Nagy, LajosOsukuová, Viktorie2016-05-062016-05-062016-05-05http://hdl.handle.net/2437/226613This study was performed because of the importance of PIBs. I studied PIBs with olefin, chlorine and hydroxyl end groups using a soft ionization technique (DART-MS) using helium gas stream at a temperature of 400oC, it was important to note that if the temperature is low, the ability of evaporation of the higher molecules to take place is also low. At low temperatures only the only the lower molecules evaporate leaving the higher molecules. Therefore the lower molecules are seen only in the MS spectrum, which will result in lower average molecular weight. In turn if the temperature is increased, the higher molecules can then evaporate but if the temperature is too high this can result in thermal degradation. In my experiment no sample preparation was necessary – the samples were introduced under ambient conditions manually. I made measurements in negative and positive ion modes and from the results of the experimental data it can be seen that in negative ion mode I was able to study the intact molecule and determine the number average molecular weight, molecular weight average, polydispersity. In negative ion mode it was impossible to select and study the chlorinated ions because it could not be detected and no fragmentation was observed. In positive ion mode there was extensive fragmentation with series of intensities which occurred due to in source fragmentation when the polymers where put into the ion source and part of the polymer fragmented. Oxidative side reactions also occurred in the ion source giving rise to series c, normally the polymer spectrum does not contain this series but as the polymer came in contact with the air in the ion source the series was formed- it has a difference of 16( mass of oxygen) from series a. In positive ion mode I was able to select the chlorinated ions and study the fragments, which I observed that the polymer fragments at any of the arms of the initiator moiety, either loosing one arm or both arms.30enCC0 1.0 Universaltandem MSDARTpolyisobutyleneDEENK Témalista::Kémia