Abstract
Two syndiotactic polypropylene (sPP) samples prepared by homogeneous and supported metallocene catalysts respectively were fractionated by preparative temperature rising elution fractionation (TREF). Some fractions were selected for characterization of 13C NMR, DSC, and intrinsic viscosity. Molecular weight and syndiotacticity have different influence on the fractionation of these two samples. In the fractionation of sPP prepared by homogeneous metallocene catalyst (sPP-1), the first eight fractions showed differences mainly in syndiotacticity, but the late fractions had similar syndiotacticity and differed in molecular weight. For the sPP prepared by supported metallocene catalyst (sPP-2), the fractionation is based on syndiotacticity in the whole elution temperature range. The influence of immobilization on the intermolecular heterogeneity and microstructure of polymer was also examined. The fractionation data show that the fractions of sPP-2 have broader syndiotacticity distribution and melting temperature range, indicating that the intermolecular heterogeneity of sPP-2 is more serious than that of sPP-1. This may originate from heterogenization of active site after immobilization of a metallocene catalyst on a carrier. It is also observed that immobilization leads to the decrease of syndiotacticity.
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Xu, J., Deng, Y., Feng, L. et al. Temperature Rising Elution Fractionation of Syndiotactic Polypropylene Prepared by Homogeneous and Supported Metallocene Catalysts. Polym J 30, 824–827 (1998). https://doi.org/10.1295/polymj.30.824
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DOI: https://doi.org/10.1295/polymj.30.824