Synthesis and Characterization of Aromatic Poly(azomethine ether)s with Different meta- and para-Phenylene Linkage Contents

Choi, Young Chul; Kim, Min Su; Ryu, Kyoung Moon; Lee, Sang Hoon; Jeong, Young Gyu

doi:10.1007/s12221-020-9690-5

Cited by 9 publications

(8 citation statements)

References 15 publications

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“…Among the untreated star SBR/CB, star SBR/Silica, and star SBR/Silica/Silane compounds, star SBR/Silica/Silane compound has the highest bound rubber content, followed by star SBR/CB and star SBR/Silica compound. The higher bound rubber content of star SBR/Silica/Silane compound compared with star SBR/CB compound can be attributed to a slight silanization during mixing and preparation of star SBR/Silica/Silane compound . Both the chemical reaction and improved rubber–filler interaction with silane resulted in a higher bound rubber content of star SBR/Silica/Silane compared with that of star SBR/Silica compound.…”

Section: Resultsmentioning

confidence: 98%

“…The higher bound rubber content of star SBR/Silica/Silane compound compared with star SBR/CB compound can be attributed to a slight silanization during mixing and preparation of star SBR/Silica/Silane compound. 3,35 Both the chemical reaction and improved rubber-filler interaction with silane resulted in a higher bound rubber content of star SBR/Silica/Silane compared with that of star SBR/Silica compound. Without silane, the rubber-filler interaction in the star SBR/Silica compound is very poor, leading to the lower bound rubber content of star SBR/Silica compound.…”

Section: Bound Rubber Contentmentioning

confidence: 99%

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Effect of ultrasonic extrusion of star styrene‐butadiene rubber on properties of carbon black‐ and silica‐filled compounds and vulcanizates

Liang

Isayev

2019

J of Applied Polymer Sci

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Extrusion of star styrene‐butadiene rubber (SBR) without and with ultrasonic treatment at amplitudes 3.5, 5, 7.5, and 10 μm was carried out. The molecular structure of untreated and treated star SBR was determined. Significant reduction of die pressure was observed during ultrasonic treatment due to the thixotropic and degradation effects. Ultrasonic treatment of star SBR at 3.5 μm created molecules of higher molecular weight via long‐chain branching without gel formation. Ultrasonic treatment of star SBR at 5 μm created a small amount of gel. At high ultrasonic amplitudes more gel was generated hindering mixing of star SBR with silica. Extruded star SBR was compounded with carbon black and precipitated silica, with and without silane. It was found that the long‐chain branching induced by ultrasonic treatment improved the rubber–filler interaction in precipitated silica without silane, as confirmed by the increase of bound rubber content. The filler–filler interaction was reduced in silica compounds without silane, as indicated by study of Payne effect. The significantly improved rubber–filler interaction and reduced filler–filler interaction led to an increase of the modulus at 100% elongation and tensile strength of SBR/silica vulcanizates. Extensive comparisons were made with earlier study on ultrasonic treatment of linear SBR. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47451.

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Section: Resultsmentioning

confidence: 98%

Section: Bound Rubber Contentmentioning

confidence: 99%

Effect of ultrasonic extrusion of star styrene‐butadiene rubber on properties of carbon black‐ and silica‐filled compounds and vulcanizates

Liang

Isayev

2019

J of Applied Polymer Sci

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“…The solution polymerization of PAME was carried out in the same procedure reported in the previous article 27 . PAME‐derived CNFs were fabricated via a two‐step process of the electrospinning of PAME/PVP solution and following carbonization of as‐spun PAME/PVP nanofibers, as shown schematically in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Poly(azomethine ether)‐derived carbon nanofibers for self‐standing and binder‐free supercapacitor electrode material applications

Choi

Kim

Ryu

et al. 2020

Polymers for Advanced Techs

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We report the microstructure and electrochemical performance of poly(azomethine ether) (PAME)-derived carbon nanofibers (CNFs), which were fabricated by a facile two-step process of electrospinning and carbonization, as self-standing and binderfree supercapacitor electrode materials. The SEM images showed that the average diameter decreased noticeably from $293.9 nm of as-spun nanofibers to $150.3 nm of CNFs after the carbonization at 1000 C. The EDS, XPS, Raman, and XRD analyses demonstrated that PAME-derived CNFs have a nitrogen self-doped graphitic structure. Accordingly, PAME-derived CNFs were characterized to have relatively high electrical conductivity of $3.1 S/cm and excellent wettability to water. The cyclic voltammetry and galvanostatic charge/discharge tests revealed that PAME-derived CNFs have a high specific capacitance of 298 F/g at 0.3 A/g, energy density of 3.3 to 13.9 Wh/kg, power density of 37.5 to 250.0 W/kg, and capacity retention of $94% after 1000 cycles.

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“…The order of the calculated Stokes shifts of the compounds for the visible region was CIP < DIP < PDIP < PCIP (Table 3). The smaller Stokes shifts of diphenol Schiff bases (CIP and DIP) indicate their lower vibrational relaxation and higher rigidity of the molecules due to strong intermolecular packing [35]. The larger Stoke shifts of poly(azomethineester)s (PDIP and PCIP) showed their less rigidity or more flexibility as compared to their corresponding Schiff bases due to the presence of ester linkages.…”

Section: Fluorescence Spectroscopymentioning

confidence: 99%

Synthesis and characterization of new thermally stable, antimicrobial and red-light-emitting poly(azomethine-ester)s

et al. 2020

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Two new diphenol Schiff base monomers were prepared through condensation reaction between 4-hydroxybenzaldehyde and 4,4′-diaminodiphenyl sulfone (dapsone) or 1,2-cyclohexanediamine. The resulting Schiff bases were reacted with terephthaloyl dichloride through polycondensation and formed two novel poly(azomethine-ester) s. The molecular masses of diphenol Schiff bases were determined through E.I mass spectroscopy. The elemental composition of poly(azomethine-ester)s was evaluated through CHN analysis. The structures of diphenol Schiff bases and poly(azomethineester)s were confirmed though FT-IR, 1 HNMR, UV-Vis spectroscopy, fluorescence, SEM and thermal analysis (TG/DTA). All the synthesized compounds were fluorescent and indicated 2-4 emission bands with maximum emission intensities within 342-682 nm at different excitation wavelengths. The diphenol Schiff bases showed violet-light emission, while their derived polyesters showed red-light emission. The poly(azomethine-ester)s indicated good thermal stability (347 °C and 561 °C) which was estimated through T max (temperature at which rate of weight loss is maximum) value obtained from DTG (derivative thermogravimetry) graph. The synthesized compounds were also tested for their antimicrobial activities against different species of bacteria and fungi. The Schiff base having dapsone moiety showed 55% inhibition, while its derived poly(azomethine-ester) showed 40% inhibition against bacterial species Shigella flexneri.

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Synthesis and Characterization of Aromatic Poly(azomethine ether)s with Different meta- and para-Phenylene Linkage Contents

Cited by 9 publications

References 15 publications

Effect of ultrasonic extrusion of star styrene‐butadiene rubber on properties of carbon black‐ and silica‐filled compounds and vulcanizates

Effect of ultrasonic extrusion of star styrene‐butadiene rubber on properties of carbon black‐ and silica‐filled compounds and vulcanizates

Poly(azomethine ether)‐derived carbon nanofibers for self‐standing and binder‐free supercapacitor electrode material applications

Synthesis and characterization of new thermally stable, antimicrobial and red-light-emitting poly(azomethine-ester)s

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