A facile synthesis of mixed soft-segmented poly(urethane-imide)-polyhedral oligomeric silsesquioxone hybrid nanocomposites and study of their structure-transport properties

Abstract

The structure-transport properties of mixed soft-segmented poly(urethane-imide) (MSPUI) membranes and their microstructures were investigated. Polypropylene glycol, polycaprolactone diol and bis(3-aminopropyl)-terminated polydimethylsiloxane were used as the soft segments in the membrane synthesis via a three-step polymerization reaction. The chemical structures of the MSPUI membranes were characterized using attenuated total reflectance Fourier transform infrared spectroscopy. Morphology and surface properties of the membranes were studied using scanning electron and atomic force microscopy techniques. Surface energy measurements indicated the enrichment of the hydrophobic soft segment in the membranes. The amorphous nature of the polymers was analysed using wide-angle X-ray diffraction. The effect of morphology on the permeability and selectivity of the membranes is discussed. Finally, membrane structure-transport property relationships were correlated.

Molecular Brushes with a Polyimide Backbone and Poly(ε-Caprolactone) Side Chains by the Combination of ATRP, ROP, and CuAAC

“…With simple mixing of homopolymer PI and PCL, for example, through a common solvent, phase separation of polymers is observed at the macroscopic level [ 15 ]. A more uniform phase system of PI and PCL is obtained by synthesizing chemically bonded PI and PCL blocks [ 15 , 16 , 17 , 18 , 19 , 20 ]. Until recently, the covalent bonding of these polymers was carried out either by stepwise polycondensation, leading to the production of linear alternative segmented (or multisegmented) block copolymers [ 18 , 19 ], or by cross-linking between PI and PCL chains in a polymer mixture or between PI and PCL layers in a multilayer coating [ 16 , 17 , 20 ].…”

“…A more uniform phase system of PI and PCL is obtained by synthesizing chemically bonded PI and PCL blocks [ 15 , 16 , 17 , 18 , 19 , 20 ]. Until recently, the covalent bonding of these polymers was carried out either by stepwise polycondensation, leading to the production of linear alternative segmented (or multisegmented) block copolymers [ 18 , 19 ], or by cross-linking between PI and PCL chains in a polymer mixture or between PI and PCL layers in a multilayer coating [ 16 , 17 , 20 ]. A valuable feature of such copolymers is microphase separation [ 17 ], which gives them new interesting, for example, membrane properties.…”

“…Until recently, the covalent bonding of these polymers was carried out either by stepwise polycondensation, leading to the production of linear alternative segmented (or multisegmented) block copolymers [ 18 , 19 ], or by cross-linking between PI and PCL chains in a polymer mixture or between PI and PCL layers in a multilayer coating [ 16 , 17 , 20 ]. A valuable feature of such copolymers is microphase separation [ 17 ], which gives them new interesting, for example, membrane properties. Thus, based on multisegmented linear block copolymers containing segments of polyurethanimide and PCL, effective diffusion membranes have been developed for the separation of binary mixtures of organic liquids [ 17 ].…”

Gas permeation properties of cellulose acetate/silica nanocomposite membrane

“…[5][6][7][8] Recent researches have shown that the addition of inorganic nanoparticles such as silica, zeolites, carbon nanotubes, metal organic frameworks(MOFs), graphene, and graphene oxide (GO) into the polymer matrix improve the performance of membranes. [15][16][17][18][19][20][21][22] Other mixed matrix membranes such as poly(vinylidene fluoride) (PVDF)/silica, [23] PEG/silica, [24] poly(4-methyl-2-pentene) (PMP)/silica, [25][26][27] poly(1-trimethylsilyl-1-propyne) (PTMSP)/silica [28][29][30][31] and polyacrylonitrile/silica, [24] poly(2,2-bis (trifluoromethyl)-4,5difluoro-1,3-dioxoleco-tetrafluoroethylene) (AF2400)/silica [32] have been investigated for improvement in permeation properties of nascent polymers. They observed that the O 2 permeability for MMM was four times greater than that of pure PSf, and CH 4 permeability was increased more than five times than that of pure PSf.…”

“…The mixed matrix membranes have crossed the Robeson's upper bond by increasing the silica nanoparticles content of them. Between various studies, focusing on polyimide membranes is significant, by adding any type of inorganic materials such as SiO 2 and TiO 2 . Other mixed matrix membranes such as poly(vinylidene fluoride) (PVDF)/silica, PEG/silica, poly(4‐methyl‐2‐pentene) (PMP)/silica, poly(1‐trimethylsilyl‐1‐propyne) (PTMSP)/silica and polyacrylonitrile/silica, poly(2,2‐bis (trifluoromethyl)‐4,5‐difluoro‐1,3‐dioxoleco‐tetrafluoroethylene) (AF2400)/silica have been investigated for improvement in permeation properties of nascent polymers.…”