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Abstract
Abstract The copolymerization of styrene and ethylene was carried out in the presence of two different catalyst systems; i.e., CpTiCl3-methyl aluminoxane and TiCl4-methyl aluminoxane. The structure of polymers was investigated with 13C-NMR (nuclear magnetic resonance) spectroscopy, DSC (differential scanning calorimetry) and XRD (X-ray diffractometry). From the analyses of the 13C-NMR and XRD data, the molecular structure of the styrene-ethylene copolymer produced over the CpTiCl3 catalyst system seems to indicate that the ethylene units are randomly distributed in the syndiotactic polystyrene main chain as defects. Whereas the molecular structure of the styrene-ethylene copolymer produced over the TiCl4 catalyst seems to indicate that the styrene units are randomly distributed in the polyethylene main chain as defects.
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