of the homopolymer. The TG-FTIR measurement of the monomer-containing methyl side group revealed that the maleimide group decomposes prior to the anthracene backbone. ![]() Polymers with different sizes and shapes of aliphatic side groups were characterized by size-exclusion chromatography (SEC), (nuclear magnetic resonance) 1H-NMR, thermogravimetric (TG) analysis coupled with Fourier-Transform-Infrared (FTIR) spectroscopy (TG-FTIR) and density measurements. In the present work, a set of anthracene maleimide monomers with different aliphatic side groups obtained by Diels Alder reactions were used as precursors for a series of polymers of intrinsic microporosity (PIM) based homo- and copolymers that were successfully synthesized and characterized.
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