from which well-defined long-chainpolyamines with different chain lengths, methylation patterns, and subunits can be obtained. Quantitative silica precipitation experiments together with structural information about the precipitated silica structures gained by scanning and transmission electron microscopy revealed a distinct dependence of the amount, size, and form of the silica precipitates on the molecular
A lubricant for a two cycle engine having as a basic oil a polyoxyalkylene glycol derivative expressed by general formula (1) which can realize, when used to lubricate bearing portions and sliding portions of the two cycle engine, remarkable reduction in generation of exhaust smoke, improvement in start-up capability, improvement in cleanability of preventing clogging of an exhaust system with carbon, improvement in cleanability inside the engine at high and low temperatures and improvement in withstand-load properties.