Nanofiber engineering of microporous polyimides through electrospinning: Influence of electrospinning parameters and salt addition

Topuz, Fuat; Abdulhamid, Mahmoud A.; Höltzl, Tibor; Székely, György

doi:10.1016/j.matdes.2020.109280

Cited by 86 publications

(47 citation statements)

References 42 publications

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“…Pore size distribution of samples are presented in table 2. Porosity of the web measured by BET [4,5] and image processing [6,7] method and results showed that the porosity decreased by solving one part (according to table 3). Image processing shows surface porosity and BET shows total porosity.…”

Section: Morphology Of the Nano Bersmentioning

confidence: 99%

Water treatment to reduce the porosity of nanowebs

Aghayari¹

2021

Preprint

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Section: Morphology Of the Nano Bersmentioning

confidence: 99%

Water treatment to reduce the porosity of nanowebs

Aghayari¹

2021

Preprint

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“…The fiber morphology and diameters depend on the used polymer, solvent, salt addition, intrinsic properties of the polymer solution, processing conditions, and the ambient conditions. The adjustment of these parameters enabled the formation of thinner and uniform nanofibers [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Cellulose Acetate-Based Electrospun Materials with a Variety of Biological Potentials: Antibacterial, Antifungal and Anticancer

et al. 2021

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Novel eco-friendly fibrous materials with complex activities from cellulose acetate and cellulose acetate/polyethylene glycol (CA,PEG) containing 5-chloro-8-hydroxyquinoline as a model drug were obtained by electrospinning. Several methods, including scanning electron microscopy, X-ray diffraction analysis, ultraviolet-visible spectroscopy, water contact angle measurements, and mechanical tests, were utilized to characterize the obtained materials. The incorporation of PEG into the fibers facilitated the drug release. The amounts of the released drug from CA/5-Cl8Q and CA,PEG/5-Cl8Q were 78 ± 3.38% and 86 ± 3.02%, respectively (for 175 min). The antibacterial and antifungal activities of the obtained materials were studied. The measured zones of inhibition of CA/5-Cl8Q and CA,PEG/5-Cl8Q mats were 4.0 ± 0.18 and 4.5 ± 0.2 cm against S. aureus and around 4.0 ± 0.15 and 4.1 ± 0.22 cm against E. coli, respectively. The complete inhibition of the C. albicans growth was detected. The cytotoxicity of the obtained mats was tested toward HeLa cancer cells, SH-4 melanoma skin cells, and mouse BALB/c 3T3 fibroblasts as well. The CA/5-Cl8Q and CA,PEG/5-Cl8Q materials exhibited anticancer activity and low normal cell toxicity. Thus, the obtained fibrous materials can be suitable candidates for wound dressing applications and for application in local cancer treatment.

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“…Good solubility of the PI resins in the organic solvents made it possible to fabricate the NFMs via a one-step electrospinning procedure, as shown in Figure 4 b. PI-1 and PI-2 NFMs were successfully prepared using the common electrospinning conditions established in our previous work for the organo-soluble PI systems [ 33 ] and the 6FDA-based PI systems reported in the literatures [ 34 , 35 , 36 , 37 ]. The chemical structures of the PI NFMs were investigated by AFR-FTIR and 1 H-NMR measurements, respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Electrospun Fluoro-Containing Poly(imide-benzoxazole) Nano-Fibrous Membranes with Low Dielectric Constants and High Thermal Stability

et al. 2021

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The rapid development of advanced high-frequency mobile communication techniques has advanced urgent requirements for polymer materials with high-temperature resistance and good dielectric properties, including low dielectric constants (low-Dk) and low dielectric dissipation factors (low-Df). The relatively poor dielectric properties of common polymer candidates, such as standard polyimides (PIs) greatly limited their application in high-frequency areas. In the current work, benzoxazole units were successfully incorporated into the molecular structures of the fluoro-containing PIs to afford the poly(imide-benzoxazole) (PIBO) nano-fibrous membranes (NFMs) via electrospinning fabrication. First, the PI NFMs were prepared by the electrospinning procedure from organo-soluble PI resins derived from 2,2’-bis(3,4-dicarboxy-phenyl)hexafluoropropane dianhydride (6FDA) and aromatic diamines containing ortho-hydroxy-substituted benzamide units, including 2,2-bis[3-(4-aminobenzamide)-4-hydroxylphenyl]hexafluoropropane (p6FAHP) and 2,2-bis[3-(3-aminobenzamide)-4-hydroxyphenyl]hexafluoropropane (m6FAHP). Then, the PI NFMs were thermally dehydrated at 350 °C in nitrogen to afford the PIBO NFMs. The average fiber diameters (dav) for the PIBO NFMs were 1225 nm for PIBO-1 derived from PI-1 (6FDA-p6FAHP) precursor and 816 nm for PIBO-2 derived from PI-2 (6FDA-m6FAHP). The derived PIBO NFMs showed good thermal stability with the glass transition temperatures (Tgs) over 310 °C and the 5% weight loss temperatures (T5%) higher than 500 °C in nitrogen. The PIBO NFMs showed low dielectric features with the Dk value of 1.64 for PIBO-1 and 1.82 for PIBO-2 at the frequency of 1 MHz, respectively. The Df values were in the range of 0.010~0.018 for the PIBO NFMs.

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Nanofiber engineering of microporous polyimides through electrospinning: Influence of electrospinning parameters and salt addition

Cited by 86 publications

References 42 publications

Water treatment to reduce the porosity of nanowebs

Water treatment to reduce the porosity of nanowebs

Cellulose Acetate-Based Electrospun Materials with a Variety of Biological Potentials: Antibacterial, Antifungal and Anticancer

Preparation and Characterization of Electrospun Fluoro-Containing Poly(imide-benzoxazole) Nano-Fibrous Membranes with Low Dielectric Constants and High Thermal Stability

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