Computer simulation and experimental verification of morphology and gas permeability of poly(4-methyl-1-pentene) membranes: effects of polymer chain and diluent extractant

A Novel Green Diluent for the Preparation of Poly(4-methyl-1-pentene) Membranes via a Thermally-Induced Phase Separation Method

“…When the diluent was MA, PA, and SA, the membrane structure gradually changed to bicontinuous and cellular, which indicated the L-L phase separation should occur during the quenching process of the three diluent systems. As pointed by the literature [ 15 , 17 ], this phenomenon also signified that the compatibility between PMP and these fatty acids gradually became weaker in the order of LA, MA, PA, and SA. In addition, concerning the difference in the membrane structure, the compatibility between PMP and the three fatty acids should be distinguished from each other.…”

“…Therefore as listed in Table 1 , different organic solvents including dioctyl adipate (DOA), diphenyl ether (DPE), dibutyl phthalate (DBP), dioctyl phthalate (DOP) and mineral oil (MO), have all been chosen as the single diluent to prepare the PMP membranes for medical applications. Only the S-L phase separation occurred in the MO or DOA system and membranes with flaky crystal structures were normally obtained [ 6 , 13 , 14 ]; whereas the L-L phase separation could be found in the DOP, DPE, or DBP system and then the membranes with the bicontinuous structure would be obtained [ 7 , 15 , 16 , 17 ]. Also, it can be found that among the various diluent systems, only several single diluents were adopted while most of the systems used the diluent mixture to regulate the membrane structure, which is because that it is very hard to find an appropriate single diluent to prepare a PMP membrane with desirable structure via TIPS, although production and processing of the membrane with a single diluent are relatively simpler.…”

“…Besides, considering the actual medical application, the PMP hollow fiber (HF) membranes were mainly prepared for the membrane performance tests. In order to improve the membrane performance, recently people have been paying more attention to studying and understanding the effects of different process factors, including the polymer chain conformation [ 18 ], polymer concentration [ 19 ], cooling rate [ 21 , 23 ], diluent extractant [ 18 ], coagulation medium [ 9 , 11 ], et al, on the membrane structures and performances including porosity [ 7 ], dense layer [ 17 ], and mechanical properties [ 8 ] in detail. A higher gas permeability, higher water resistance, and good mechanical strength were considered as the ultimate goal for these studies.…”

Understanding the pore structure evolution of polyethylene separator with dissipative particle dynamics simulation

“…Then, the was calculated as shown in Table 2. The is slightly higher than 25 at the high temperature, 500 K, and raised to 26.69 when system temperature is reduced to 443 K. The current would be smaller than the previous reported ones 47–49 at the processing temperature, which indicates the repulsion would not be a dominant factor in the phase separation in the shear mixing process.…”

Influence of crystal orientation on stretching induced void formation in poly(4‐methyl‐1‐pentene) investigated by in‐situ small‐angle and wide‐angle X‐ ray scattering

“…3,4 Its density is 0.83 g/cm 3 , and it is the only semicrystalline polymer whose density of the amorphous part is higher than that of the crystalline part. 5,6 Benefiting from its unique physical properties, P4MP1 is widely used in the area of membrane oxygenator, [7][8][9] optical devices, 10 radiative cooling, 11,12 dielectric devices and capacitors, 13 anion-conductive membranes, 14 and so on.…”