ABSTRACT. Propene was polymerized at 0 C with tBuNSiMe2C5Me4TiMe2/MAO. Kinetic features and other parameters indicated quasi-living polymerization. Effects of various trialkylaluminiums as additives have been investigated; it was found that compounds with more bulky groups like iBu3Al, Oct3Al increased the activities significantly whereas Me3Al and Et3Al reduced the activities of the catalyst s...

Liquid propylene oxide added to a solution of isopropyl alcohol and incubated at different temperatures markedly reduced the time required to sterilize the alcohol solution.

traditional systems for olefin/paraffin separation, like low-temperature distillation, are expensive and very energy consuming, and therefore, alternative separation methods are desired. facilitated transport membranes are new tools for this separation to be substituted in large scale separation of olefin-paraffin mixtures. to design a membrane process for olefin-paraffin separation, equilibriu...

Two novel N-heterocylic carbene enolate nickel complexes have been prepared and shown to be active for ethylene and propylene polymerization to yield linear polymers.

A glycol nucleic acid (GNA) with an acyclic propylene glycol phosphodiester backbone forms stable antiparallel duplexes following the Watson-Crick base pairing rules.

background compounds present in green tea have proved to inhibit the growth and activity of bacteria associated with infections. objectives to assess the effects of green tea leaves extract in presence of propylene glycol on the aerobic mouth bacteria load. materials and methods saliva of 25 volunteer girl students aging 20-25 years were selected and evaluated by a mouthwash sample containing 1...

the effects of monesin and propylene glycol on feed intake, milk production, and composition as well as some blood metabolites of 16 primiparous and multiparous holstein lactating cows (60±30 days in milk (dim), milk production of 33±3 kg/day) were evaluated. cows were experimentally in a arranged in a randomized complete block design of: 4 feeding treatments, and 2 blocks of either primiparous...

the interaction of the external donor (propyltrimethoxysilane - ptms) with titanium-magnesium catalysts (tmcs) containing dibutylphthalate (dbp) as internal donor, which were prepared in different ways, was studied by chemical analysis and infrared diffuse reflectance spectroscopy (drifts). the chemical composition of the catalysts after their interaction with heptane solutions of ptms, ptms/al...