Jay Nematollahi

Synthesis of Unsymmetrically Substituted Hexahydroimidazo [4,5-d] Imidazole-2,5-diones and Elucidation of Reaction Pathways

Abstract We have reported the synthesis and structural elucidation of a series of hexahydroimidazo [4,5-d] imidazole-2,5-diones and hydantoins from glyoxal and substituted ureas.1,2 The general equation of this condensation reaction and a few representative compounds: those reported, current and hypothetical, are depicted in Scheme 1.

Sorption of a Group of Dicarboxylic Acids by an Insoluble Polyamide

To develop a body of knowledge in regard to solute-polymer interactions, a study was initiated to investigate the sorption characteristics of a group of dicarboxylic acids when nylon-6,6 was used as the substrate. Results demonstrated the importance of the hydrophobic moiety in the group of acids.

Pyrolytic characterization of some plastics by a modified gas chromatography

Abstract An unconventional programmed pyrolysis was designed for the characterization of certain plastics, primarily those employed in medicine. The generally employed GC Packed Column was replaced by a stainless steel column containing glass wool, and a programmer was designed to elevate the temperature of the platinum pyrolysis filament in steps. Using a dual channel recorder, the signals from the flame ionization detector were recorded in one channel and the temperature of the filament in the other. The results obtained from the pyrolysis of a number of polyvinyl chlorides and polyacrylonitriles indicated that the method has the potential of providing characteristic “fingerprint-like” peak patterns for each polymer formulation.