Residual solvent induced physical morphology and gas permeation in polyamide-imide membrane: Experimental investigation and molecular simulations

Prasad, Naresh; Babarao, Ravichandar; Madapusi, Srinivasan; Sridhar, S.; Choudhury, Namita Roy; Bhargava, Suresh K.

doi:10.1016/j.eurpolymj.2022.111012

Cited by 7 publications

(3 citation statements)

References 64 publications

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“…The presence of these macrovoids in the substructure of the M3-type membrane reveals that the viscosity of the casting solution plays an important role during the phase inversion process. It could be speculated that the improved chain entanglement of polymers in mixed solvents resulted in a higher viscosity and promoted the formation of macrovoids in the substructure of the M3 membrane, as reported by many researchers [15,18,19]. [20][21][22].…”

Section: Morphological Analysis Of Blended Membranesmentioning

confidence: 76%

Effect of Mixing Technique on Physico-Chemical Characteristics of Blended Membranes for Gas Separation

Qadir,

Suleman,

Ahmad

2023

Gases

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Polymer blending has attracted considerable attention because of its ability to overcome the permeability–selectivity trade-off in gas separation applications. In this study, polysulfone (PSU)-modified cellulose acetate (CA) membranes were prepared using N-methyl-2-pyrrolidone (NMP) and tetrahydrofuran (THF) using a dry–wet phase inversion technique. The membranes were characterized using scanning electron microscopy (SEM) for morphological analysis, thermogravimetric analysis (TGA) for thermal stability, and Fourier transform infrared spectroscopy (FTIR) to identify the chemical changes on the surface of the membranes. Our analyses confirmed that the mixing method (the route chosen for preparing the casting solution for the blended membranes) significantly influences the morphological and thermal properties of the resultant membranes. The blended membranes exhibited a transition from a finger-like pore structure to a dense substructure in the presence of macrovoids. Similarly, thermal analysis confirmed the improved residual weight (up to 7%) and higher onset degradation temperature (up to 10 °C) of the synthesized membranes. Finally, spectral analysis confirmed that the blending of both polymers was physical only.

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Section: Morphological Analysis Of Blended Membranesmentioning

confidence: 76%

Effect of Mixing Technique on Physico-Chemical Characteristics of Blended Membranes for Gas Separation

Qadir,

Suleman,

Ahmad

2023

Gases

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“…The peaks at 1664 cm −1 and 1500 cm −1 are attributed to the amide C]O and C-N stretching vibrations, respectively. [27][28][29][30] The PAI powder and electrospun bers showed almost the same FTIR spectrum feature, suggesting that electrospinning has little effect on the chemical structure of PAI.…”

Section: Resultsmentioning

confidence: 99%

Novel piezoelectric properties of electrospun polyamide-imide nanofiber membranes

Bai,

Shao,

Chang

et al. 2023

J. Mater. Chem. A

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“…Depending on the polymer chain mobility in the films and post-thermal treatment above the glass transition temperature of the polymer substrate, the spread fibers can be penetrated within the polymer films or settled on the film surface [37,44,45]. Polymer chain mobility is highly dependent on the amount of residual solvent in the polymer films [46], as shown in Scheme 2. High residual solvent content and polymer chain mobility are expected to be favorable for penetrating the spread fibers into the film surface.…”

Section: Effect Of Predrying Time On the Residual Solvent And Penetra...mentioning

confidence: 99%

New Surface Modification of Hydrophilic Polyvinyl Alcohol via Predrying and Electrospinning of Hydrophobic Polycaprolactone Nanofibers

Ahn,

Park,

Sadeghi

et al. 2024

Foods

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Despite the excellent oxygen barrier and biodegradability of polyvinyl alcohol (PVA), its poor physical properties owing to its inherent hydrophilicity limit its application. In this paper, we report a novel surface modification technique for PVA films, involving the control of the predrying conditions (i.e., amount of residual solvent) of the coated PVA film and adjusting the electrospinning process of hydrophobic polycaprolactone (PCL) nanofibers onto the PVA films. The residual solvent of the coated PVA film was varied by changing the predrying time. A shorter predrying time increased the residual solvent content significantly (p < 0.05) and the flexibility of the coated PVA film. Moreover, scanning electron microscopy depicted the improved physical binding of hydrophobic PCL nanofibers to the hydrophilic PVA surface with increased penetration depth to the PVA film with shorter drying times. The PVA/PCL composite films with different predrying times and electrospun PCL nanofibers exhibited an apparent increase in the contact angle from 8.3° to 95.1°. The tensile strength of the pure PVA film increased significantly (p < 0.05) from 7.5 MPa to 77.4 MPa and its oxygen permeability decreased from 5.5 to 1.9 cc/m2·day. Therefore, our newly developed technique is cost-effective for modifying the surface and physical properties of hydrophilic polymers, broadening their industrial applications.

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Residual solvent induced physical morphology and gas permeation in polyamide-imide membrane: Experimental investigation and molecular simulations

Cited by 7 publications

References 64 publications

Effect of Mixing Technique on Physico-Chemical Characteristics of Blended Membranes for Gas Separation

Effect of Mixing Technique on Physico-Chemical Characteristics of Blended Membranes for Gas Separation

Novel piezoelectric properties of electrospun polyamide-imide nanofiber membranes

New Surface Modification of Hydrophilic Polyvinyl Alcohol via Predrying and Electrospinning of Hydrophobic Polycaprolactone Nanofibers

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