Effect of heat treatment on morphology and crystallinity of electrospun Poly(vinyl alcohol) nanofibers

Wijanarko, Tyas Ari Wahyu; Kusumaatmaja, Ahmad; Chotimah,; Roto,; Triyana, Kuwat

doi:10.1063/1.4958583

Cited by 18 publications

(13 citation statements)

References 8 publications

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“…In recent studies, DSC crystallinity calculation has largely been used to validate X-ray diffraction (XRD) results [ 40 , 41 ]. The authors' previous study [25] showed that PVA nanofiber has a low degree of crystallinity, and this agrees with XRD results. Low crystalline polymers (amorphous) usually have transparent properties, and the crosslinking of PVA nanofiber mats with the vapor treatment make the nanofibers more transparent due to excessive melting and the plasticizing role of the solvents.…”

Section: Resultssupporting

confidence: 85%

“…Many methods have been developed to increase the mechanical strength of nanofiber mats, including changing non-woven fiber mats into self-bundled fiber yarns [17] and reinforcing single nanofibers with other materials [ 18 , 19 , 20 , 21 ], but these methods have been complex and costly. However, one approach is enhancing at junction points in the nanofiber mats by crosslinking fibers together [ 22 , 23 ], and this can be achieved in three ways: first, the mat is heated to a temperature between its glass transition and melting temperature [ 24 , 25 ]; second, the mat is treated with glutaraldehyde (GA) [ 26 , 27 , 28 ], and third, solvent vapor treatment is applied [ 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

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Solvent vapor treatment improves mechanical strength of electrospun polyvinyl alcohol nanofibers

Rianjanu

Kusumaatmaja

Suyono

et al. 2018

Heliyon

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Electrospun nanofibers of polyvinyl alcohol (PVA) have poor mechanical strength. As such their use has often been avoided, particularly in applications that require high mechanical properties. The objective of this study is to increase the mechanical properties of PVA nanofiber mats via physical crosslinking with solvent vapor treatment using organic solvents, dimethyl sulfoxide (DMSO), N, N-dimethyl formamide (DMF), and methanol. The effect of solvent vapor treatment on PVA nanofibers is clearly observed by scanning electron microscope (SEM). The tensile strength increased by over 60%, 90%, and 115% after solvent vapor treatment with DMF at a temperature of 40 °C for 2 h, 4 h, and 8 h, respectively, compared to untreated PVA nanofibers. In addition, Young's modulus of PVA nanofiber mats also increased after DMF treatment. As a comparison, DMSO and methanol were also used in solvent vapor treatment because of differences in their polymer-solvent affinity. Results showed that the highest improvement (100%) in mechanical strength was obtained using DMF. This study shows that solvent vapor treatment offers a simple and inexpensive method that provides excellent results and is a promising alternative treatment for use in increasing the mechanical properties of electrospun nanofibers.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Solvent vapor treatment improves mechanical strength of electrospun polyvinyl alcohol nanofibers

Rianjanu

Kusumaatmaja

Suyono

et al. 2018

Heliyon

Self Cite

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“…From these results, we considered that high temperature and high humidity are the important factors that affect the morphology of CP-F. It has been reported that high temperature can destroy the PVA-based nanofibrous film [ 35 ]. In the present study, the main composition of the nanofibers of CP-F was PVA and PVP and the results revealed that CP-F, after being subjected to high temperatures, became brittle, and the structure of the nanosized fibers was absent.…”

Section: Resultsmentioning

confidence: 99%

Stability and Influence of Storage Conditions on Nanofibrous Film Containing Tooth Whitening Agent

2021

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Carbamide peroxide (CP), a tooth whitening agent, is chemically unstable. The present study explores stability enhancement of CP by loading in a nanofibrous film (CP-F) composed of polyvinyl alcohol/polyvinylpyrrolidone/silica mixture, using an electrospinning technique. Kept at a temperature range of 60–80 °C for 6 h, CP in CP-F showed significantly higher stability than that in a polymer solution and in water, respectively. Degradation of CP in CP-F could be described by the first order kinetics with the predicted half-life by the Arrhenius equation of approximately 6.52 years. Physicochemical properties of CP-F after long-term storage for 12 months at different temperatures and relative humidity (RH) were investigated using scanning electron microscopy, X-ray diffractometry, differential scanning calorimetry, and Fourier transform infrared spectroscopy. It was found that high temperature and high humidity (45 °C/75% RH) could enhance water absorption and destruction of the nanofibrous structure of CP-F. Interestingly, kept at 25 °C/30% RH, the nanofibrous structure of CP-F was not damaged, and exhibited no water absorption. Moreover, the remaining CP, the mechanical properties, and the adhesive properties of CP-F were not significantly changed in this storage condition. It is concluded that the developed CP-F and a suitable storage condition can significantly improve CP stability.

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Section: Morphology and Compositionmentioning

confidence: 94%

“…The partially carbonized fibers formed the grey tone due to the relatively low atomic mass of carbon. It must be noted that the heat treatment could result in the morphology changing of the composite fiber as also indicated in [17]. Energy Dispersive Spectrum (EDS) of X-ray diffraction spot analysis was used to identify the elemental composition of the selected locations.…”

Section: Morphology and Compositionmentioning

confidence: 99%

Reaction Spinning Titanium Dioxide Particle-Coated Carbon Fiber for Photoelectric Energy Conversion

Yuan

Wei

Martinez

et al. 2019

Fibers

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In this paper, a titanium dioxide particle coated carbon fiber was prepared by reaction spinning. Polyacrylonitrile (PAN) was used as the precursor to generate a continuous carbon nanofiber. A solution containing 10% wt PAN polymer dissolved in dimethylformamide (DMF) was made as the core fluid. The sheath fluid contains 10% titanium (IV) isopropoxide, 85% ethanol, and 5% acetic acid. The two solutions were co-spun onto an aluminium plate covered with a layer of soft tissue paper. A titanium hydroxide layer formed at the surface of the PAN fiber through the hydrolysis of titanium isopropoxide due to the moisture absorption in the co-spinning process. The reaction spun fiber was converted to a partially carbonized nanofiber by the heat treatment in air at 250 °C for two hours, then in hydrogen at 500 °C for two hours. During the early stage of the heat treatment, the titanium hydroxide decomposed and produced titanium dioxide nanoparticles at the surface of the carbon fiber. The structure and composition of the carbonized fiber were studied by scanning electron microscopy (SEM). The photosensitivity of the particle-containing fiber was characterized by measuring the open circuit voltage under visible light excitation. The photoelectric energy conversion behavior of the fiber was confirmed by open circuit potential measurement. The potential applications of the composite fiber for photovoltaics and photonic sensing were discussed.

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Effect of heat treatment on morphology and crystallinity of electrospun Poly(vinyl alcohol) nanofibers

Cited by 18 publications

References 8 publications

Solvent vapor treatment improves mechanical strength of electrospun polyvinyl alcohol nanofibers

Solvent vapor treatment improves mechanical strength of electrospun polyvinyl alcohol nanofibers

Stability and Influence of Storage Conditions on Nanofibrous Film Containing Tooth Whitening Agent

Reaction Spinning Titanium Dioxide Particle-Coated Carbon Fiber for Photoelectric Energy Conversion

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