کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
69033 | 48528 | 2006 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Syndiotactic-enriched propylene–styrene copolymers using fluorenyl-based half-titanocene catalysts Syndiotactic-enriched propylene–styrene copolymers using fluorenyl-based half-titanocene catalysts](/preview/png/69033.png)
The constrained geometry complexes {3,6-tBu2C13H6SiMe2NtBu}TiCl2 (X = Cl, 1; Me, 2), in combination with MAO or borane activators, have been investigated in the copolymerization of propylene with styrene at 25–60 °C, 1–5 atm. Both systems were found to give styrene–propylene (PP–PS) copolymers with up to 24 mol% of styrene incorporated and moderate molecular weights (Mw = 14,000–88,000; Mw/Mn = 1.58–2.32). Addition of some ethylene to the styrene–propylene feed improves the catalytic polymerization activity. The PP–PS copolymers feature a syndiotactic-enriched polypropylene microstructure (r > 92%), with randomly distributed single styrene and/or short polystyrene units.
The constrained geometry complexes {3,6-tBu2C13H6SiMe2NtBu}TiX2 (X = Cl, 1; Me, 2), in combination with MAO or borane activators, efficiently copolymerize propylene and styrene in the presence of small amounts of ethylene to afford styrene–propylene (PP–PS) copolymers with a syndiotactic-enriched polypropylene microstructure and randomly distributed single styrene or short polystyrene units. Figure optionsDownload as PowerPoint slide
Journal: Journal of Molecular Catalysis A: Chemical - Volume 249, Issues 1–2, 18 April 2006, Pages 230–235