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The calculations performed on the evaluation of the electrostatic potential provide deeper insights into the nature of lp⋯π interactions.

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A semi‐interpenetrating network system [(GG‐g‐PAAm)‐PVA] was made by microwave irradiation of aqueous mixture of gellan gum (GG), acrylamide (AAm), and poly(vinyl alcohol) (PVA) containing N,N′‐methylene‐bis‐acrylamide as crosslinking agent. The gel was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, X‐ray diffraction, and scanning electron microscopy techniques. The swelling behavior was studied under different pH conditions. A pH‐dependent swelling with maximum swelling under neutral pH was observed. The swelling process is found to follow second‐order kinetics and the mechanism of water transport is found to be Fickian type of diffusion. The (GG‐g‐PAAm)‐PVA was evaluated for removal of dye from aqueous solution, using crystal violet, a cationic dye. The maximum adsorption capacity of the gel was found to be 45.45 mg/g. The kinetic studies revealed a second‐order adsorption process which fits well into Langmuir model. The evaluation of thermodynamic parameters indicated the adsorption process to be exothermic and spontaneous at lower temperatures. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45527.

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Group. -Along with their synthesis, the results of studies on the insecticidal activity of a few new oxadiazole derivatives, e.g. (III), are reported. (IIIb) and (IIIc) show low insecticidal activity against A. craccivora. -(MOHAN, T. P.; VISHALAKSHI*, B.; BHAT, K. S.; RAO, K. S.; KENDAPPA, G. N.; Indian J.

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