Outstanding performance of PIM-1 membranes towards the separation of fluorinated refrigerant gases

Penetrant-induced plasticization in microporous polymer membranes

“…While this review does not cover refrigerant gases extensively, a study done by Gutie ´rrez-Herna ´ndez et al in 2023 monitored the long-term separation performance of branched PIM-1 under a 50 : 50 mixture feed of difluoromethane and pentafluoroethane at 1.3 bar and 30 1C, which was changed to a different mixture (68.9 vol% difluoromethane and 31.1 vol% 2,3,3,3-tetrafluoropropene) after four days. 522 In the first four days, the permeability of difluoromethane increased by B45% to 1325 barrer, but after the mixture was switched, the difluoromethane permeability dropped to 1244 barrer due to an increase in difluoromethane concentration, which would be expected to decrease permeability based on dual-mode sorption. 522 The permeability of difluoromethane then remained relatively constant throughout the rest of the long-term stability testing (7 days total), suggesting an opportunity and a need to further study PIM-1 and other microporous polymers for refrigerant applications.…”

Towards sustainable synthesis: a life cycle assessment of polymer of intrinsic microporosity (PIM-1) by green mechanosynthesis

“…Specically, at reactant-to-ball ratios of 1 : 64 and 1 : 128, the average molecular weight (M w ) reached 41 000 g mol −1 and 60 991 g mol −1 , respectively. While applications, particularly in membrane fabrication, oen favor PIM-1 with a high molecular weight (>100 kg mol −1 ), 34,35 it's noteworthy that Bhavsar et al demonstrated the feasibility of CO 2 gas separation membranes using PIM with an M w of approximately 50 kg mol −1 by graing polyethylene oxides onto PIM-1. 35 Similarly, research by Kim and colleagues showcased the use of PIM-1, with an M w of 50 100 g mol −1 , in the fabrication of carbonaceous membranes suited for saline water treatment.…”

Molecular Mobility and Gas Transport Properties of Mixed Matrix Membranes Based on PIM-1 and a Phosphinine Containing Covalent Organic Framework

“…These experiments gave a weight-average molecular weight of Mw = 106200 g mol –1 and a polydispersity index (PDI) of 1.8 for the PIM-1 sample. Concerning synthesis and resulting backbone topology the PIM-1 discussed here corresponds to the sample B2 considered in refs , . The FTIR spectrum of PIM-1 is given in the SI, Figure S2.…”