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Du M.-M.,Yankuang Guohong Chemical Co. | Ng S.W.,University of Malaya | Ng S.W.,King Abdulaziz University
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title polymeric complex, [Zn2(C6H 2O4S)2(C4H9NO) 2]n , each carboxyl-ate group of the thio-phene-2,5- dicarboxyl-ate dianion bridges a pair of inversion-related dimethylacetamide- coordinated ZnII atoms, generating a layer motif parallel to (101). The ZnII atom shows a distorted square-pyramidal coordination; the apical site is occupied by the O atom of the dimethylacetamide mol-ecule, whereas the four basal sites are occupied by carboxylate O atoms. In the crystal, the dimethylacetamide molecule is disordered over two positions in a 0.72 (1):0.28 (1) ratio in respect of the C atoms. © Du and Ng 2011.


Fan H.,East China University of Science and Technology | Ji Z.,East China University of Science and Technology | Song S.,Yankuang Guohong Chemical Co. | Wang Z.,Yankuang Guohong Chemical Co. | Fang Y.,East China University of Science and Technology
Hecheng Shuzhi Ji Suliao/China Synthetic Resin and Plastics | Year: 2012

The authors studied transesterification reaction kinetics of bisphenol A and diphenyl carbonate with tetrabutyl ammonium hydroxide as catalyst. The integral rate equation expressed in phenol molar concentration was deduced according to the functional group model. The prepolymerization reaction equilibrium constant at different temperatures, the positive and the reverse reaction rate constant, the activation energy and the reaction heat were acquired. The transesterification belonged to the second order reaction. The reaction was exothermic one with the reaction heat of -17.45 kJ/mol and the activation energy of 77.170 kJ/mol. The effects of reaction temperature and catalyst amount on the reaction rate were investigated. The experimental data accord well with the functional group model, which can provide the later experimental design with a certain theoretical guidance.


Fan H.,East China University of Science and Technology | Ji Z.,East China University of Science and Technology | Song S.,Yankuang Guohong Chemical Co. | Wang Z.,Yankuang Guohong Chemical Co. | And 2 more authors.
Hecheng Shuzhi Ji Suliao/China Synthetic Resin and Plastics | Year: 2012

The polycarbonate prepolymer was synthesized from diphenol carbonate (DPC) and bisphenol-A (BPA) with tetrabutyl ammonium hydroxide as catalyst via melt transesterification. The influence of the catalyst dosage, antioxidant type and molar ratio of DPC/BPA on chromatic aberration of the resultant polymer were studied. When the molar ratio of DPC/BPA was 1.05 with K7 as antioxidant, the prepolymer had the lowest chromatic aberration of 0.11 under the optimized conditions.

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