Syntheses of Colorless and Transparent Polyimide Membranes for Microfiltration

Kim, Jong Won; Chang, Jin‐Hae

doi:10.3390/polym12071610

Cited by 14 publications

(10 citation statements)

References 40 publications

(43 reference statements)

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“…These hydrogen bonds between the CPI main chains interfere with free chain mobility, resulting in an increase in T g . Similar papers have been previously published [ 30 ]. Figure 3 shows the DSC thermograms of the CPI blend films containing various PVA wt% contents.…”

Section: Resultssupporting

confidence: 59%

Colorless and Transparent Polyimide Microporous Film with Excellent Physicochemical Property

et al. 2021

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4,4′-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA) as a dianhydride and bis(3-aminophenyl) sulfone (APS) and bis(3-amino-4-hydroxyphenyl) sulfone (APS-OH) as diamines were used to synthesize two types of poly(amic acid) (PAA). Varying amounts (0–5.0 wt%) of water-soluble poly(vinyl alcohol) (PVA) were mixed with PAA, and the resulting blend was heat-treated at different stages to obtain the colorless and transparent polyimide (CPI) blend films. The synthesized blended film completely removed water-soluble PVA in water. The possibility as a porous membrane according to the pore size varied according to the amount of PVA was investigated. The dispersibility and compatibility of CPI containing APS-OH monomer were higher than those of the APS monomer. This could be attributed to the hydrogen-bonding interactions between the CPI main chains and PVA. Scanning electron microscopy was conducted to characterize the material. The results revealed that the pore size of the CPI blend film increased as the PVA concentration increased. It was confirmed that uniform pores of μm-size were observed in CPI. The thermal stabilities, morphologies, optical properties, and solubilities of two CPIs obtained using APS and APS-OH monomers were investigated and their properties were compared with each other.

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Section: Resultssupporting

confidence: 59%

Colorless and Transparent Polyimide Microporous Film with Excellent Physicochemical Property

et al. 2021

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“…Numerous publications report that imide-based membranes are extensively used for water separation since they possess good mechanical stability, high thermal resistance and high water vapor permeability [ 57 , 58 , 59 ]. It is known that the imide group increases the polarity of the molecule and provides an environment for water molecules to form hydrogen bonding [ 60 , 61 , 62 ]. Hence, the introduction of this group into the polymer chain would lead to an improvement in the interaction between the water molecule and the polymer.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Side Chain Effect on Gas and Water Vapor Transport Properties of Anthracene-Maleimide Based Polymers of Intrinsic Microporosity

et al. 2021

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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. 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. The TG-FTIR measurement of the monomer-containing methyl side group revealed that the maleimide group decomposes prior to the anthracene backbone. Thermal treatment of homopolymer methyl-100 thick film was conducted to establish retro-Diels Alder rearrangement of the homopolymer. Gas and water vapor transport properties of homopolymers and copolymers were investigated by time-lag measurements. 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. The effect of anthracene maleimide derivatives with a variety of aliphatic side groups on water vapor transport is discussed. The maleimide moiety increased the water affinity of the homopolymers. Phenyl-100 exhibited a high water solubility, which is related to a higher amount of aromatic rings in the polymer. Copolymers (methyl-50 and t-butyl-50) showed higher CO2 and CH4 permeability compared to PIM-1. In summary, the introduction of bulky substituents increased free volume and permeability whilst the maleimide moiety enhanced the water vapor affinity of the polymers.

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“…Therefore, optically transparent PI (CPI) can be synthesized by changing the monomer structure. Kim and Chang [ 53 ] blended poly (amic acid) (PAA) and PVA with PI, and then, they heat-treated them to obtain a blend film of CPI and PVA. After removing PVA, a porous CPI film with high transmittance was obtained.…”

Section: Optically Transparent Materialsmentioning

confidence: 99%

Preparation and Applications of Electrospun Optically Transparent Fibrous Membrane

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The optically transparent electrospun fibrous membrane has been widely used in many fields due to its simple operation, flexible design, controllable structure, high specific surface area, high porosity, and unique excellent optical properties. This paper comprehensively summarizes the preparation methods and applications of an electrospun optically transparent fibrous membrane in view of the selection of raw materials and structure modulation during preparation. We start by the factors that affect transmittance among different materials and explain the light transmission mechanism of the fibrous membrane. This paper also provides an overview of the methods to fabricate a transparent nanofibrous membrane based on the electrospinning technology including direct electrospinning, solution treatment after electrospinning, heat treatment after electrospinning, and surface modification after electrospinning. It further summarizes the differences in the processes and mechanisms between different transparent fibrous membranes prepared by different methods. Additionally, we study the utilization of transparent as-spun membranes as flexible functional materials, namely alcohol dipstick, air purification, self-cleaning materials, biomedicine, sensors, energy and optoelectronics, oil–water separation, food packaging, anti-icing coating, and anti-corrosion materials. It demonstrates the high transparency of the nanofibers’ effects on the applications as well as upgrades the product performance.

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Syntheses of Colorless and Transparent Polyimide Membranes for Microfiltration

Cited by 14 publications

References 40 publications

Colorless and Transparent Polyimide Microporous Film with Excellent Physicochemical Property

Colorless and Transparent Polyimide Microporous Film with Excellent Physicochemical Property

Investigation of the Side Chain Effect on Gas and Water Vapor Transport Properties of Anthracene-Maleimide Based Polymers of Intrinsic Microporosity

Preparation and Applications of Electrospun Optically Transparent Fibrous Membrane

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