On the thermal expansion of nanohole free volume in perfluoropolyethers

Article Abstract:

A study is conducted to determine the free volume in polymers, positron annihilation lifetime spectroscopy data that are transformed into nanohole volumes by modeling the cavaties as spheres or, more generally, using geometries assuming an isotropic thermal expansion. A comparison of holelattice theory with positron and dilatometric data for a homologous series of perfluoropolyethers suppliers information on the anisotropic expansion of nanoholes is presented.

Polymers, Ethers, Ethers (Class of compounds), Positron annihilation

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Photoinduced electron and proton transfer in the hydrogen-bonded pyridine-pyrrole system

Article Abstract:

A detailed analysis of the mechanism of photoinduced electron and proton transfer in the planar pyrrole-pyridine hydrogen-bonded system, a potential model of the characteristic ultrafast hydrogen bond photochemistry of DNA base pairs is presented.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Pyridine, Hydrogen bonding, Hydrogen bonds, Electron transport, Structure, Pyrrole, Pyrroles

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