Key Laboratory for Green Chemical Process of Ministry of Education

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Key Laboratory for Green Chemical Process of Ministry of Education

Laboratory for, China
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Yang F.,Key Laboratory for Green Chemical Process of Ministry of Education | Zhang M.,Key Laboratory for Green Chemical Process of Ministry of Education | Yang H.,Key Laboratory for Green Chemical Process of Ministry of Education | Yan W.,Philips | Jiang F.,Philips
Journal of Applied Polymer Science | Year: 2017

In this article, four kinds of konjac glucomannan based superabsorbent polymers (KSAPs) with different aggregate sizes were obtained by sieving the KSAP powders manually. They were characterized by scanning electronic microscopy (SEM), Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), and optical contact angle (OCA), and the effects of aggregate size on liquid absorption characteristics of KSAP were studied in detail. The results show that the coarse KSAP particles were aggregated by many microspheres, while the fine particles were well dispersed with 50-150 μm particle size. OCA dynamic images showed the enhanced hydrophilicity for the finer particles. The liquid absorption measurements demonstrated that water and physiological saline absorption velocity of KSAP increased for the finer particles, while their ultimate water holding capacity decreased accordingly. The liquid absorption capacity of the finest sample (75-μm) could reach its maximum value (332.5±5.6 g/g) in 0.5 min, while the coarsest sample (850-μm) reached the maximum value (532.5±1.2 g/g) in 16 min. The reason for this phenomenon was discussed, and a new model was proposed to explain it. We believe that the results of this article would be meaningful in application of KSAP as superabsorbent materials. © 2017 Wiley Periodicals, Inc.


Liu Y.,Key Laboratory for Green Chemical Process of Ministry of Education | Xiong H.,Key Laboratory for Green Chemical Process of Ministry of Education | Yu X.,Key Laboratory for Green Chemical Process of Ministry of Education | Huang H.,Key Laboratory for Green Chemical Process of Ministry of Education | And 2 more authors.
Polymer Composites | Year: 2017

The hierarchical polypyrrole/sulfonated reduced graphene oxide nanocomposites were synthesized via water/organic liquid interfacial fabrication. Sulfonated reduced graphene oxide with negative charges acted as the dopant of polypyrrole during the process of interfacial fabrication, which efficiently prompted the incorporation of sulfonated reduced graphene oxide in the polypyrrole matrix through the interfacial interaction between polypyrrole and sulfonated reduced graphene oxide. The effect of organic liquid on the microstructure and supercapacitive performance of the nanocomposites was investigated. In the case of hexane as the organic liquid, a high specific capacity of 265.6 F g-1 at a current density of 1 A g-1 was obtained from the polypyrrole/sulfonated reduced graphene oxide nanocomposite, and about 90% of the initial capacity was retained after 1,000 cycles. The improved electrochemical capacitance of the nanocomposite was ascribed to the combinative properties of good electrical conductivities of two components and the unique structure with increased specific surface area. These nanocomposites could be promising electrode materials for high-performance electrochemical capacitors. © 2017 Society of Plastics Engineers.


Zhao X.,Key Laboratory for Green Chemical Process of Ministry of Education
Journal of Food Biochemistry | Year: 2016

Protein and its degradation products are the main nutrients and flavor precursors in pork products. In this study, protein, total nitrogen (TN), water-soluble nitrogen (WSN), peptides, and free amino acids (FAAs) were analyzed during the production process of Chinese traditional dry-cured bacon, "Laròu." Results indicated that the TN content showed no significant changes throughout the whole process, while the WSN content decreased sharply during the salting period but increased during aging. The sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) profile indicated that protein decomposition effectively took place during the late aging period. A decreasing tendency of the total peptides was observed throughout the aging period. On the contrary, the content of total FAAs increased significantly in the final products. Protein degradation and related flavor compound formation mostly occurred during the aging period of the "Laròu" manufacturing. Practical Applications: "Laròu" is a popular Chinese dry-cured meat product for its special chewiness and flavor. This study investigates the changes in proteolysis during the process of "Laròu" and provides the theoretical bases for the quality improvement of Chinese traditional dry-cured meat products. © 2016 Wiley Periodicals, Inc.


Zhao X.,Key Laboratory for Green Chemical Process of Ministry of Education | Fang Z.,Western Research Institute
Journal of Food Processing and Preservation | Year: 2016

The Chinese traditional dry-cured grass carp fish (Layú) was processed without (A) and with (B, 2%, W/W) Chinese prickly ash, Zanthoxylum Bungeanum Maxim, and the lipid oxidation and fatty acid composition of Layú were investigated. The addition of Chinese prickly ash showed no significant differences (P>0.05) on the nutritional contents of Layú, but significantly inhibited the increase of ratio of polar oil, the content of free fatty acid, peroxide value and TBA (P<0.05). It also inhibited the increase of saturated fatty acids in oil, and the decrease of the content of polyunsaturated fatty acid and polyunsaturated fatty acids during processing. Z. Bungeanum Maxim could effectively delay lipid oxidative decomposition. The contents of DHA and EPA were significantly higher (P<0.05) in Layú B than Layú A. It can be concluded that Z. Bungeanum Maxim can display a protective effect against lipid oxidation during dry-cured fish processing. Practical Application: The addition of Chinese prickly ash can significantly inhibit the increase of ratio of polar oil, the content of free fatty acid, peroxide value and TBA (P<0.05). Z. Bungeanum Maxim can effectively delay lipid oxidative decomposition and improve the quality of Layú. © 2016 Wiley Periodicals, Inc.


Du Z.,Key Laboratory for Green Chemical Process of Ministry of Education | Du Z.,CAS Chengdu Institute of Organic Chemistry | Chen S.,Key Laboratory for Green Chemical Process of Ministry of Education | Shen C.,Key Laboratory for Green Chemical Process of Ministry of Education | And 4 more authors.
Advanced Materials Research | Year: 2012

Effect of copper compounds on the catalytic activity of n-Bu 2SnO in the transesterification of dimethyl carbonate and phenol to diphenyl carbonate was investigated. The results showed that they as promoters could obviously enhance the activity of n-Bu 2SnO except for Cu. The characterizations of X-ray diffraction (XRD) identified that CuO could be reduced to Cu, and Cu 2O was stable. When the reaction was carried out between 150 and 180 oC, with molar ratio of n-Bu 2SnO to Cu 2O of 8:1, catalyst amount 0.0067, reaction time 10h, molar ratio of dimethyl carbonate to phenol of 3:1, the phenol conversion and the transesterification selectivity were 60.3% and 99.2%, respectively. In the transesterification, the acid-base synergistic effect between Cu 2O as the basic promoter and n-Bu 2SnO as the Lewis acid resulted in the active enhancement of n-Bu 2SnO. Moreover the performance of Cu 2O remained unchanged for seven times reuse.


Xu L.,Key Laboratory for Green Chemical Process of Ministry of Education | Liu S.,Key Laboratory for Green Chemical Process of Ministry of Education | Li X.,Central China Normal University
Advanced Materials Research | Year: 2011

In this paper, vinylated magnesium hydroxide (MH) nanosheets were prepared with 3-(trimethoxysilyl) propyl methacrylate (γ-MPS) and pristine MH nanosheets, then the MH/polymer hybrid nanoparticles were prepared by in-situ emulsion copolymerization of vinylated MH nanosheets and styrene (St) monomer and styrene/butyl acrylate (St/BA) comonomer. The morphology, thermal stability and chemical structure of the final products were investigated in detail with transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier-transform infrared spectra (FTIR). The TEM results showed that the core-shell structure of MH/Polymer nanoparticles with MH-cores and Polymer-shell was formed. © (2011) Trans Tech Publications, Switzerland.


Yang X.,Soochow University of China | Li L.,Key Laboratory for Green Chemical Process of Ministry of Education | Yan F.,Soochow University of China
Sensors and Actuators, B: Chemical | Year: 2010

A simple strategy for synthesizing well-defined polypyrrole (PPy) nanotube, which can be used for loading silver nanoparticles without prior PPy nanotube functionalization under mild conditions is demonstrated. It is found that Ag nanoparticles could uniformly decorate onto the PPy nanotube surface in the presence of polyvinylpyrrolidone (PVP) to form PPy/Ag composite nanotubes. Transmission electron microscopy (TEM) images give evidence of the decoration of Ag nanoparticles on the surface of PPy nanotubes. Fourier transform infrared (FTIR) spectra reveal the structure of PPy/Ag composite nanotubes and X-ray diffraction (XRD) directly shows the presence of Ag nanoparticles. The as-prepared PPy/Ag composite nanotubes are applied to the detection of ammonia vapor. Compared with PPy nanotubes, the introduction of metal onto PPy nanotubes is effective in promoting the chemiresistor response to ammonia. Moreover, the response behaviors of PPy/Ag composite nanotubes depend on the distribution of Ag nanoparticles in the nanocomposites. © 2010 Elsevier B.V. All rights reserved.


Wang W.,Wuhan Institute of Technology | Wang C.,Key Laboratory for Green Chemical Process of Ministry of Education | Zhou F.,Key Laboratory for Green Chemical Process of Ministry of Education | Qin Y.,Key Laboratory for Green Chemical Process of Ministry of Education | And 2 more authors.
Advanced Materials Research | Year: 2012

The numeric method of the total quantity of ineffective reflux on tower top of binary batch distillation of total reflux and top accumulation under N +1→∞ and ideal operation conditions is introduced. Energy consumption of binary batch distillation under total reflux and top accumulation is analyzed using the calculated results of examples, and a conclusion that, for the separation task that the low-efficiency energy consumption is large in proportion to its total energy consumption, its total energy consumption is visibly reduced by making a reduction in the mixing level of flowing liquid in top vessel.


Wang D.,Key Laboratory for Green Chemical Process of Ministry of Education | Wang D.,Wuhan Institute of Technology | Xuan A.,Key Laboratory for Green Chemical Process of Ministry of Education | Xuan A.,Wuhan Institute of Technology | And 5 more authors.
Fluid Phase Equilibria | Year: 2011

Gas-liquid equilibrium (GLE) data for the binary systems of {CO+DMC} and {O2+DMC} were respectively measured at 298.15-313.15K and at 2.0-9.0MPa. The modified UNIFAC model proposed by Sander et al. [10] was employed to correlate the experimental and literature GLE data for the binary systems of {CO+DMC}, {O2+DMC} and {CO2+DMC} in a wide range of temperatures and pressures. At the same time, the missing energy parameters unm of the carbonate group -OCOO- with the group CO, O2, CO2 and -CH3 in the modified UNIFAC model were determined. It is indicated that the calculated GLE data using the new UNIFAC parameters are consistent with the experimental GLE data in this work and in literature. The results of this work are necessary and helpful for the UNIFAC database, which not only extend the application field of the UNIFAC model, but also are useful for the design of reactor and separation apparatus in DMC production. © 2010 Elsevier B.V.


Xu L.,Key Laboratory for Green Chemical Process of Ministry of Education | Liu S.,Key Laboratory for Green Chemical Process of Ministry of Education
Advanced Materials Research | Year: 2011

The magnesium hydroxide (MH) whiskers were modified with 3-(trimethoxysilyl) propyl methacrylate (γ-MPS) followed by in situ copolymerization of styrene. The high impact polystyrene (HIPS)/MH composites were prepared by melt compounding of HIPS with untreated MH whiskers and modified MH whiskers (MMH), respectively. Their morphological structure and rheological properties were characterized by scanning electron microscopy and capillary rheometer. The results show that the HIPS/MH composites are a shear-thinning non-Newtonian, its apparent viscosities are bigger than those of the HIPS melt. With increasing MH loading, apparent viscosity of HIPS/MH composites increase. The PS encapsulated on MH whiskers surface enhanced the interface adhesion between inorganic particles and HIPS matrix and improved the flow abilities of the HIPS/MH composites melts. © (2011) Trans Tech Publications, Switzerland.

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