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Wu Q.,University of Science and Technology of China | Wu Q.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Yang Z.,University of Science and Technology of China | Yang Z.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | And 3 more authors.
High Performance Polymers | Year: 2016

Five new optically active poly(amide-imide)s (PAIs) (PAI3a-PAI3e) were synthesized through the direct polycondensation reaction between chiral N,N′-(pyromellitoyl)-bis-l-amino acids and 4,4′-diaminodiphenyl ether. The resulted polymers were fully characterized by means of Fourier transform infrared (FTIR) and proton nuclear magnetic resonance spectroscopy, elemental analysis, inherent viscosity measurement, solubility tests, specific rotation, and thermogravimetric analysis (TGA). The biodegradation studies of the PAIs were performed in soil and in phosphate buffer solution. The surface morphology and hydrophobicity of the biodegraded PAI films were investigated. FTIR spectra showed structural changes on PAI powders being treated in phosphate buffer solution. The TGA data showed that the thermal stability of PAI powders decreased with the degradation time. The collected degradation products were soluble in water and had absorption in ultraviolet and visible light region. Possible biodegradation mechanism of amino acid-based PAIs was explored. © The Author(s) 2015.


Feng J.,University of Science and Technology of China | Feng J.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | He F.,University of Science and Technology of China | He F.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | And 4 more authors.
Polymer Degradation and Stability | Year: 2016

The l-alanine, glycine and 4-aminobutyric acid, respectively representing the natural chiral amino acids, the natural achiral amino acids and non-natural achiral amino acids, were combined into three types of diacid monomers containing the imide groups. The resulting diacid monomers and the diaminodiphenyl ether were combined into the glycine-based homopolymerized polyamide-imide (PAI) via the direct polycondensation method, as well as four randomly copolymerized PAI's. The biodegradability of these polymers has been studied in a systemic manner with the soil burial experiments and the appearance, molecular weights and structure of the polymers before and after the degradation have been characterized with the scanning electron microscopy, gel permeation chromatography and Fourier transform infrared spectroscopy. The research outcomes suggested that the glycine-based PAI has certain biodegradability. For the copolymerized PAI combined with the glycine and l-alanine fragments, the higher the l-alanine fragment content is, the faster the biodegradation rate becomes. However, for the copolymerized PAI based on glycine and 4-aminobutyric acid, the higher the 4-aminobutyric acid structural units, the slower the biodegradation rate becomes. It can be concluded that the copolymerization with l-alaine enhanced the biodegradation instead of using glycine or 4-aminobutyric acid. © 2016 Elsevier Ltd. All rights reserved.


Zhang Y.,Shandong University of Technology | Li M.,Shandong University of Technology | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li M.,University of Jinan | And 6 more authors.
Journal of Solid State Electrochemistry | Year: 2014

The layered polypyrrole-graphene oxide-sodium dodecylbenzene sulfonate (PPyGO-SDBS) nanocomposites were facilely fabricated via an in situ emulsion polymerization method with the assistance of SDBS as dopant and stabilizer. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and electrochemical performance were employed to analyze the structure and the characteristics of the composites. The results showed that SDBS played an important role in improving the electrochemical performance of the PPyGO-SDBS, by dispersing the PPy between the layers of the GO. The obtained PPyGO-SDBS exhibited remarkable performance as an electrode material for supercapacitors, with a specific capacitance as high as 483 F g-1 at a current density of 0.2 A g-1 when the mass ratio of pyrrole to GO was 80:20. The attenuation of the specific capacitance was less than 20 % after 1,000 charge-discharge processes, supporting the idea that PPy inserted successfully into the GO interlayers. The excellent electrochemical performance seemed to arise from the synergistic effect between the PPy and the GO and the dispersion of the PPy induced by SDBS. © 2014 Springer-Verlag Berlin Heidelberg.


Li M.,Shandong Polytechnic University | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li W.,Shandong Polytechnic University | Liu J.,Shandong Polytechnic University | And 2 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2013

PPy nanotubes were succesfully synthsized in neutral MO aqueous solutions by in situ polymerization using FeCl3 or APS as oxidant respectively. These nanotubes were characterized with SEM, TEM, FTIR XRD and EDS and results showed MO molecules entered into the PPy chain as dopant. The good conducting characteristic may be related to the higher doping level of the MO and conductivity of the PPy nanotubes was up to 29.07 S·cm-1. The shape of the obtained PPy would be changed slightly and its solubility was greatly improved because of the addition of HCl in neutral MO aqueous solutions. © 2012 Springer Science+Business Media, LLC.


Yang L.,University of Science and Technology of China | Li M.,University of Science and Technology of China | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li M.,University of Jinan | And 8 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2014

Novel polypyrrole nanotubes/multi-walled carbon nanotubes (PPyNTs/MWCNTs) composites have been successfully synthesized via in situ chemical oxidation polymerization with methyl orange as soft template. Scanning electron microscopy and transmission electron microscopy images revealed that MWCNTs intertwined with the PPyNTs and PPyNTs/MWCNTs composites formed in water-ethanol solution. The obtained composites exhibited perfect electrochemical characteristic compared with PPyNTs and MWCNTs owing to the synergetic effect and the specific capacitance of the composites was strongly influenced by the mass ratio of pyrrole to MWCNTs. According to the galvanostatic charge/discharge analysis, the specific capacitance of PPyNTs/MWCNTs composites is up to 352 F g-1 at a current density of 0.2 A g-1 in 1 M KCl solution, much higher than that of the PPyNTs (178 F g-1) and MWCNT (46 F g-1), suggesting its potential application in supercapacitors. © 2013 Springer Science+Business Media New York.


Zhao G.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Liu S.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Lu Q.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Xu F.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | And 2 more authors.
Journal of Sol-Gel Science and Technology | Year: 2013

TiO2/Bi2WO6 composite nanofibers have been successfully synthesized by a simple electrospinning process. XRD, SEM, HR-TEM, nitrogen adsorption-desorption isotherms and UV-visible diffuse reflectance spectra were used to characterize the composite nanofibers. The composite fibers with diameters about 100 nm was composed of nanoparticles and possessed of high specific surface area (49.6 m2 g-1) and porous structure. Besides, the TiO2/Bi2WO6 composite nanofibers exhibited excellent visible photocatalytic property in the photodegradation of methylene blue (MB), and over 97.2 % of MB was degraded within 5.5 h. © 2013 Springer Science+Business Media New York.


Li M.,Shandong Polytechnic University | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li W.,Shandong Polytechnic University | Liu J.,Shandong Polytechnic University | And 2 more authors.
Polymer Engineering and Science | Year: 2013

Polypyrrole (PPy) was successfully prepared by chemical oxidation in various anionic surfactant solvents and an interesting regulation of the molar ratio of the oxidant and the monomer was firstly discovered which was closely related to the conductivity of the PPy when the molar ratio of the anionic surfactant to the monomer was 0.3. The value of conductivity reached its maximum when the molar ratio of the oxidant and the monomer was 1.1. A series of testing results including scanning electron microscopy, elemental analysis, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Four-Point Probes Resistivity Measurement System showed that the morphology and conducting characteristic of obtained PPy were greatly influenced by the anionic surfactant. The doping level and the degree of the structural order of counterions in the polymer chains influence the conductivity of the obtained doped PPy. © 2013 Society of Plastics Engineers.


Li M.,University of Science and Technology of China | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li M.,University of Jinan | Zhang Y.,University of Science and Technology of China | And 7 more authors.
Electrochimica Acta | Year: 2015

Hollow melamine resin-based carbon spheres (HMCS) clad in graphene (GN) sheets brought an unique three-dimensional (3D) network architecture after the pyrolysis of the melamine-formaldehyde (MF) resin spheres/graphene oxide composite under argon. Polyvinyl alcohol plays an important role in controlling the size and the structure of the MF resin spheres and can induce the formation of hollow nitrogen-containing carbon spheres to produce the HMCS/GN composite after anneal treatment. The diameter of the HMCS can be tuned by changing the carbonization temperature. The HMCS/GN annealed at 600 °C exhibits excellent electrochemical performance making it an ideal electrode material for supercapacitors. High specific capacitance of 720 F g-1 at a current density of 0.2 A g-1, 560 F g-1 at 5 A g-1 and 420 F g-1 at 20 A g-1 can be achieved which indicates ideal rate capability. The specific capacitance retains 80.3% after 10000 charge-discharge processes at a current density of 20 A g-1. The excellent electrochemical performance of the HMCS/GN is ascribed to its unique 3D network architecture constructed by the hollow carbon spheres intercalated in GN sheets and the high nitrogen content of the composite. © 2015 Elsevier Ltd. All rights reserved.


Chang X.,Shandong University of Technology | Li M.,Shandong University of Technology | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li M.,University of Jinan | And 4 more authors.
RSC Advances | Year: 2016

A novel adsorbent of phenol-formaldehyde resin (PF) microspheres was prepared at a low temperature, and had an excellent performance for the adsorption-reduction of Cr(vi). The microspheres were characterized by transmission electron microscope (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS). The effects of contact time, pH value and initial concentration, adsorbent dosage and temperature were studied by batch mode. The results showed that the adsorption process fitted a pseudo-second-order model and a Langmuir isotherm model very well, and an intra-particle diffusion model gave three stages in the whole process. Thermodynamic constant values (ΔH° > 0, ΔS° > 0, ΔG° < 0) indicated that the adsorption process was endothermic and spontaneous. The maximum adsorption capacity of Cr(vi) on the adsorbent reached 280.9 mg g-1 at 303 K. The PF microspheres could be applied to Cr(vi)-water treatment with the reduction and adsorption of the heavy metal ion. © The Royal Society of Chemistry 2016.


Li M.,University of Science and Technology of China | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li M.,University of Jinan | Yang L.,University of Science and Technology of China | Zhang Y.,University of Science and Technology of China
RSC Advances | Year: 2015

A hollow thorn-like polypyrrole (PPy) microtube structure (HTPMT) has been prepared by in situ chemical oxidation polymerization using Methyl Orange (MO) and sodium dodecylbenzene sulfonate (SDBS) as double soft templates, in which the MO and SDBS performed both as surfactant and dopant. The hierarchical structure of HTPMT formed in the presence of MO and SDBS was different from that of polypyrrole microtubes (PMT) or nanoparticles (PNP) using MO and SDBS separately. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that the morphology of the HTPMT had the appearance of thorns growing on the surface of the PMT. The TEM images of the MO and SDBS solutions revealed that PPy had polymerized on the surface of the end-closed MO tubes and in the vesicular SDBS micelles. Electrostatic attraction between the anionic SDBS micelles and cationic pyrrole radicals during the polymerization assisted the formation of the HTPMT. The HTPMT exhibited improved electrochemical performance and thermal stability compared with PMT or PNP, illustrating that the morphology and structure of the conductive polymer influenced the electrochemical performance of the electrode materials. This journal is © The Royal Society of Chemistry 2015.

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