Modified Polyacrylonitrile Fiber Research Articles

Synthesis of spiroindoline derivatives and biphenyl compounds in green solvent via a “capture–release” mechanism using modified polyacrylonitrile fiber as a catalyst

Green synthesis of critical bioactive molecules and fine chemicals is attracting increasing interest. This study investigates the use of two distinct functionalized polyacrylonitrile (PAN) fibers (PANEDBPF and PANEDBP-Pd0F) as effective catalysts in a green solvent comprising ethanol and water. Firstly, a PAN fiber was modified using 2-(diphenylphosphino) ethylamine, a strongly nucleophilic phosphine compound, to obtain PANEDBPF. Spiroindoline derivatives were obtained in 98 % yields when the reaction was conducted using 5 mol% of PANEDBPF as the catalyst at 70 °C for 30 min. Next, we loaded PdNPs onto PANEDBPF to obtain PANEDBP-Pd0F. When the Suzuki coupling reaction was conducted at room temperature (25 °C) using 0.5 mol% of PANEDBP-Pd0F, the products were obtained in an extremely high yield of 99 %. Additionally, the unique enrichment of the substrate by the functionalized fibers during the reaction and the subsequent release of the product from the microenvironment conform to the “capture–release” reaction mode of catalysis. Both PANEDBPF and PANEDBP-Pd0F demonstrated good gram-scale amplification, repeatability, catalytic activity, and stability. Hence, they are highly promising candidates for green chemistry applications.

Določanje obstojnosti funkcionaliziranih tekstilij na osnovi kopolimerov akrilonitrila na toplotno in toplotno-oksidativno razgradnjo

Acrylonitrile is widely used to produce carbon fibres, household textiles, artificial fur, etc. The modification of polyacrylonitrile fibres in an alkaline medium is extended in the production of textile sorbents. The scientific direction of fibre modification through surface activation using hydrogen peroxide is of scientific interest. However, the thermal and thermophysical properties of the samples are not examined. Therefore, interest arises when analysing the effect of polyacrylonitrile textile material functionalization on the resistance of fibres to thermal oxidation and thermal degradation. The study of thermogravimetry and differential thermogravimetry thermooxide of polyacrylonitrile – modified fibres is carried out using thermogravimetric analysis to research the thermal oxidation and thermal degradation of modified polyacrylonitrile fibre samples. A change in the rate of thermal oxidative-degradation in the process of functionalization was identified in this research. A change in the loss of mass of the sample under different conditions of functionalization was also identified. The total glass transition of the polyacrylonitrile was achieved by heating the polymer to 130 °C. The intensification self-regulation of the structure of the polymeric material through the formation of the mesophase was released at the temperature of around 100 °C. During the heating of the initial polyacrylonitrile textile material to the temperature of 70‒80 °C, a weakening of intermolecular contacts was observed, which led to an increase in the mobility of macromolecular segments. The temperature of 78 °С was considered to be the initial glass transition temperature Tg,t1 and Tg,t2 – 121 °С as the final temperature for the original sample. However, if the temperature exceeded 130 °C, chemical changes in the polymer occurred, in particular, the process of cyclization. The analysis of the thermogravimetry data of thermally oxidized samples resulted in the retention of the complex stepwise nature of decomposition inherent in the initial fibrous material based on acrylonitrile copolymers. The conducted analysis showed the absence of significant changes in the reasonable conditions of chemical modification and practical operation of textile materials. The physical and mechanical properties of functionalized textile materials based on acrylonitrile copolymers were studied. As a result of surface functionalization, an insignificant strength reduction of functionalized textile materials occurred.

Fire retardants giving special properties to fibers and textile materials based on them

The fire-retardant properties of modified polyacrylonitrile fibers with phosphorus-containing polymers, as well as nitrogen and brominecontaining flame retardants, have been studied. It has been shown that, in contrast to low molecular weight fire retardants, polymer and oligomer fire retardants give fibers higher fire-retardant properties. The results of determining the flammability of samples showed that the treatment of polyacrylonitrile fibers with oligomeric flame retardants based on the developed flame retardants improves the fire-retardant properties of fibers and materials based on them. As a result of comprehensive research, it was established that for the manufacture of fire-resistant material it is advisable to use the optimal ratio of “polyacrylonitrile fiber - fire retardant”. Carrying out fire-retardant treatment of polyacrylonitrile material with compositions of 3-chloro-1,2-hydroxypropane with 2,4,6-triamino-1,3,5-triazine makes it possible to obtain fabrics with a reduced fire hazard and with the required strength parameters. Also, in the work, based on kinetic and spectroscopic studies and taking into account literature data, a mechanism of oligomeric fire retardant is proposed, which gives fibers and textile materials special fire resistance properties.

Modified Polyacrylonitrile Fiber Silver Complexes To Display Semiconducting Behavior: Synthesis, Characterization, and Photocatalytic Oxidative Capacity

Modified Polyacrylonitrile Fiber Silver Complexes To Display Semiconducting Behavior: Synthesis, Characterization, and Photocatalytic Oxidative Capacity

Effect of fiber surface functionalization on adsorption behavior of uranium from seawater desalination brine

Inspired by the easy availability and modification of fiber-like materials for water treatment and sorption applications, the functionalized natural fiber luffa cylindrica (LC) and synthetic fiber polyacrylonitrile (PAN) have been designed for the uranium adsorption. Seawater desalination brine has a significantly higher concentration of uranyl ion, so it is very meaningful to extract uranyl ions from it. In this paper, the seawater from seawater desalination plant at various treatment stages was collected to evaluate uranium adsorption performance. The effect of flocculant and scale inhibitors on uranium adsorption performance of functional fibers was also studied. The oxime/guanidine co-modified luffa cylindrica fiber (WGLC), guanidine/amidoxime co-modified polyacrylonitrile fiber (PAN-G-AO) and polyethyleneimine modified polyacrylonitrile fiber (PAN-PEI) were synthesized. PAN-G-AO showed excellent uranium capture performance with a high saturation adsorption capacity of 490.20 mg g−1 and rapid adsorption equilibrium at 15 min. Amount of uranium adsorption of three materials declined when flocculant and scale inhibitors were added. The results of adsorption experiments in various stages of seawater desalination solution for 30 days showed that adsorption materials PAN-G-AO had the largest adsorption capacity (18.6 μg g−1) in the concentrated desalinated seawater, which demonstrate promising application potential of the functionalized fiber materials for uranium adsorption from desalinated concentrated seawater.

PANF supported polymeric ionic liquids: Amphiphilic microenvironment for efficient preparation of biodiesel

Efficient and green production is extremely essential to the development of society and environment, and supported polymeric ionic liquids as heterogeneous catalysts are the current research hotspot for chemists. In this study, imidazolium ionic liquids were supported on modified polyacrylonitrile fiber (PANF) by reversible addition fragmentation chain transfer (RAFT) polymerization, and a series of fiber-supported basic catalysts (PANF@VIm-nX) were obtained by ion exchange with different anions. The modified fibers were characterized by FT-IR, XRD, TGA, SEM, 13C CP-MAS NMR and ICP-MS. The results show that the modified fibers are successful and the catalysts have sufficient active sites and mechanical strength to meet the application requirements. Several supported poly(ionic liquid)s catalysts were used to promote the transesterification of methanol and soybean oil to produce biodiesel. The effects ofionicliquidswith different structures on the reaction yield were sufficiently investigated. The anions of ionic liquids and the length of hydrophobic alkyl chains have synergistic effects on the catalytic performance of the catalyst. The fiber catalyst (PANF@VIm-8OMe) with 8 carbon alkyl chains and OMe anion showed the optimal catalytic efficiency. The yield of biodiesel was as high as 95.4 % within 6 h with a catalyst dosage of 4 wt% and a methanol to oil ratio of 30:1 at 60 ℃. In addition, the fiber catalyst had excellent stability and durability, which could be recycled more than 6 times. Finally, the fiber could be twined on the stirring impeller of the reactor, indicating its potential industrial application prospect.

Purification performance of modified polyacrylonitrile fiber-activated carbon fiber filter for heavy metal ions.

A heavy metal ion adsorbent (HFPANF) with high surface area was obtained from polyacrylonitrile fibers with fibrillation and alkali hydrolysis, and an activated carbon fiber filter was prepared by using HFPANF as the binder. The surface area of polyacrylonitrile was 48.64 m2/g due to fibrillation, which also led to the carboxyl content of the HFPANF up to 3.4mmol/g. Batch adsorption experiments on Cu2+ and Pb2+ showed that the adsorption capacities of HFPANF for Cu2+ and Pb2+ were 47.5mg/g and 54.3mg/g. The adsorption kinetics showed that the adsorption reached equilibrium at 90min and that the adsorption followed the pseudo-second order model. It indicates that the adsorption process is chemisorption. HFPANF formed a single tooth chelate with Cu and a double tooth chelate with Pb. HFPANF-ACF filter was prepared by wet molding technique. When the HFPANF content was 30%, the filter reached a compressive strength of 15.37MPa and its maximum flux was 180 L/h. 2.5mg/L of Cu and Pb were used for dynamic adsorption experiments and the heavy metal removal rate was still above 95% after filtering 600 L. The pressure drop of HFPANF-ACF filter was much smaller compared with that of GAC filter due to the combined effect of fibrillated nanofibers and ACF, which can improve the filtration efficiency of the filter.

Preparation of double-layer film modified polyacrylonitrile fiber modifier for designing and performance evaluation of PAN/SBS composite asphalt

• Innovative application of APTES, co-deposition of PEI and PDA in the modification of polyacrylonitrile fibers. • Double-layer membrane structure modified polyacrylonitrile fibers. • P-P/A-P/PAN and A-P/PAN with higher surface free energy, roughness and adhesion. • P-P/A-P/PAN/SBS@MA and A-P/PAN/SBS@MA had better viscoelastic properties. • P-P/A-P/PAN/SBS@MA and A-P/PAN/SBS@MA had better low temperature crack resistance and high temperature adhesion properties. To further enhance the properties of polyacrylonitrile (PAN) fiber incorporated modified asphalt, a new method of PAN fiber modification with a double membrane was developed. The influence of interface characteristics of modified fiber on the properties of fiber-reinforced asphalt was revealed from the free energy of the fiber surface and the adhesion between the modified fiber and matrix asphalt. Two types of PAN modified fibers with single-layer membrane structure (A-P/PAN) and double-layer membrane structure (P-P/A-P/PAN) were prepared, which were applied to synthesize three types of modified asphalts (Mas), i.e., PAN/SBS@MA, A-P/PAN/SBS@MA, and P-P/A-P/PAN/SBS@MA. Dynamic shear rheometer (DSR) experiment showed that at 46℃, the G*, G', and G' of P-P/A-P/PAN/SBS@MA were 24%, 19%, and 37% higher than those of PAN/SBS@MA. Similarly, at 175 ℃, the maximum yield strength of P-P/A-P/PAN/SBS@MA was 16.38% and 32.7% higher than those of A-P/PAN/SBS@MA and PAN/SBS@MA, respectively, which was attributed to the better surface free energy and adhesion work of the modified fibers. The surface contact angle test results showed that free energy of the surface and adhesion work of P-P/A-P/PAN fibers are 62% and 26.5% higher than those of PAN fibers, respectively. Scanning electron microscopy, atomic force microscopy, and UV-Vis tests indicated that the fiber's surface has successfully constructed a double-layer membrane structure. The fluorescent microscopy and cryo-SEM tests of the modified asphalt further confirmed that the modified PAN fiber had better interfacial interaction with the base asphalt. This study shows that the double-layer film modified PAN fiber composite SBS asphalt has good viscoelastic properties, high temperature adhesion, and low temperature fracture resistance, and hence carries critical practical engineering applications for highways, low temperature area pavements, airport pavements, and construction pavement.

Effect of PAN fiber with bionic layered surface structure generated in situ by Fenton reaction on performance of SBS/RP asphalt binder

• Innovative application of Fenton reaction in the modification of polyacrylonitrile fibers. • Biomimetic multi-layered structure modified polyacrylonitrile fibers. • KF-PAN/SBS/RP modified asphalt had better viscoelastic performance. • KF-PAN/SBS/RP modified asphalt had better low temperature anti-cracking performance, high temperature stability and fatigue damage resistance. • KF-PAN/SBS/RP modified asphalt had better rutting resistance and high temperature adhesion performance. In this study, a surface modified polyacrylonitrile fiber (KF-PAN) with a fish-scale whisker-like biomimetic hierarchical structure was successfully prepared via in situ competition effect of Fenton reaction. The modified fibers were used as secondary modifiers to prepare fiber-reinforced styrene–butadienestyrene (SBS) block copolymers and rubber powder (RP) modified asphalt binders (KF-PAN/SBS/RP). Energy dispersive spectroscopy, scanning electron microscopy, and atomic force microscopy analyses revealed the successful construction of bionic hierarchy on the fiber surface, and confirmed rough surface of the KF-PAN fibers. The hierarchical structure of the fiber surface acted as a buffer in the asphalt and strengthened the mutual interaction of the fiber and asphalt. Dynamic rheometer shear and strip-tensile tests showed that the KF-PAN/SBS/RP modified asphalt exhibited better viscoelasticity, rutting resistance, and tensile properties than the PAN/SBS/RP modified asphalt. The linear amplitude sweep test showed that KF-PAN/SBS/RP modified asphalt had better fatigue resistance. Thermogravimetric analysis tests indicated that the surface bionic structure of KF-PAN fibers boosted thermal stability of the fibers, which in turn enhanced the thermal stability of KF-PAN/SBS/RP modified asphalt. Fluorescence microscopy analysis showed that incorporating KF-PAN fibers improved the SBS and RP microstructure inside the asphalt, forming a good mesh structure, and alleviating the stress concentration phenomenon in SBS/RP asphalt under external traffic load.

Carbon-dot-modified polyacrylonitrile fiber as recyclable adsorbent for removing anionic, cationic, and zwitterionic perfluorooctane sulfonates from water

There are few adsorbents that can efficiently adsorb perfluorooctane sulfonate (PFOS) with differently polarized head-groups. In the present study, carbon dot (CD)-modified polyacrylonitrile fiber (PAN-g-CD) was found to be a good adsorbent for removing PFOS and its derivatives with zwitterionic or cationic head-groups from neutral water. The maximum adsorption capacities at 25 °C were found to be 1.28, 1.75, 1.87, and 2.11 mmol/g for PFOS, cationic PFOS, betaine-type PFOS, and PFOS with an amine oxide head-group, respectively. Adsorption kinetic models indicated that the surface of PAN-g-CD is energetically heterogeneous and that chemisorption occurs during the adsorption of PFOS and its derivatives. The Sips and Hill isotherm adsorption models were found to be most appropriate, and they indicated that PFOS derivatives were more preferentially adsorbed than PFOS by PAN-g-CD. The high-efficiency and wide substrate range of PAN-g-CD adsorption may be ascribed to its zwitterionic nature and its hydrophobic CDs. Moreover, PAN-g-CD can be regenerated and reused up to four times without pronounced loss of adsorption capacity.

Carbohydrazide modified polyacrylonitrile fiber as efficient and recyclable furfural adsorbent

A novel carbohydrazide functionalized polyacrylonitrile fiber (PANJF) was designed and prepared for removal of furfural from water. Compared with other amino-containing functionalized fibers, the PANJF fiber exhibits the highest adsorption capacity due to the highest reactivity of carbohydrazide. Batch experiments were performed to explore the influence of pH, initial concentration of furfural, dosage of adsorbent, adsorption time, and temperature on the process of adsorption. Under the optimized condition, the maximum adsorption capacity of PANJF for furfural reaches 140.4 mg g−1. Kinetic and isothermal curves show that the adsorption process is in accordance with the pseudo-second-order model and the Langmuir isothermal adsorption model. Furthermore, the thermodynamic result indicates that the furfural adsorption on PANJF is an endothermic and spontaneous process. More satisfactorily, the PANJF still maintains 90% removal efficiency even after five cycles, which certifies it is an excellent scavenger and can be utilized to remove furfural in practice.

Modification of Polyacrylonitrile Fibers with Silk Fibroin Nanoparticles. Dyeing of Pan Fiber with Fibroin Nanoparticles by Acid Dyes

Modification of Polyacrylonitrile Fibers with Silk Fibroin Nanoparticles. Dyeing of Pan Fiber with Fibroin Nanoparticles by Acid Dyes

Ionic microenvironment constructed in quaternary ammonium modified polyacrylonitrile fiber for efficient CO2 fixation

Fiber-supported quaternary ammonium catalysts for the fixation of CO2 with epoxides were designed and prepared via amination and quaternization of polyacrylonitrile fiber, followed by ion exchange with different anions. The impact of different quaternary ammonium structures and counter anions on the reaction yields was investigated. A fiber catalyst (PANT-UdAF-I) with a C11 carboxylic acid chain and iodide counter anion exhibited excellent catalytic activity in the fixation of CO2 with epoxides under mild and solvent-free conditions (80 °C, 0.1 MPa) with a very low catalyst amount (0.5 mol%), and diverse cyclic carbonates were obtained in yields between 24–99 %. PANT-UdAF-I could be conveniently separated by filtration and showed good recyclability and durability till the 4th cycle. Novel cooperative catalytic mechanism is proposed where the ionic microenvironment plays a crucial role to stabilize the ionic intermediates and lowers the activation energy of the reaction.

CHEMICAL MODIFICATION OF POLYACRYLONITRILE BY HYDROXYLAMINE TO OBTAIN ION EXCHANGE SORBENTS

. Anion exchange fiber materials were obtained by modification of polyacrylonitrile fiber “Nitron” from hydroxylamine. It was shown by potentiometric titration and using of IR spectroscopy that obtained polymers have an amidoxym- and hydroxamic groups in composition. Influence of different parameters on the modification process was investigated and conditions of obtain of ionites with high exchanging volume and chemostability were determined. For impart of chemostability to fibers their modification was carried out in the presence of cross - linking agent - hydrazine. It was determined that reaction kinetics was described by parameters typical to heterophase processes and the investigated reaction has a first order by hydroxylamine concentrations

Modification of Polyacrylonitrile Fibers with Fibroin Nanoparticles. Production and Attachment of Fibroin Nanoparticles to Pan Fiber

An aqueous solution of fibroin nanoparticles, obtained as a result of thermal hydrolysis of the waste products from silk fibers, was used to modify polyacrylonitrile fibers. According to light scattering data, the fibroin nanoparticles in aqueous solution had hydrodynamic radii of 75-95 nm. It was established by chromato-mass spectroscopy that the nanoparticles contain oligomeric fragments of a polypeptide chain and the products from their condensation with the formation of cyclic diketopiperazines. In the IR spectra of the fibers after treatment with fibroin nanoparticles there are bands associated with the absorption of N–H groups. The intermolecular interaction between the carbonyls of PAN in the fiber and the active groups of the fibroin oligomers can be judged from the shift of the C=O bands of itaconic acid into the low-frequency region and from the increase in the absorption of the ester groups. Strong attachment of the fibroin nanoparticles to the PAN fiber is favored by chemical reaction between the carboxyls of the itaconic acid in the structure of the fiber and the amino groups of the fibroin fragments. The increase of the relative nitrogen content after modification of the PAN fibers with fibroin nanoparticles is confirmed by the results of elemental analysis.

Surface-Functionalized Polymer Fibers for Highly Efficient Removal of Metal Ions from Aqueous Solution

Lots of various techniques are applied to remove heavy metal ions from the environment. Adsorption method is well known as a very simple and economic technique. Herein, we reviewed the effective functionalization and modification of polyacrylonitrile fibers which be used as adsorbents for efficient adsorption and selective removal of metal ions from aqueous solution. Polyacrylonitrile fibers are known as good adsorbents due to its large surface and fluffy structure as well as excellent weatherability and stability for general chemicals. The cyano group in polyacrylonitrile molecule can be easily modified with various designed fuctionalized chemicals with special chelating groups according to application field. In this review, we summarized the general modification methods, adsorption techniques, effect of pH, initial concentration of ions, effect of contact time and desorption or recovery of polyacrylonitrile fibers. A large kind of metal ions including Cu(II), Ni(II), Pb(II), Hg(II), Fe(III), Ag(I), Zn(II), Cr(III), Cr(VI), Cd(II), Pt(II) and Pd(II) are all recorded.

Development of modified polyacrylonitrile fibers for improving tribological performance characteristics of thermoplastic polyurethane material in water‐lubricated sliding bearings

Thermoplastic polyurethane (TPU) is one of the most popular marine bearing materials because of its excellent characteristics. However, severe wear often occurs under some extreme conditions. In order to improve the service life of bearing material, this work introduced the polyacrylonitrile (PAN) fiber as a reinforcement material to further enhance TPU tribological properties. Considering that the bearing material does not process self‐lubricating or cannot form a stable water film under some working conditions, the PAN fiber was hydrophilically modified to alleviate this problem. The effects of fiber addition, operation speed, and applied load on the tribological properties of the composites were examined by using a tribo‐tester. The friction coefficient of the samples, the surface morphology after rubbing, and the wear loss, and so on, were also comprehensively analyzed. It was found that the friction coefficient of 30% modified PAN fiber at 500 r/min and 0.8 MPa load was 0.08, and its friction coefficient was 81.8% lower than the pure sample under the same working condition, this is mainly due to the high hydrophilicity of the modified PAN fiber, which makes it easier to form a water film between the composite material and the copper disc. Furthermore, adhesive wear occurred in unmodified samples, while modified samples contained abrasive wear. This new material modification method and design idea can be used for improving the performance of water‐lubricated bearing materials.

Study of PAN Fiber and Iron ore Adsorbents for Arsenic Removal

The main idea to conduct this study is the treatment of hazardous arsenite (As+3) and arsenate (As+5)from water by two efficient adsorbetns i.e. polyacrylonitrile fiber (organic) and iron ore (inorganic). Polyacrylonitrile (PAN) fibers were chemically modified prior to loading iron using a solution of diethylenetriamine and aluminum chloride hexahydrate. The characterization of PAN fibers was performed through FTIR spectroscopy, which shows the binding of functional groups on PAN fibers surfaces. Atomic absorption spectrometer (AAS) was used to analyze arsenic concentration in samples. The impact of pH, dosage, shaking (contact) time and shaking speed was studied and parameters were optimized for further study. The highest adsorption of 98% is exhibited by modified PAN fiber for As+5 while for As+3 removal is 80%. Modified PAN also showed higher adsorption capacity of 42×103μg/g for As+5 which is better than the As+3 adsorption capacity 33×103 μg/g. Overall results demonstrated that MPAN adsorbent is better than the iron ore adsorbent for the treatment of both As+3 and As+5. Comparative studies of PAN Fiber and iron ore adsorbents revealed that PAN fibers had better adsorption properties than iron ore for As+3 and As+5 in terms of percentage removal and capacity.

Dye-free coloration and flame retardancy of surface-modified polyacrylonitrile fibers

In this study, polyacrylonitrile (PAN) fibers were modified with triethylenetetramine (TETA) and subsequently treated with sodium hydroxide (NaOH). The influence of TETA and sodium hydroxide concentration, sodium hydroxide treatment temperature and time on the color and structure of the PAN fibers is discussed. It is shown that when treated with sodium hydroxide, the TETA-modified PAN fibers exhibit excellent flame retardancy and good colorfastness properties. Fourier transform infrared spectrometry analysis of the modified PAN fibers shows a gradual decrease in the characteristic –CN absorption peak at 2243 cm−1, while new absorption peaks for –C=N, –C–N and –NH2 functional groups appear at 1650, 1560 and 3600–3300 cm−1, respectively, confirming changes in the chemical structure of the fibers. In addition, the powder X-ray diffraction data show damage to the physical structure of the fibers in the form of decreased crystallinity and crystal completeness, while the scanning electron microscopy data indicate a significant increase in fiber diameter and surface roughness. These results demonstrate that enhanced flame retardancy and dye-free coloration of PAN fibers can be obtained by TETA and sodium hydroxide modification.

Modification of Polyacrylonitrile Fibers by Coupling to Thiosemicarbazones.

This work reports the modification of Polyacrylonitrile (PAN) fibers by coupling to thiosemicarbazones to achieve the biological activity for the applications in the food product packaging. After modification, seven thiosemicarbazone compounds were synthesized. The as-synthesized thiosemicarbazone compounds were bonded to PAN fibers via covalent coupling, which was confirmed using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy. The mean graft efficiency of the compounds was about 1.92%, and the antibacterial efficiency was 88.6% and 45.1% against Staphylococcus aureus (S-aureus) bacteria. All the seven thiosemicarbazone compounds exerted excellent tyrosinase activity, low cytotoxicity, excellent metal ion chelation ability, and anti-bacterial behavior against both gram-positive and negative bacteria. The mechanical properties of the fibers have been maintained without significant damage after the chemical modification. The break strength test and elongation at the break test were done to measure the fracture strength of the modified fibers. Overall, the promising properties of the modified PAN fibers show potential applications in food packaging materials for fruits and vegetables, which require long-term anti-browning effects during their transportation and storage.