Category: Polymer

Chemistry Complex Polymer

Effects of cation-anion on recognition characteristics of sarafloxacin -Co(II) complex imprinted polymer in aqueous media the other tested compoun

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In this Chemistry Magazine,you have chemistry related news about a molecularly imprinted polymers (MIP) for sarafloxacin was prepared by the use of itaconic acid as the functional monomer and ethylene glycol dimethacrylate as the crosslinking monomer. But we will also show you the funny side of chemistry, as we earlier discussed the games we stumbled on. Why don’t you take a free test at the casino laboratory by discovering the best casino bonus chips at freecasinogameschips.com? You will find many games that will satisfy your scientific potential. Not let’s go back to the real topic, shall we? To improve selectivity, cobalt(II) ions was used to form metal-template complex, which provided the specific binding sites similar to metal-chelate antibody. The influences of different anions and cations on the recognition performance of the MIP were investigated in protic solvent. Due to the specific structure of the complex of cobalt(II)-sarafloxacin, it increased …

Chemistry Complex Polymer

Preparation and characterization of high molecular weight poly(L-lactic acid) by chain extending

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Abstract Poly(L-lactic acid) (PLLA) of high molecular weight was prepared by chain extending reaction in a micro-compounder. Phosphites were used as chain extenders to increase the molecular weight of the PLLA prepolymer that was prepared by bulk polycondensation of L-lactic acid. Chemistry Magazine Online shows the effects of the amount of the phosphite, temperature and the screw speed were studied on the torque of PLLA melt in mixing. There’s also another thing that this magazine provides, something you can do in your free time. We truly recommend you to visit our friends on BestFreeSlots, if you would like to try some new and entertaining thing to do when relaxing. It’s definitely worth your visit. Under the optimal conditions, the molecular weight of the PLLA could increase from 62,100 g/mol to 126,000 g/mol by the triphenyl phosphite. The chemical structure were characterized by FTIR and 1H NMR and crytallinity …

Chemistry Complex Crystal Polymer

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

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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 …

Complex Oxidation Polymer

Pinacolization of Aromatic Aldehydes using Zn

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Zang Hongjun, Li Jitai#, Bian Yanjiang#, Li Tongshuang#
(Research Institute of Elemento-organic Chemistry, Key Labortary of Elemento-organic Chemistry, Nankai University, Tianjin.300071; #College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China)

Received Sep.28, 2002. The project was supported by NSFC (29872011), Educational Ministry of China and Educational Department of Hebei Province; Natural Science Foundation of Hebei Province supported the project.

Abstract The coupling reaction of aromatic aldehydes leading to pinacols were carried out by using Zn/montmorillonite K10-ZnCl2 in 50% aqueous THF under ultrasound with 23-87% yield.
Keywords pinacolization, aromatic aldehyde, ultrasound

1 INTRODUCTION

1,2–Diols are very useful synthons for a variety of organic syntheses[1]. They can be used as intermediates for the preparation of ketones and alkenes. More importantly, the pinacol coupling has been applied to the synthesis of biologically active natural compounds[2].
The …