Changzhou Institute of Chemistry

Changzhou, China

Changzhou Institute of Chemistry

Changzhou, China

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Wang Z.,CAS Chengdu Institute of Organic Chemistry | Wang Z.,Changzhou Institute of Chemistry | Wang Z.,University of Chinese Academy of Sciences | Yang X.,CAS Chengdu Institute of Organic Chemistry | And 7 more authors.
RSC Advances | Year: 2015

A simple and efficient route for one-pot synthesis of high-molecular-weight aliphatic polycarbonates (APCs) by direct melt transesterification of diphenyl carbonate (DPC) with aliphatic diols at equimolar amounts was developed. Zn(OAc)2 was found to be the best catalyst for this reaction among the screened transition metal acetates. The effects of reaction conditions on Mw and yield of the poly(1,4-butylene carbonate) (PBC) were investigated, where the highest Mw of 156 200 g mol-1 with a yield of 83% was obtained under suitable reaction conditions. In addition, based on the results of thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR), a plausible reaction mechanism over Zn(OAc)2 was proposed for APC synthesis. © The Royal Society of Chemistry 2015.


Zhang T.,CAS Chengdu Institute of Organic Chemistry | Zhang T.,University of Chinese Academy of Sciences | Zhang T.,Changzhou Institute of Chemistry | Yang X.,CAS Chengdu Institute of Organic Chemistry | And 7 more authors.
Acta Polymerica Sinica | Year: 2012

Polycarbonate is synthesized by melt transesterification of diphenyl carbonate (DPC) with bisphenol A (BPA). The catalytic activity of metal acetylacetonates and the effects of the stronger or weaker bond between the catalyst and the reactant, catalyst concentration, initial monomer molar ratio, initial pressure and temprature are investigated. The logarithms of the stability constants (lgβ1) of dibenzoyl methane (DBM) complexes of the corresponding metal species are regarded as corresponding to the bond strength between metal species (catalyst) and benzoyl group (reactant) ,which are correlated by double volcanoes-shaped relationship with the intrinsic viscosity ([η]) of the PC produed with the corresponding metal acetylacetonates as catalysts. Consequently, the catalytic activity of the metal compounds is affected by the basic of acetylacetonate anion and the chelating capacity of each metal species, which is found to be very useful in forecasting the catalytic activity of the metal compound. In all the catalysts, lithium acetyacetonate (Li AC AC) is the best one, by which the sample catalyzed has the lowest fries level and polydispersity index (PDI=2.12), besides its colorless and high molecular weight ([η]=0. 710 dL · g-1 ). Our study exhibites that the best reagent molar ratio: nBPA : n DPC : nLiACAC = 1.0 : 1.08 : 1.5 X 10-4, the optimal initial pressure in the transesterification stage; 4000 Pa and the optimal melt polymerization temperature 260 °C.


Fan Y.,CAS Chengdu Institute of Organic Chemistry | Fan Y.,Changzhou Institute of Chemistry | Fan Y.,University of Chinese Academy of Sciences | Wang Q.,CAS Chengdu Institute of Organic Chemistry | And 5 more authors.
Cuihua Xuebao/Chinese Journal of Catalysis | Year: 2010

The catalytic activity of KF/MgO for the synthesis of didodecyl carbonate (DDC) by transesterification of dimethyl carbonate (DMC) with dodecanol (DoOH) was studied. The effects of KF loading and calcination temperature were investigated. The catalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and N2 adsorption-desorption. The results indicated that new phases K2MgF4 and K2CO3 were formed when KF/MgO was calcined in air at high temperature. K2MgF4 and K2CO3 were the main catalytic sites in this reaction. KF/MgO was an effective catalyst in this transesterification reaction and the optimized KF loading and calcination temperature were 30% and 873 K, respectively. The optimized reaction conditions were as follows: n(DoOH):n(DMC)=4, catalyst amount 0.75%, reaction time 4 h. Under these conditions, the conversion of DMC and the yield of DDC were 86.7% and 86.2%, respectively.


Ren Y.,Changzhou University | Ding J.,Changzhou University | Yuan N.,Changzhou University | Jia S.,Changzhou Institute of Chemistry | And 2 more authors.
Journal of Solid State Electrochemistry | Year: 2012

Silicon monoxide/graphite/multi-walled carbon nanotubes (SiO/G/CNTs) material was prepared by ball milling followed by chemical vapor deposition method and characterized by X-ray diffraction, scanning electron microscopy (SEM), galvanostatic charge-discharge, and AC impedance spectroscopy, respectively. The results revealed that SiO/G/CNTs exhibited an initial specific discharge capacity of 790 mAh g -1 with a columbic efficiency of 65%. After 100 cycles, a high reversible capacity of 495 mAh g -1 is still retained. The improved electrochemical properties were due to beneficial SEI by the SEM and EIS results. © 2011 Springer-Verlag.


Wang Z.,CAS Chengdu Institute of Organic Chemistry | Wang Z.,University of Chinese Academy of Sciences | Wang Z.,Changzhou Institute of Chemistry | Yang X.,CAS Chengdu Institute of Organic Chemistry | And 7 more authors.
Journal of Molecular Catalysis A: Chemical | Year: 2016

Various solid bases were synthesized and used as catalyst for direct transesterification of diphenyl carbonate (DPC) with aliphatic diols to synthesize high-molecular-weight aliphatic polycarbonates (APCs). Physical-chemical properties of these catalysts were characterized by means of different techniques to show the relationship between catalyst structure and catalytic performance. MgO prepared via simple coprecipitation method was found to be the most active catalyst among all the solid bases and magnesium compounds tested in the present study. The high-molecular-weight poly(1,4-butylene carbonate) (PBC) could be easily obtained over this MgO with Mw up to 182 200 g/mol under its optimization condition. Additionally, the amplification experiment in a 5.0 L stainless steel reactor also verified the reliability of this transesterification process with MgO as catalyst, giving maximum Mw value for PBC as high as 208 600 g/mol. It was found that medium and strong basic sites were responsible for this transesterification process. Simultaneously, strong basic sites also could favor the decomposition and depolymerization of the resultant PBC, leading to the decrease for Mw and yield at higher temperature. In addition, based on the experimental results and relevant literature, a plausible reaction mechanism involving the activation of diols via the abstraction of proton with basic site over MgO was proposed for this process. © 2016 Elsevier B.V.


Wang Z.,CAS Chengdu Institute of Organic Chemistry | Wang Z.,Changzhou Institute of Chemistry | Wang Z.,University of Chinese Academy of Sciences | Yang X.,CAS Chengdu Institute of Organic Chemistry | And 7 more authors.
Chemical Research in Chinese Universities | Year: 2016

High-molecular-weight aliphatic polycarbonates(APCs) were synthesized through a two-step transesterification process under solvent-free conditions. Oligomers with equal numbers of hydroxyl and phenyl carbonate terminal groups could be easily controlled by using equimolar amounts of diphenyl carbonate(DPC) and aliphatic diols as feedstocks in the first step. In the second step, the high-molecular-weight APCs can be obtained by connecting ―OH with OC(O)OC6H5 end-group upon removing the generated phenol at reduced pressure. Mg(OAc)2 was found to be the best catalyst for this process among the screened catalysts, which gave the poly(1,4-butylene carbonate)(PBC) a weight-average molecular weight(Mw) of 148600 and a yield of 84.8% under its suitable reaction conditions. In addition, based on the results of X-ray diffraction(XRD), scanning electron microscopy(SEM) and fourier transform infrared spectroscopy(FTIR), a possible reaction mechanism over Mg(OAc)2 was proposed for APCs synthesis. © 2016, Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH.


Mamat X.,CAS Xinjiang Technical Institute of Physics and Chemistry | Mamat X.,University of Chinese Academy of Sciences | Wang Y.,CAS Xinjiang Technical Institute of Physics and Chemistry | Wang Y.,Changzhou Institute of Chemistry | Eli W.,CAS Xinjiang Technical Institute of Physics and Chemistry
Polymers for Advanced Technologies | Year: 2012

The maleic acid-castor oil monoester (MACO) was synthesized and was used as monomer to synthesize a new potentially environmentally friendly copolymer of styrene and MACO (poly-St/MACO) by suspension polymerization. Under the appropriate conditions, the poly-St/MACO with yield of 81%, number average molecular weight of 44100g/mol, and molecular weight distribution of 1.5 could be obtained. The chemical structures of the MACO and resulting copolymer were confirmed by Mass Spectrometry Infrared Spectroscopy and Nuclear Magnetic Resonance Spectroscopy H[1]. The results of thermogravimetric analysis and biodegradation test showed the poly-St/MACO can be used as a new potentially environmentally friendly material with excellent thermal stability. © 2011 John Wiley & Sons, Ltd.


Wang Y.,Changzhou Institute of Chemistry | Wang Y.,CAS Xinjiang Technical Institute of Physics and Chemistry | Mamat X.,CAS Xinjiang Technical Institute of Physics and Chemistry | Eli W.,CAS Xinjiang Technical Institute of Physics and Chemistry
China Petroleum Processing and Petrochemical Technology | Year: 2011

This article covers a method for synthesizing environmentally friendly multifunctional metal (calcium, magnesium) oléate detergents with antioxidation property. These multifunctional metal (calcium, magnesium) oléate detergents with antioxidation property were synthesized using oil-soluble liquid antioxidants (PPIBP, PPIBTSTBP, and PPIBPDA) as reactive functional materials. These oil-soluble liquid antioxidants have the potential to be used as functional materials for application in synthesizing other kinds of substrate detergents.


Liu T.-Z.,Jiangxi Science and Technology Normal University | Liu Y.,Nanchang University | Duo S.-W.,Jiangxi Science and Technology Normal University | Sun X.-G.,Changzhou Institute of Chemistry | Li J.,Jiangxi Science and Technology Normal University
Xinxing Tan Cailiao/New Carbon Materials | Year: 2013

Water vapor-assisted chemical vapor deposition was used to prepare vertically-aligned carbon nanotubes (ANTs) on a quartz substrate by using ferrocene as a catalyst precursor and xylene as a carbon source. The morphologies of the ANTs were investigated by TEM and SEM. Results showed that under optimized growth conditions ANTs were grown on the substrate with an area of 60×140 mm2 and a thickness of 2.05 mm. The ANTs emit strong white light under microwave radiation, indicating that they are a potential microwave absorption material.


Wang Y.,Changzhou Institute of Chemistry | Wang Y.,CAS Xinjiang Technical Institute of Physics and Chemistry | Mamat X.,CAS Xinjiang Technical Institute of Physics and Chemistry | He Z.,CAS Xinjiang Technical Institute of Physics and Chemistry | Eli W.,CAS Xinjiang Technical Institute of Physics and Chemistry
Industrial and Engineering Chemistry Research | Year: 2011

In order to improve the utilization efficiency of carbon dioxide and calculate the amount of carbon dioxide better, a series of magnesium salt detergents (including magnesium oleate, magnesium linoleate, magnesium isostearate and magnesium sulfonate) was synthesized using a novel method of quantitative carbon dioxide, and this method has the potential for synthesizing more organic acid magnesium salt detergents. © 2011 American Chemical Society.

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