Category: Crystal

Complex Crystal Nanotube Oxidation

Cure Kinetics of Epoxy Resin/MP/Anhydride/Accelerant Flame Retardant Composite

by AngelStgerman on

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Abstract Cure kinetics of epoxy resin E51/MP/methyltetrahydrophthalic anhydride (MeTHPA)/ 2-ethyl-4-methyl-imidazole (2,4-EMI) flame retardant composite were studied using the dynamical tortional vibration method. The influence of MP loadings on The cure showed has improved studied were well. The results showed that the rate of cure reactions depended distinctly on the cure temperature. At low MP loadings, the gelation time t g for the systems did Not change obviously while at higher MP loading (higher than 20 phr) t …

Chemistry Complex Crystal

Synthesis and crystal structure of a novel Salen-copper(II) complex

by AngelStgerman on

Abstract The Salen-copper(II) complex was synthesized by diffusion. Chemistry Online shows the structure which was characterized by single crystal X-ray diffraction. It crystallized in triclinic system,pB1spacegroup, with a=9.3441(18)Å, b=11.478(3)Å, c=12.320(3)Å, a=81.584(11)°, b=74.681(9)°, g=68.206(9), MolecularFormula: C23H19CuN5O8, M=397.86, V=1181.6(5)Å3, z=2, Dc=1.56Mg/m3, R1=0.0416, wR2=0.1236,I>[2s/(I)]. The crystal included a mononuclear complex [Cu(H2L)(DMF)] and a non-coordinated H2O molecular.
Keyword diaminomaleontrile；5-carboxylsalicylaldehyde；crystal structure.

Synthesis and Crystal Structure of a New Salen-Copper (II) Complex

Li Lijun, Yang Dongjie, Gao Yansu
(College of Chemistry and Environmental Science, Hebei University, Baoding, Hebei 071002, China )

Summary diffusion were synthesized Salen- copper (Ⅱ) mononuclear complexes [a Cu (H 2 L) (of DMF)] . H 2 0 [H . 4 L] = N, N’-bis (5-carboxy-salicylaldehyde) – Diaminomaleonitrile. The complexes were characterized by X-ray single crystal diffraction. The complexes belong to triclinic system, …

Chemistry Complex Crystal Polymer

Adsorption and competitive adsorption of heavy metal ions lead, cadmium and copper on d-manganese oxide

by AngelStgerman on

Chemistry Magazine Online gives you another post with interesting chemistry news articles. Abstracts d- MnO2 was prepared with hydrothermal treatment, and its crystalline structure was verified with X-ray diffraction spectroscopy. FTIR showed there were copious hydroxyl groups on the surface of d-MnO2 for the adsorption. The adsorption capacity of three kinds of heavy metal ions Pb2+, Cd2+ and Cu2+ on the d-MnO2 was all increased with the increase of ion concentration and the increase of pH. The adsorption isotherms of Pb2+ exhibited good correlation with Freundlich equations, Langmuir equations and Temkin equations, whereas equilibrium data of Cu2+ was best fitted to Freundlich isotherm, and Langmuir isotherm was best for Cd2+. Adsorption thermodynamics indicates that as the temperature in the range of 298.15 ~ 323.15K, all the adsorptions were endothermic, spontaneous reaction. Therefore, increasing temperature is good for the …

Chemistry Complex Crystal

Kinetic and thermodynamic studies on the adsorption of Ni 2+ onto chitosan-aluminium oxide composite material

by AngelStgerman on

Abstract Kinetics’ and Thermodynamics of The Adsorption of of Ni 2+ Onto Chitosan-Aluminum Composite Material’s WAS Studied oxide. The Under Experimental Conditions, s Indicated Kinetic Adsorption of that of Ni 2+ Onto Aluminum oxide-Chitosan Composite Material’s Conforms to pseudo-SECOND-Order Equation And the apparent adsorption activation energy is 28.62 kJ/mol.In the experimental temperature, Chemistry Magazine Online and thermodynamic studies indicated that adsorption of Ni 2+ onto chitosan-aluminium oxide composite material conforms to Langmuir adsorption isotherm equation. Enthalpy of adsorption ( D H) value is 15.93 kJ/mol and entropy of adsorption( D S)value is 95.43J/(mol· K).Gibbs free energy ( DG) decreases with increasing temperature.
Keywords chitosan; composite material; adsorption;

Adsorption Kinetics and Thermodynamics of Ni 2+ on Chitosan-Aluminum Oxide Composites

MA Zhi-guang, ZHANG Fang, GENG Na, LIU Su-wen, LIU Pan
(College of Chemistry and Environmental Science, Hebei University, Baoding, Hebei 071002, China)

Abstract The kinetics and thermodynamics of Ni 2+ adsorption on …

Chemistry Complex Crystal

Synthesis and characterization of Fire retarded poly (DAMT -co-acrylonitrile)

by AngelStgerman on

Abstract In this paper diethoxy-acrylamide methoxyl thiophosphate (DAMT) was synthesized with the reaction N-hydroxymethyl acrylamide and O, O-diethyl phosphorochloridothioate catalyzed by cuprous chloride in presence of triethylamine, and the flame retarded poly (DAMT-co-acrylonitrile) was obtained though free-radically copolymerized process. The properties of copolymer were estimated by Limiting Oxygen Index (LOI) values and thermogravimetric analysis (TGA). The results showed that the LOI value of copolymer with 20 wt% percentage of DAMT coule reach 27vol%.
Keywords: Diethoxy-acrylamide methoxyl thiophosphate, Polyacrylonitrile, Flame retardants, Thermal analysis, Limiting Oxygen Index

1 INTRODUCTION
Polyacrylonitrile (PAN) is widely used in many aspects because it is easily processed into products of various shape with well flexibility and retention at break to meet the requirements of versatile and advanced applications. However, the combustion of PAN is very easy when it is ignited, which makes it difficult to be used in some ways. Thus, the flame retardant PAN is required …

Chemistry Complex Crystal

De Novo drug design of anti-cancer drug imatinib’s analogues

by AngelStgerman on

Abstract Based ON The Crystal Structure of of Imatinib and tyrosine kinase Complex (the PDB ID: 2HYY)., The Active Structure and pharmacophores of Imatinib, and The Interaction BETWEEN Imatinib and The Active Site of tyrosine kinase have have been Explored It WAS found that The methylpiperazin Group In imatinib bound to the active site of tyrosine kinase weaker than other substructure, and there are no important pharmacophores, so this part structure of imatinib can be rebuilt. Further molecular design of anti-cancer drug imatinib’s analogues was carried out by De Novo Drug Design Method, 199 molecules were obtained at first, and 10 molecules with high score were screened by docking software, this research results shows that imatinib ‘s analogues with potential for effective tyrosine kinase inhibitors.
KeyWords anti-cancer drug; imatinib; analogue; De Novo drug design

Initio Molecular Design of Antitumor Drugs Imatinib Derivatives

Abstract In this paper, the structure of tyrosine …