Microstructure Analysis of Drawing Effect and Mechanical Properties of Polyacrylonitrile Precursor Fiber According to Molecular Weight

Ahn, Hyeong Sik; Gwak, Hyeon Jung; Kim, Yong Min; Yu, Woong‐Ryeol; Lee, Wonjun; Yeo, Sang Young

doi:10.3390/polym14132625

Cited by 3 publications

(2 citation statements)

References 31 publications

(48 reference statements)

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“…XRD showed that the electrospun nanofibers contained crystals ( Figure 2 ). The solvent medium, parameters, applied voltage, and polymer characteristics (molecular weight) all affect the crystal structure [ 33 ]. XRD was taken to analyze the modifications in the crystalline structure of the pristine electrospun PCL/CH/CMF nanofiber membrane.…”

Section: Resultsmentioning

confidence: 99%

Electrospun Polycaprolactone/Chitosan Nanofibers Containing Cordia myxa Fruit Extract as Potential Biocompatible Antibacterial Wound Dressings

et al. 2023

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The goal of the current work was to create an antibacterial agent by using polycaprolactone/chitosan (PCL/CH) nanofibers loaded with Cordia myxa fruit extract (CMFE) as an antimicrobial agent for wound dressing. Several characteristics, including morphological, physicomechanical, and mechanical characteristics, surface wettability, antibacterial activity, cell viability, and in vitro drug release, were investigated. The inclusion of CMFE in PCL/CH led to increased swelling capability and maximum weight loss. The SEM images of the PCL/CH/CMFE mat showed a uniform topology free of beads and an average fiber diameter of 195.378 nm. Excellent antimicrobial activity was shown towards Escherichia coli (31.34 ± 0.42 mm), Salmonella enterica (30.27 ± 0.57 mm), Staphylococcus aureus (21.31 ± 0.17 mm), Bacillus subtilis (27.53 ± 1.53 mm), and Pseudomonas aeruginosa (22.17 ± 0.12 mm) based on the inhibition zone assay. The sample containing 5 wt% CMFE had a lower water contact angle (47 ± 3.7°), high porosity, and high swelling compared to the neat mat. The release of the 5% CMFE-loaded mat was proven to be based on anomalous non-Fickian diffusion using the Korsmeyer–Peppas model. Compared to the pure PCL membrane, the PCL-CH/CMFE membrane exhibited suitable cytocompatibility on L929 cells. In conclusion, the fabricated antimicrobial nanofibrous films demonstrated high bioavailability, with suitable properties that can be used in wound dressings.

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Section: Resultsmentioning

confidence: 99%

Electrospun Polycaprolactone/Chitosan Nanofibers Containing Cordia myxa Fruit Extract as Potential Biocompatible Antibacterial Wound Dressings

et al. 2023

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“…Electrospinning is a convenient and efficient technique to immobilize a catalyst onto polymer fiber [ 26 , 27 , 28 , 29 , 30 ], and the supported particles would be adhesively fixed onto the surface of the nanofibers during the fibers’ formation process, or bonded onto active groups of polymers by coordination [ 31 , 32 ], a hydrogen bridge [ 33 ], a covalent bond [ 34 , 35 ], etc. In addition, polyacrylonitrile has excellent mechanical properties, chemical tolerance, and high affinity to organic pollutants, especially its light resistance ability, which makes it a great potential polymer support for a photo-enhanced catalyst [ 36 , 37 ]. In our previous study, iron phthalocyanine (FePc) particles were immobilized onto the surface of PAN yarns through the fifth ligand coordination between hydroxyl groups from modified PAN and Fe atoms from FePc, which showed stable and efficient catalysis in degrading dyes [ 38 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

Electrospinning of n-hemin/PAN Nanocomposite Membranes and Its Photo-Enhanced Enzyme-like Catalysis

et al. 2022

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Hemin possesses great potential in eliminating organic pollutants due to its mild reaction condition, light-harvesting efficiency, and environmental friendliness. However, it has drawbacks such as being easy to aggregate and hard to recycle, and poor stability should be improved in practical application. Herein, the subject developed an electrospinning approach to enable the hemin particulates to be immobilized onto polyacrylonitrile (PAN) nanofibers stably. Hydrogen peroxide (H2O2) was adopted as an oxidant in the system to simulate the enzymatic catalysis of hemin in an organism. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflection spectroscopy (DRS), and electron spin resonance spectroscopy (ESR) analysis was employed to discuss the morphology, structure, and mechanism of the prepared n-hemin/PAN nanocomposite membranes, and 0.02 mmol L−1 of the rhodamine B (RhB) removal activity in different conditions was also verified with these membranes. The kinetic studies showed that n-hemin/PAN nanocomposite membranes maintained excellent properties both in adsorption and degradation. Around 42% RhB could be adsorbed in the dark, while 91% RhB decolorized under xenon lamp irradiation in 110 min, suggesting the catalytic performance of n-hemin/PAN was greatly driven by light irradiation. Differing from the axial coordinated hemin complexes, n-hemin/PAN would catalyze hydrogen peroxide into •OH radicals rather than •OOH and high-valent metal-oxo species. This work provides an effective way to support hemin as nanocomposite membranes, in which the molecular interaction between polymer and hemin made their light adsorption an obvious red shift.

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Comprehensive research on the correlation between microstructure and mechanical properties of polyacrylonitrile‐based precursor fibers prepared by wet‐spinning

Liu,

Dai,

Guo

et al. 2024

J of Applied Polymer Sci

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Polyacrylonitrile (PAN)‐based precursor fibers with different mechanical properties prepared by wet‐spinning and its correlation with microstructure was researched, the primary structural factors that affecting its properties were analyzed. The tensile strength and modulus of precursor fibers increased from 4.63 cN/dtex to 9.16 cN/dtex and 99.09 cN/dtex to 168.92 cN/dtex, respectively, with the increase in crystallinity from 69.29% to 87.84% and orientation degree increased from 83.95% to 93.81%, high performance precursor fibers could be achieved by decrease in the crystallite size and interlayer spacing, these aggregation structure plays a decisive role to the mechanical properties of fibers. The integrality of aggregation structure and properties could reflected by boiling water shrinkage behavior and glass transition temperature from the side. The fracture morphology of fibers with different properties were studied by scanning electron microscope (SEM) and three fracture characteristics were observed, PF1 and PF3 presented the radial extended fracture without microfibril pull out, radial cluster fracture with the pull out of microfibril for PF2, PF4–PF6, together with the axial splitting pattern in PF6, which was revealed by microfibrils/fibrils in longitudinal and transverse combined with solution etching. Precursor fibers with less voids, without serious skin‐core, continuous arrangement, tightly stacked, well‐developed and complete oriented microfibrils/fibrils, exhibited excellent mechanical properties. Possible fracture process was given from the perspective of aggregation structure and microfibrils/fibrils, which become dominant factors determining properties of precursor fibers. Improve the performance could be achieved by regulating surface structure and cross‐sectional shape. As one of the main structural factors that determining properties, by reducing diameter could minimize the numbers and sizes of defects.

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Microstructure Analysis of Drawing Effect and Mechanical Properties of Polyacrylonitrile Precursor Fiber According to Molecular Weight

Cited by 3 publications

References 31 publications

Electrospun Polycaprolactone/Chitosan Nanofibers Containing Cordia myxa Fruit Extract as Potential Biocompatible Antibacterial Wound Dressings

Electrospun Polycaprolactone/Chitosan Nanofibers Containing Cordia myxa Fruit Extract as Potential Biocompatible Antibacterial Wound Dressings

Electrospinning of n-hemin/PAN Nanocomposite Membranes and Its Photo-Enhanced Enzyme-like Catalysis

Comprehensive research on the correlation between microstructure and mechanical properties of polyacrylonitrile‐based precursor fibers prepared by wet‐spinning

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