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

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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 g for the systems did Not change obviously while at higher MP loading (higher than 20 phr) 

Determination of resorcinol on glassy carbon electrode modified by carbon nanotube and its application in wastewater analysis

Abstract about interesting chemistry news articles for adsorptive stripping method for the determination of resorcinol on multi-walled carbon nanotube modified glassy carbon electrode (MWNT-GCE) was developed. Cyclic voltammetry was used in the study of the electrochemical behavior of resorcinol on MWNT-GCE. The sharp peak of resorcinol appeared at 0.6 V (vs. Ag/AgCl) with the differential pulse voltammetry (DPV). The experimental parameters were optimized. Anodic peak currents were linear over the resorcinol concentrations in the range of 5.5×10-5-3.3×10-3 g L-1 with a detection limit of 1.1×10-5 g L-1 and relative standard deviations of 3.30-6.94% for 7 determinations. The interference of organic and inorganic species on the voltammetric response was also tested. The proposed method was applied to the determination of resorcinol in tap water and simulative wastewater samples with an average recovery of 95.2-104.8%.
Keywords Determination; Carbon nanotube; Modified glassy carbon electrode; Differential pulse …

Determination of Tanshinone IIA in two kinds of Chinese traditional patent medicines by HPLC

Abstract A HPLC method for the determination of Tanshinone IIA in the Dan Qi Pian and Tong Mai Chongji was established. The sample was dissolved in methanol and extracted by ultrasound, then chromatographed on LUNA-C18 column with mobile phase of methanol-water (84:16). The flow rate was set at 0.8mL/min and the detection wavelenghth was of 270nm. This HPLC method is simple, rapid and accurate, it can be used to determine Tanshinone IIA in the Dan Qi Pian and Tong Mai Chongji quantitatively .
Keywords Tanshinone IIA, Dan Qi Pian, Tong Mai Chongji, HPLC

Dan Qi Pian and Tong Mai Chongji are general Chinese traditional patent medicines. Although they are edited in the eighth volume(1993) of Medicine Standards published by the Ministry of Health of the Peoples Republic of China, there was not any determination method for their effective components. Hence it was difficult to examine the quality …