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A study of the effect of styrene concentration on the molecular weight of polypropylene produced using metallocene catalysts

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It has been observed in the production of polypropylene nanocomposites containing silicate materials that the molecular weight of the polymer used can have a significant effect on the final quality of the composites. The availability of polypropylene over a range of molecular weights with similar material properties (e.g. melting temperature and tacticity) is limited. Therefore, the ability to use a single catalyst system to generate polypropylene with a range of molecular weights is an attractive goal. In this contribution the use of styrene as a chain‐terminating agent is explored, in order to produce materials with a range of molecular weights from a single catalyst system. It is found that the molecular weight of the polypropylene produced can be varied in the range from 120 000 to 9000 g mol−1 using the Me2Si(Ind)2ZrCl2/methylaluminoxane catalyst system. Copyright © 2011 Society of Chemical Industry

Keywords: chain‐termination agent; metallocene; polypropylene; styrene‐terminated

Document Type: Research Article


Publication date: 2011-05-01

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