Carbon Nanotubes-Adsorbed Electrospun PA66 Nanofiber Bundles with Improved Conductivity and Robust Flexibility

Guan, Xiaoyang; Zheng, Guoqiang; Dai, Kun; Liu, Chuntai; Yan, Xingru; Shen, Changyu; Guo, Zhanhu

doi:10.1021/acsami.6b02888

Cited by 248 publications

(116 citation statements)

References 52 publications

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“…Popular examples of such nanoproducts are electrospun nanofibers and electrosprayed nanoparticles [1–3]. In these electrohydrodynamic methods, electrostatic energy performs a dominant function in generation; however, other energies, such as thermal, radiant, and mechanical energies, can be combined into the process for an effective production [4–6].…”

Section: Introductionmentioning

confidence: 99%

Influence of Working Temperature on The Formation of Electrospun Polymer Nanofibers

Yang

et al. 2017

Nanoscale Res Lett

120

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Temperature is an important parameter during electrospinning, and virtually, all solution electrospinning processes are conducted at ambient temperature. Nanofiber diameters presumably decrease with the elevation of working fluid temperature. The present study investigated the influence of temperature variations on the formation of polymeric nanofibers during single-fluid electrospinning. The surface tension and viscosity of the fluid decreased with increasing working temperature, which led to the formation of high-quality nanofibers. However, the increase in temperature accelerated the evaporation of the solvent and thus terminated the drawing processes prematurely. A balance can be found between the positive and negative influences of temperature elevation. With polyacrylonitrile (PAN, with N,N-dimethylacetamide as the solvent) and polyvinylpyrrolidone (PVP, with ethanol as the solvent) as the polymeric models, relationships between the working temperature (T, K) and nanofiber diameter (D, nm) were established, with D = 12598.6 − 72.9T + 0.11T 2 (R = 0.9988) for PAN fibers and D = 107003.4 − 682.4T + 1.1T 2 (R = 0.9997) for PVP nanofibers. Given the fact that numerous polymers are sensitive to temperature and numerous functional ingredients exhibit temperature-dependent solubility, the present work serves as a valuable reference for creating novel functional nanoproducts by using the elevated temperature electrospinning process.

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Section: Introductionmentioning

confidence: 99%

Influence of Working Temperature on The Formation of Electrospun Polymer Nanofibers

Yang

et al. 2017

Nanoscale Res Lett

120

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“…The SEM and FTIR results indicated that the flame‐retardant mechanism of DPPM in RPUF was the forming of intact and continuous char layer on the surface of RPUF in thermal degradation of the composite, which prevented the heat and mass transfer between the gas and the condensed phases and effectively protected the substrate material from burning. These flame retardants can be extended for multifunctional polymer nanocomposites with an aim to broaden the applications of inert polymers especially in the form states in the fields such as electromagnetic interference shielding, energy storage and other sensing applications …”

Section: Discussionmentioning

confidence: 99%

Flame‐retardant rigid polyurethane foam with a phosphorus‐nitrogen single intumescent flame retardant

Wang

et al. 2017

Polymers for Advanced Techs

Self Cite

232

138

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A phosphorous-nitrogen intumescent flame-retardant, 2,2-diethyl-1,3-propanediol phosphoryl melamine (DPPM), was synthesized and characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance. Flame-retardant rigid polyurethane foams (RPUFs) with DPPM (DPPM-RPUF) as fire-retardant additive were prepared. Scanning electron microscope (SEM) and mechanical performance testing showed that DPPM exhibited a favorable compatibility with RPUF and negligibly negative influence on the mechanical properties of RPUF. The flame retardancy of DPPM on RPUF was investigated by the limiting oxygen index (LOI), vertical burning test and cone calorimeter. The LOI of DPPM-RPUF could reach 29.5%, and a UL-94 V-0 rating was achieved, when the content of DPPM was 25 php. Furthermore, the DPPM-RPUF exhibited an outstanding water resistance that it could still obtain a V-0 rating after water soaking. Thermogravimetric analysis showed that the residual weight of RPUF was relatively low, while the charring ability of DPPM-RPUF was improved greatly. Real-time Fourier transform infrared spectroscopy was employed to study the thermo-oxidative degradation reactions of DPPM-RPUF. The results revealed that the flame-retardancy mechanism of DPPM in RPUF was based on the surface charred layer acting as a physical barrier, which slowed down the decomposition of RPUF and prevented the heat and mass transfer between the gas and the condensed phases. storage and electromagnetic interference shielding fields due to its high mechanical properties, insulated properties, etc. 1-4 However, one of its major defects is its flammability, which limits its further applications. 5,6 The improvement of the flame retardancy of RPUF has currently been an important subject among the developments of new polymer foam materials. 7,8 Traditionally, the main flame retardants for RPUF are the halogen-based compounds such as pentabromodiphenyl ether, chloroethylphosphate, etc, which may endow RPUF excellent flame retardation. 9 However, when burning, such retardants release a lot of toxic gases which pollute environment and damage people's health. 10-14 Thus, the environmentally-friendly flame-retardant additives with good flame retardancy are particularly needed. In recent years, the phosphorus-nitrogen intumescent flame retardants (IFR) have been widely used as halogen-free additives because they provide excellent fire protection with less smoke and lower toxicity. 15,16 Traditional IFRs are mixtures, which usually consist of an acid source (eg, ammonium polyphosphate), a carbonizing agent (eg, pentaerythritol, sorbitol) and a foaming agent (eg, melamine). The IFRs system usually experiences an intense expansion and forms protective charred layers that serve as a physical barrier to protect the underlying material from flux or flame. 14,15 In spite of many advantages, IFRs have 2 issues, ie, low water solubility and high thermal stability. 17 In addition, they are poorly compatible with the RPUF matrix, which weakens the mechanical properties of ...

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“…[47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] The PAA adsorption strongly depended on the polymer size.…”

Section: Discussionmentioning

confidence: 99%

PAA/alumina composites prepared with different molecular weight polymers and utilized as support for nickel‐based catalyst

et al. 2017

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Mesoporous alumina, as a porous, high specific surface area, high activity, and heat stable material, has been widely used as an industrial adsorbent, catalyst, and catalyst support. The modification of alumina with organic polymers has been widely investigated in recent years. In this study, we compared the dependence of the adsorption of a polyelectrolyte, poly(acrylic acid) (PAA) on γ-alumina particles on polymer size via Fourier transform infrared spectroscopy, thermogravimetry, nitrogen adsorptiondesorption isotherm analysis, and atomic absorption spectrophotometry. We found that PAA with a hydrodynamic diameter greater than the alumina pore size would only adsorb on the outer surface of the oxides. For polymers with hydrodynamic diameters smaller than the alumina pore size, PAA infiltration resulted in a monolayer coverage of both the outer and inner surfaces of the oxide. Among the three PAA that could infiltrate the alumina pores, the one with the smallest molecular weight showed the highest adsorbed amount on alumina. The temperature, pH, concentration, and ionic strength of the PAA solutions were varied to illustrate the physicochemical differences of the prepared polymer/oxide composite materials. The high PAA-loaded composites were treated with a nickel ion solution, converted to Ni/alumina catalysts, and used in the methanation of carbon dioxide. The Ni/alumina catalysts were analyzed with X-ray diffraction and temperature-programmed reduction to illustrate the structural characteristics. The catalytic CO 2 methanation of the catalyst samples revealed that a solution pH value higher than pK a of PAA favored the formation of catalysts with high catalytic activity.

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Carbon Nanotubes-Adsorbed Electrospun PA66 Nanofiber Bundles with Improved Conductivity and Robust Flexibility

Cited by 248 publications

References 52 publications

Influence of Working Temperature on The Formation of Electrospun Polymer Nanofibers

Influence of Working Temperature on The Formation of Electrospun Polymer Nanofibers

Flame‐retardant rigid polyurethane foam with a phosphorus‐nitrogen single intumescent flame retardant

PAA/alumina composites prepared with different molecular weight polymers and utilized as support for nickel‐based catalyst

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