Since the classical work of Crum Brown and Fraser, the curariform action of many onium salts has been recognized, and other activities exerted by these compounds have been described, such as those commonly called nicotine-like or muscarine-like. In the present paper an account is given of the actions of members of a polymethylene bistrimethylammonium series, whose general formula is (CH,), N+(C...

Molecular dynamic simulation of low temperature plastic deformation (Tdef = 50 K, Tdef/Tg ≤ 0.3) is studied for glassy polymethylene under the regime of active uniaxial compression and tension for a cell composed of 64 chains containing 100 –CH2 groups in each (as united atoms) and with periodic boundary conditions. Thirty two such cells are created, and, in each cell, polymethylene chains in t...

We report the preparation of a new class of copolymer films that consist of polymethylene (PM) with a low percentage ( approximately 1-4%) of randomly distributed ethyl ester side groups, consistent with poly(methylene-co-ethyl acetate). The films are prepared through a surface-catalyzed polymerization on gold surfaces upon exposure to a dilute solution of diazomethane (DM) and ethyl diazoaceta...

Superhydrophobic polymethylene (PM) films provide remarkable protection against the transport of aqueous redox probes as a result of entrapped air at the water/polymer interface. The wetting properties and the topography for a set of superhydrophobic (SH) and nonsuperhydrophobic (NSH) PM films were established to compare their interfacial behavior using electrochemical impedance spectroscopy (E...

This paper discusses methods to discover frequent, discriminative connected subgraphs (fragments) in a database of molecular structures. We present an extension to a well-known algorithm that allows for the discovery of fragments that contain chains of atoms of varying length. This is particularly important for real-world applications (for example drug discovery or synthetic success prediction)...