Electrospun poly(2‐aminothiazole)/cellulose acetate fiber membrane for removing Hg(II) from water

Yang

et al. 2020

Polymers

Self Cite

Electrospinning, as a promising platform in multidisciplinary engineering over the past two decades, has overcome major challenges and has achieved remarkable breakthroughs in a wide variety of fields such as energy, environmental, and pharmaceutics. However, as a facile and cost-effective approach, its capability of creating nanofibers is still strongly limited by the numbers of treatable fluids. Most recently, more and more efforts have been spent on the treatments of liquids without electrospinnability using multifluid working processes. These unspinnable liquids, although have no electrospinnability themselves, can be converted into nanofibers when they are electrospun with an electrospinnable fluid. Among all sorts of multifluid electrospinning methods, coaxial electrospinning is the most fundamental one. In this review, the principle of modified coaxial electrospinning, in which unspinnable liquids are explored as the sheath working fluids, is introduced. Meanwhile, several typical examples are summarized, in which electrospun nanofibers aimed for the environment remediation were prepared using the modified coaxial electrospinning. Based on the exploration of unspinnable liquids, the present review opens a way for generating complex functional nanostructures from other kinds of multifluid electrospinning methods.

Section: Pure Solvent As a Sheath Fluid To Create Oligomer-loaded Funmentioning

confidence: 99%

“…Both (a) and (b) are representative TEM images of 0.1 g PAT/1.44 g CA nanofibers with unexpected core-shell nanostructures. Reprinted with permission from[50].…”

mentioning

confidence: 99%

Electrospun Environment Remediation Nanofibers Using Unspinnable Liquids as the Sheath Fluids: A Review

Yang

et al. 2020

Polymers

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“…It is shown that the adsorption capacity (440.25 mg/g at 25 • C) obtained with PAT-PS particles in this work was much higher than that of many other adsorbents reported in literature. For example, the maximum adsorption capacity of a PAT/CA fiber membrane was only 177 mg/g at 25 • C [15]. The excellent adsorption properties of the PAT-PS particles for Hg(II) should be primarily ascribed to their having a high surface area available for adsorption.…”

Section: Adsorption Properties Of the Pat-ps Particlesmentioning

confidence: 99%

“…As far as we are aware, this is the first work on the synthesis of PAT in the form of conjugated polymer-coated latexes, and the adsorption properties of the PAT-coated PS composite particles, which exhibit relatively high adsorption capacity, are reported for the first time. Poly(2-aminothiazole) (PAT) is a relatively new heterocyclic conjugated polymer that can be polymerized from 2-aminothiazole (AT) by the chemical oxidative method with various oxidant/solvent systems [9][10][11][12][13][14][15][16][17]. Recently, we reported the preparation of PAT by the chemical oxidative method using copper chloride as an oxidant in aqueous solution without adding any acid [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Poly(2-aminothiazole)-Coated Polystyrene Particles and Their Excellent Hg(II) Adsorption Properties

Zou

2020

Polymers

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Synthesis of conjugated polymer-coated latex particles is an effective method to improve the poor processability of conjugated polyheterocycles. The key to success is to control the overlayer thickness so it is less than the size of the solvated layer of polymeric stabilizer. This paper presents a protocol to coat polymer latex particles with poly(2-aminothiazole) (PAT), which is a relatively new heterocyclic conjugated polymer. The protocol is based on chemical oxidative polymerizations of 2-aminothiazole using copper chloride as the oxidant at a fixed oxidant/monomer molar ratio of 0.5 in aqueous media in the presence of poly(N-vinyl-2-pyrrolidone)-functionalized polystyrene (PS) latex. The effects of monomer concentration, PS concentration, and polymerization temperature on the morphology of the PAT-coated PS composite particles were investigated by SEM and TEM, and the resulting composite particles characterized by FTIR and XPS. Optimization of the initial monomer concentration allowed colloidally stable PAT-coated PS composite particles to be formed at ambient temperature, and the PAT loading was easily adjusted by varying the initial PS concentration. The Hg(II) adsorption properties of selected PAT-coated PS composite particles were assessed preliminarily. The maximum adsorption capacity at 25 °C reached 440.25 mg/g, which is much higher than many other adsorbents.

“…Compared to conventional electrospinning, coaxial electrospinning, which adopts a spinneret composed of two coaxial capillaries to simultaneously deliver two different solutions to form the fibers with desired structure, has attracted more and more interests in fabricating bicomponent fibers . Due to the advantage of combining the properties of the core and sheath materials, the composite fibers are promising for a variety of applications, such as multifunctional textiles, drug encapsulation and release, sensitive biochemical sensors, scaffolds for tissue engineering, and conductive materials . Special morphology and structures, such as a continuous core–shell structure, hollow structure, discontinuous core–shell structure, blend‐like morphology, and so on, can be obtained by coaxial electrospinning via controlling the preparation conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing‐induced interfacial demixing on crystallization of PEO confined in coaxial electrospun nanofibers

Zou

Guo

J of Applied Polymer Sci

et al. 2017

Glassy polymer nanofibers with spatially confined poly(ethylene oxide) (PEO) were fabricated by coaxial electrospinning of PEO with polyacrylonitrile (PAN) or polystyrene. The effect of melt-annealing on the crystallization behavior of the confined PEOs was studied using differential scanning calorimetry. It is found that the crystallization behavior of the confined PEOs varies with annealing temperature (T a ), annealing time (t a ), and molecular weight of PEO. Notably, it is observed that the crystallization temperature (T c ) and melting temperature (T m ) of PEO increase with prolongation of t a , for PEO600K/PAN and PEO2K/PAN coaxial electrospun fibers. This phenomenon can be interpreted by the annealing-induced demixing at the core-sheath interface. After the coaxial electrospinning, the core and sheath of the PEO/PAN coaxial fibers are partially compatible due to the miscible solvents used for the core and sheath polymers. Upon annealing, demixing occurs at the core-sheath interface, leading to improved crystallizability of PEO.In the present work, coaxial electrospun fibers with poly(ethylene oxide) (PEO) confined within the glassy polyacrylonitrile (PAN) or polystyrene (PS) sheath were fabricated using different Additional Supporting Information may be found in the online version of this article.