scholarly journals Electrical Properties of Silver-Attached Amine Functionalized Carbon Black/Polyethylene Terephthalate Fibers Prepared by Melt-Spinning

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1611 ◽  
Author(s):  
Choi ◽  
Ahn ◽  
Lee ◽  
Yeo
Keyword(s):  
Carbon Black ◽  
Polyethylene Terephthalate ◽  
Photoelectron Spectroscopy ◽  
Melt Spinning ◽  
Conductive Filler ◽  
Aminobenzoic Acid ◽  
X Ray ◽  
Amine Functionalized ◽  
Electron Microscopy Analysis ◽  
Conductive Fibers

In this study, amine functionalized carbon black (ABCB) was synthesized using 4-aminobenzoic acid in a phosphoric acid (PPA)/phosphorus pentoxide (P2O5) medium, and silver-attached carbon black (Ag-ABCB) was prepared by reducing AgNO3 with NaBH4 in the presence of ABCB in ethanol. Elemental, thermogravimetric, and Fourier transform-infrared analyses showed that carbon black (CB) had a well-functionalized 4-aminobenzoic acid. In addition, X-ray photoelectron spectroscopy and X-ray diffraction were used to examine the crystal structure of Ag nanoparticles. Conductive fibers were prepared by melt-spinning using ABCB, Ag-ABCB as a conductive filler, and polyethylene terephthalate (PET) as a polymer matrix. Results confirmed that the fiber that had Ag-ABCB as a conductive filler exhibited the best electrical conductivity. The dispersibility and morphology of the conductive filler in the PET matrix were confirmed through scanning electron microscopy analysis, and Ag-ABCB was the most uniformly dispersed filler in the PET matrix, with good structure.

Preparation and characterization of polyphenylene sulfide/graphene nanoplatelets composite fibers with enhanced oxidation resistance

2019 ◽  
Vol 32 (4) ◽  
pp. 394-405 ◽  
Author(s):  
Jian Xing ◽  
Zhenzhen Xu ◽  
Qing-Qing Ni ◽  
Huizhen Ke
Keyword(s):  
Oxidation Resistance ◽  
Photoelectron Spectroscopy ◽  
Melt Spinning ◽  
Retention Rate ◽  
Graphene Nanoplatelets ◽  
Polyphenylene Sulfide ◽  
Degree Of Crystallinity ◽  
Composite Fibers ◽  
Oxidation Treatment ◽  
X Ray

Composite masterbatches of polyphenylene sulfide (PPS) with functionalized graphene nanoplatelets (GNPs) were prepared by melt blending via a twin-screw extruder. The structure and morphology of composite masterbatches were characterized by scanning electron microscopy and X-ray diffraction analysis. The PPS/functionalized GNPs composite fibers were then manufactured by a self-made spinning equipment via melt spinning. The oxidation resistance and other properties of PPS composite fibers were also examined. The results showed that the pure PPS fibers exhibited smooth surface, whereas the surface of PPS/functionalized GNPs composite fibers was rough. The addition of functionalized GNPs could be acted as heterogeneous nucleating agents to improve the crystallization and increase the degree of crystallinity. The retention rate of breaking strength of PPS/functionalized GNPs composite fibers could maintain up to 85% after the oxidation treatment. The improvement in the oxidation resistance of PPS/functionalized GNPs composite fibers is the results of comprehensive effects characterized by the X-ray photoelectron spectroscopy analyses. The addition of functionalized GNPs could limit the damage of the C–S group and retard the generation of sulfuryl groups (–SO–) during the oxidation treatment. The chemical combination of the elements sulfur (S) and oxygen (O) could also be restricted, thus weakening the oxidation activity.

scholarly journals Properties of Conductive Polyacrylonitrile Fibers Prepared by Using Benzoxazine Modified Carbon Black

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 179 ◽  
Author(s):  
Damiro Ahn ◽  
Hyun-Jung Choi ◽  
Ho-dong Kim ◽  
Sang Young Yeo
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
Photoelectron Spectroscopy ◽  
Weight Ratio ◽  
Pan Fiber ◽  
Potential Applications ◽  
Conductive Fillers ◽  
Conductive Fibers ◽  
Surface Modified ◽  
Pan Fibers

Composites of carbon black (CB) and polymers are attractive for producing conductive fibers. Herein, to achieve improved interactions with polymers, the surface of CB was modified to form 4-aminobenzoyl-functionalized carbon black (ABCB), benzoxazine-functionalized carbon black (BZCB), and Ag-anchored carbon black (Ag-ABCB). The surface-modified CBs were characterized by Fourier transform infrared spectroscopy and thermogravimetric analysis, and X-ray photoelectron spectroscopy was utilized to confirm the presence of Ag in Ag-ABCB. Conductive polyacrylonitrile (PAN) fibers were wet-spun with conductive fillers (CB, ABCB, Ag-ABCB, and BZCB) to investigate the effects of various functional groups on the electrical and mechanical properties. After annealing the conductive PAN fibers, the conductivity and tensile strength greatly increased, whereas the diameter decreased. Notably, the fiber with a BZCB/PAN weight ratio of 12/88 possessed a conductivity of 8.9 × 10−4 S/cm, and strength of 110.4 MPa, and thus the highest conductivity and best mechanical properties in the conductive PAN fiber. These results indicate that the annealed BZCB/PAN fibers have potential applications in the manufacturing of antistatic fabrics.

scholarly journals Synthesis and Cytotoxicity of POSS Modified Single Walled Carbon Nanotubes

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Yuhua Xue ◽  
Hao Chen
Keyword(s):  
Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Single Walled Carbon Nanotubes ◽  
X Ray ◽  
Single Walled Carbon ◽  
Amine Functionalized ◽  
Low Toxicity ◽  
Organic Solutions ◽  
Oligomeric Silsesquioxane ◽  
Walled Carbon Nanotubes

Single walled carbon nanotubes (SWNTs) decorated with polyhedral oligomeric silsesquioxane (POSS) were synthesized via the amide linkages between the acid treated SWNTs and amine-functionalized POSS. The successful modification of SWNTs with POSS was confirmed by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and UV-Vis spectra. The resulting SWNTs-POSS can be dispersed in both water and organic solutions. The biocompatibility and cytotoxicity of the SWNTs and SWNTs-POSS were evaluated by CCK-8 viability assays, which indicated that SWNTs-POSS exhibit very extremely low toxicity. The low toxicity of the POSS modified SWNTs leads to more opportunities for using carbon nanotubes in biomedical fields.

scholarly journals Porphyrin–Nanodiamond Hybrid Materials—Active, Stable and Reusable Cyclohexene Oxidation Catalysts

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1402
Author(s):  
Lucas D. Dias ◽  
Fábio M. S. Rodrigues ◽  
Mário J. F. Calvete ◽  
Sónia A. C. Carabineiro ◽  
Marisa D. Scherer ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Allylic Oxidation ◽  
Reusable Catalyst ◽  
Turnover Number ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Amine Functionalized ◽  
Major Loss ◽  
Covalently Linked ◽  
Catalytic Cycles

The quest for active, yet “green” non-toxic catalysts is a continuous challenge. In this work, covalently linked hybrid porphyrin–nanodiamonds were prepared via ipso nitro substitution reaction and characterized by X-ray photoelectron spectroscopy (XPS), fluorescence spectroscopy, infrared spectroscopy (IR) and thermogravimetry-differential scanning calorimetry (TG-DSC). The amine-functionalized nanodiamonds (ND@NH2) and 2-nitro-5,10,15,20-tetra(4-trifluoromethylphenyl)porphyrin covalently linked to nanodiamonds (ND@βNH-TPPpCF3) were tested using Allium cepa as a plant model, and showed neither phytotoxicity nor cytotoxicity. The hybrid nanodiamond–copper(II)–porphyrin material ND@βNH-TPPpCF3-Cu(II) was also evaluated as a reusable catalyst in cyclohexene allylic oxidation, and displayed a remarkable turnover number (TON) value of ≈265,000, using O2 as green oxidant, in the total absence of sacrificial additives, which is the highest activity ever reported for said allylic oxidation. Additionally, ND@βNH-TPPpCF3-Cu(II) could be easily separated from the reaction mixture by centrifugation, and reused in three consecutive catalytic cycles without major loss of activity.

Study on the Gas Sensitivity of a CeO2 Based Ceramic Sensing Element: Structure and Characteristic

2007 ◽  
Vol 280-283 ◽  
pp. 305-310
Author(s):  
Tao Yan ◽  
Xiao Lin Liu ◽  
Jian Feng Chen
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Sensing Element ◽  
Gas Sensitivity ◽  
X Ray ◽  
Sensing Properties ◽  
Surface Areas ◽  
Electron Microscopy Analysis

The sensitivity of CuO dispersed on fluorite-type oxide, namely CeO2 was studied in this work. Mixed oxide sample of nanostructured CuxCe1-xO2-y of various composition were generated by step chemical precipitation method. Distinct copper species were identified as a function of copper content by X-ray photoelectron spectroscopy, X-ray powder diffraction, the special surface areas, transmission electron microscopy, scanning electron microscopy analysis, and sensing properties to CO. It was found that only small amounts of copper are sufficient to promote the sensitivity of CeO2 by several orders of magnitude, which excessive amounts of copper (Cu/(Cu+Ce)>0.12) are detrimental to the sensing properties of nanocompositions. The possible causes for this behavior are also discussed.

scholarly journals Synthesis of Amine Functionalized Mesoporous Silicas Templated by Castor Oil for Transesterification

MRS Advances ◽  
2018 ◽  
Vol 3 (38) ◽  
pp. 2261-2269 ◽  
Author(s):  
Elianaso Elimbinzi ◽  
Stephen S. Nyandoro ◽  
Egid B. Mubofu ◽  
Amin Osatiashtiani ◽  
Jinesh C. Manayil ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Castor Oil ◽  
Sol Gel ◽  
Colloidal Dispersions ◽  
Mesoporous Silicas ◽  
X Ray ◽  
Type Iv ◽  
Amine Functionalized ◽  
Surface Basicity ◽  
Diffuse Reflectance Infrared

ABSTRACTMesoporous silicas were synthesized via a surfactant-templated sol-gel route using castor oil as the templating agent under acidic medium. The resulting silicas were subsequently amine functionalized with 3-aminopropyltriethoxysilane (NH2-MTS), [3-(2-aminoethylamino)-propyl]trimethoxysilane (NN-MTS), and [3-(diethylamino)propyl]trimethoxysilane(DN-MTS) to introduce surface basicity. Surface physicochemical properties were characterized by field emission gun scanning electron microscopy (FEGSEM), nitrogen porosimetry, X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and diffuse reflectance infrared fourier transform spectroscopy (DRIFTS). As-synthesised materials exhibit type IV adsorption-desorption isotherms characteristic of mesoporous structures. Clusters of spherical shaped materials were observed by FEGSEM, suggesting growth of silica occurs within colloidal dispersions. High-resolution N 1s XP spectra and DRIFT spectra confirmed the presence of amine groups in the organo-amine functionalised mesoporous silicas. The amine functionalised mesoporous silicas were active for the transesterification of tributyrin with methanol, with conversion found to increase from NH2-MTS< NN-MTS< DN-MTS.

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