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Fibers and Polymers
Korean Fiber Society
Fibers and Polymers

Korean Fiber Society

1229-9197

Fibers and Polymers/Journal Fibers and PolymersEISCI
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    Facile Fabrication of Superhydrophobic Polymer Membranes with Hierarchical Structure for Efficient Oil/Water Separation

    Da-Seul KimJeongmin KangJae-Yeong Jung
    8页
    查看更多>>摘要：Superhydrophobic polymer membranes provide highly promising methods for efficient oil/water separation because of their cost effectiveness, and environmental friendliness. A variety of polymers have been widely used for the membrane fabrication, among which polyurethane acrylate (PUA) presents strong advantages of excellent mechanical strength with high deformability and chemical stability. In this study, we present a facile and rapid method for the fabrication of PUA-based superhydrophobic membranes with hierarchical structure, enabling efficient oil/water separation. For this work, PUA membranes with uniform pores were prepared via soft lithography, on which silica nanoparticles were deposited. The nanoparticles were preferentially functionalized with a silane coupling agent to lower the surface energy, and then spray-coated onto the PUA membrane supports to spontaneously form the hierarchical structure possessing superhydrophobic properties and excellent wettability to oil. Efficient oil/water separation was successfully demonstrated using a mixture of hexane and water with a separation efficiency of ～97 %, and the membranes could withstand a high pressure of ～2.0 kPa. We anticipate that these results will significantly contribute not only to the fabrication of superhydrophobic membranes with uniform pores but also the development of more diversified polymer-based membranes and separators leading to a wide range of applications.
      原文链接:
    • NSTL
    • Korean Fiber Soc

    Eco-friendly Synthesis of New Polyfunctional Azo Dyes Using Shrimp Chitin as a Catalyst: Application on Polyester Fabrics and Their Biological Activities

    Entesar A. HassanHamada M. MashalyZeinab M. Hashem
    11页
    查看更多>>摘要：A series of varying and poly-functionalized heterocyclic compounds 3a-c, 4d-k, 6a,b, 8, 9, and 12 containing azo function have been synthesized using 2-(1 -(4-aminophenyl)ethylidene)malononitrile (1) and/or its diazonium salt as building blocks. In addition, new pyridazine derivatives 4a-c, 7a,b, and 13a-f were synthesized. Subsequent treating of the resulted azo dyes moieties with different reagents in conventional and green conditions using microwave irradiation and shrimp chitin as a green catalyst; homo- and hetero-molecules containing azo dyes were gathered. The obtained azo dyes were applied on fabrics at high temperatures and their properties such as washing fastness using standard soap (SDS) and rubbing fastness (wet and dry) under controlled conditions of pressure, speed, and moisture were studied. In addition, they were screened for their biological activities on two bacterial and two mycolic species. The synthesized products were characterized by their elemental and spectral analyses such as IR, MS, ~1H-NMR, and ~(13)C-NMR spectra. The produced dyesruffs 3a-c, 4d, f, h, i, j, 6a,b, 8, and 12 were dyed on polyester fabrics, and subsequently their dyeing properties and their light, washing, perspiration, rubbing, and sublimation fastness was determined and the dyed samples showed very good fastness levels to rubbing, washing, thermal fixation, good light, and possessed very good perspiration fastness.
      原文链接:
    • NSTL
    • Korean Fiber Soc

    In Vitro Comparison Study of Plasma Treated Bilayer PGS/PCL and PGS/PLA Scaffolds for Vascular Tissue Engineering

    Parisa HeydariShokoh ParhamAnousheh Zargar Kharazi
    10页
    查看更多>>摘要：Biomaterial selection is one of the important factors in tissue engineering vascular graft (TEVG) because of its hemocompatibility, mechanical properties, and biodegradability. In the present research, we prepared the bilayer electrospun scaffolds from poly glycerol sebacate (PGS)/poly caprolactone (PCL) and poly glycerol sebacate (PGS)/poly lactic acid (PLA), Then the surface of both groups was modified by using oxygen plasma. Physical, mechanical and hemocompatibility evaluation of the bilayer PGS/PCL and PGS/PLA scaffold was performed to introduce a more suitable combination for TEVG applications. Results demonstrated that the plasma treatment process did not affect the surface morphology of electrospinning fibers but improved hydrophilicity, swelling ratio, and blood compatibility. It caused a faster degradation rate in treated groups. Mechanical tests of these scaffolds showed a proper mechanical strength for vascular tissue engineering before and after plasma treatment, however, elongation of the PGS/PCL scaffolds was more suitable for vascular graft applications. The hemocompatibility study showed improvement in platelet adhesion, hemolysis, and blood clotting time after plasma treatment in both groups also, there was no significant difference between the two scaffolds in hemocompatibility characteristics. It concluded that the treated bilayer PGS/PCL scaffold can be more suitable for vascular graft application.
      原文链接:
    • NSTL
    • Korean Fiber Soc

    In situ Shape-Stabilization of n-Octadecane PCM in Alginate Matrix through Formation of Emulsion and Solidification by Ionic Crosslinking

    Seung Han LeeHaneul ChaeNam Yoon Kim
    8页
    查看更多>>摘要：A novel in situ shape-stabilization process of paraffinic phase change material (PCM) in alginate matrix was investigated for the purpose of temperature regulating application. n-Octadecane was selected as a paraffinic PCM because of its adequate thermal transition temperature for applying to human body. As the size control of n-octadecane in polymer matrix less than 10 μm is a core factor for textile application, oil-in-water (O/W) emulsion of n-octadecane in water were adopted for the size control in shape-stabilization of PCM (SSPCM) in polymer matrix. The micelle size of the PCM emulsion could be controlled in the range of 3-8 μm through O/W emulsion process with high-speed stirring at 3,000-7,000 rpm and small amount of surfactant. The size of micelles in the emulsion decreased with increasing of homogenizing speed and the amount of surfactant. It was also confirmed that the PCM micelle size was maintained in alginate-PCM hybrid solution that was prepared by mixing the O/W emulsion and aqueous sodium alginate solution. The SSPCM films containing 10-30 wt% of n-octadecane in alginate could be successfully prepared by casting the hybrid solution followed by coagulating the cast film in aq. CaCl2 resulting solidification and insolubilization of alginate through intermolecular ionic crosslinking by Ca~(2+). It was interesting that the shape of n-octadecane in alginate matrix was not spherical but disk shape parallel to the film surface. It was presumed that the discus-type shape-stabilized form of n-octadecane in alginate matrix was originated by vertical compressive force applied during rapid coagulation of the hybrid solution having very low concentration of sodium alginate (4 wt%). The shape of paraffinic PCM stabilized in polymer matrix through O/W emulsion is expected to be controlled when the other polymeric system with thick concentration.
      原文链接:
    • NSTL
    • Korean Fiber Soc

    Biodegradation Control of Chitosan Materials by Surface Modification with Copolymers of Glycidyl Methacrylate and Alkyl Methacrylates

    Evgeny BryuzginEkaterina BryuzginaVitaliya Yartseva
    9页
    查看更多>>摘要：Chitosan is a promising polymer from natural polysaccharides, which is an environmentally friendly compound from renewable raw materials. Chitosan has biodegradability, biocompatibility, and antibacterial and other activities. In this article, we report the biodegradation control of chitosan materials by use of random copolymers based on glycidyl methacrylate and (fluoro)alkyl methacrylates as surface modifiers. We show that grafting of copolymers allows increasing the hydrophobicity of chitosan materials with initial contact angles up to 114 ° from 89 ° for films and up to 154 ° from 123 ° for aerogels. We demonstrate that modified aerogels retain contact angles of more than 150 ° for a long contact time with water while the initial aerogel fully wets for 30 s. The resulting chitosan aerogels have high porosity with a pore size of 100-200 μm, and the pore walls are 0.6-0.7-μm-thick film formations. Our study of lyophilic properties of modified chitosan substrates showed a change in the hydrophobicity of the materials as a function of length of the hydrocarbon radical in the side groups of the (fluoro)alkyl methacrylates in the copolymers. We demonstrate that the rate of biodegradation of the resulting materials decreases with an increase in the number of hydrophobic groups in the modifier. The obtained chitosan materials with hydrophobic coatings have potential as a protective layer for wound dressings with an extended service life.
      原文链接:
    • NSTL
    • Korean Fiber Soc

    A Hydrophilic/Hydrophobic Janus Membrane Used as Wound Dressings with Enhanced Antibacterial Properties

    Mengqi SongQian ZhaoXiuting Wang
    6页
    查看更多>>摘要：In this study, an asymmetric wettable composite wound dressing consists of hydrophobic polyvinylidene fluoride (PVDF) outer layer and a hydrophilic polydopamine (PDA) coated Ag nanoparticles (Ag NPs)/PVDF layer (PVDF-Ag-PDA) was successfully prepared through electrospinning and PDA coating. The results show that the contact angle of the PVDF surface is 132.8 °, while the PDA-coated surface is nearly 0 °, indicating an asymmetric wettability. The highly hydrophilic PVDF-Ag-PDA layer can significantly reduce bacterial growth, while the PVDF layer with a small pore size and high hydrophobicity can prevent bacterial adherence. In addition, cytotoxic assays showed that PVDF/PVDF-Ag-PDA present a high cell viability percentage (above 80 %), which is attributed to that the thin layer of PDA can alleviate the cytotoxicity of Ag NPs. Therefore, the Janus wound dressing noted as PVDF/PVDF-Ag-PDA has the potential for practical applications with the advantages mentioned above.
      原文链接:
    • NSTL

    Multielectrochromic Copolymers Based on Thiophene Derivatives: Tunable Optoelectronic Properties

    Yafei GuoYijie TaoGaoyong Liang
    9页
    查看更多>>摘要：In this study, a series of copolymers based on 3-methoxythiophene(MOT) and 3,4-ethylenedioxythiophene (EDOT) have been prepared by electrochemical method in boron trifluoride diethyl etherate (BFEE). The copolymers are characterized by FTIR, XPS, SEM and cyclic voltammograms. The MOT/EDOT ratio in the polymer chain decreases with the decreasing MOT/EDOT feed ratio, and low polymerization potential incorporates more EDOT units into the polymer chain. The electrochromic properties of the copolymers can be greatly tuned by the applied MOT/EDOT feed ratio. Absorption peak of the neutral copolymer presents red-shift with increasing feed ratio, and each copolymer has multicolor electrochromism. In addition, the copolymers present fast-switching response, reasonable coloration efficiency and good stability. All these indicate that the copolymers based on facile, commercial MOT and EDOT are promising candidates for electrochromic applications.
      原文链接:
    • NSTL
    • Korean Fiber Soc

    Synthesis and Characterization of the Temperature Controllable Shape Memory of Polycaprolactone/Poly(ethylene terephthalate) Copolyester

    Fu-Ting YangYu-Ming ChenSyang-Peng Rwei
    13页
    查看更多>>摘要：In this study, a series of novel controllable shape-memory polymers composed of poly(ethylene terephthalate) (PET) and poly(ε-caprolactone) (PCL) were synthesized using the one-pot method and were spun using the melt spinning process. The chemical structure and composition, thermal properties, crystallization properties, mechanical properties, and shape-memory behavior of these copolymers were characterized. The results revealed that the incorporation of a flexible PCL segment achieved random copolymers. The aliphatic PCL segment decreased the melting point, crystallinity, and glass transition temperature. The thermal stability of the synthesized PET-co-PCLs was higher than that of the blended polymers, and the decomposition temperature of PET-co-PCL-30 % reached 377.2 °C. The shape recovery ratio of PET-co-PCL-30 % was between 38.32 % and 82.69 % and was temperature dependent. The as-spun PET and PET-co-PCL fibers were melt spun at a winding rate of 1,000 m/min. The strength values of the fibers ranged from 2.16 to 1.2 gf/den depending on the increase in PCL content. Because of the biocompatibility of both PET and PCL and the shape-memory features of these copolyesters, PET-co-PCL fibers can be applied in intelligent textiles.
      原文链接:
    • NSTL
    • Korean Fiber Soc

    Surface Morphology and Biochemical Characteristics of Electrospun Cellulose Nanofibril Reinforced PLA/PBS Hollow Scaffold for Tissue Engineering

    Usman SaeedTuerdimaimaiti AbudulaHamad Al-Turaif
    10页
    查看更多>>摘要：The treatment of organ failure is one of the primary concerns of healthcare because available organ transplantation techniques have multiple disadvantages. Currently, tissue engineering has emerged as an ingenious approach in which biocompatible and biodegradable scaffolds are used as the alternative to allograft. The PLA/PBS solid electrospun scaffolds have gained a boosted interest in this field. However deficient nutrient diffusion in the implanted area, poor permeability of the seeded cells and insufficient vascularization has been postponing clinical translation of the electrospun scaffolds. In the present research, we have fabricated CNF/PLA/PBS hollow fibrous scaffolds using two different core templates such as mineral oil and glycerol. The physical properties and function were analyzed by using tensile test, scanning electron microscope, contact angle and invitro degradation. The quantity of attached protein was analyzed by using UV absorption and cell proliferation in the scaffold was determined by using MTT reagent kit. On the hollow fiber scaffold the size and distribution of pores affected the wettability. The oil template hollow fiber scaffold showed better cell integration and elevated cell multiplication rate than the glycerol patterned hollow fiber scaffold. Finally, the developed CNF reinforced PLA/PBS hollow fiber scaffold can be useful in tissue regeneration, repair, healing and can also function as wound dressing.
      原文链接:
    • NSTL
    • Korean Fiber Soc

    Fabrication of Functionally Graded Electrospun Membranes Based on Silk Fibroin for Using as Dental Barrier Membranes in Guided Bone Regeneration

    Samaneh GhafouriAli Reza Sadeghi-avalshahrAmir Mahdi Molavi
    8页
    查看更多>>摘要：The guided bone regeneration (GBR) technique has been extensively used to preserve or regenerate the alveolar ridge by a membrane. This work aimed to design a functionally graded membrane (FGM) based on Bombyx mori silk fibroin (SF) natural protein with excellent handling and flexibility using electrospinning technique. This FGM membrane consists of two practical layers, one layer for preventing gingival fibroblast ingrowth and the other for supporting osteogenic cell growth, used in the guided bone regeneration (GBR) technique. Both layers were fabricated through the electrospinning technique with different collector speeds (800 & 2000 rpm). Soaking in glycerol and mechanical cold pressing was utilized to mitigate the brittleness of electrospun mats and enhance their tensile strength, respectively. The biodegradation rate was studied in vitro through soaking in artificial saliva. The mechanical properties of fabricated samples were measured using a micro tensile test machine. In addition, the viability of cells was evaluated via MTT and cell attachment assays. A field emission scanning electron microscope (FESEM) was also utilized for morphological observations in different steps of production. The biodegradation rate showed negligible mass loss after 4 weeks. The maximum tensile strength of functionally graded membranes (FGM) was obtained around 9 MPa in dry state. Microstructural evaluation of samples revealed beadles structure and acceptable adhesion and growth of fibroblast cells on them. The viability of cells using MTT assay was revealed no cytotoxic effects. The results of different characterizations show promising potential of produced FGM samples for application as dental barrier membranes in guided bone regeneration.
      原文链接:
    • NSTL
    • Korean Fiber Soc