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Characterization of polypropylenes prepared with bis‐indenyl type metallocene and MgCl 2 ‐supported TiCl 4 catalyst systems
Author(s) -
Kashiwa Norio,
Imuta Junici,
Tsutsui Toshiyuki,
Hama Shunichi,
Kojoh Shinichi
Publication year - 2000
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200010)159:1<19::aid-masy19>3.0.co;2-7
Subject(s) - polypropylene , metallocene , ethylene , materials science , polymer , catalysis , polymer chemistry , characterization (materials science) , ziegler–natta catalyst , tacticity , nuclear chemistry , polymerization , chemical engineering , chemistry , composite material , organic chemistry , nanotechnology , engineering
The homo‐polypropylene: m‐PP, prepared with rac ‐Me 2 Si[2‐ n ‐Pr‐4‐(9‐Phenanthryl)‐Ind] 2 ZrCl 2 , showed 99.6% of [mmmm] and 162.8°C of melting temperature (Tm). This polymer was compared by TREF analysis with the homo‐polypropylene: Ti‐PP, which was produced by our latest MgCl 2 ‐supported TiCl 4 catalyst system and showed 99.0% of [mmmm] and 165.7°C of Tm. It was indicated that m‐PP has narrower stereoregurality distribution than Ti‐PP and Tm of the fraction eluted from m‐PP at the highest temperature range is 163.6°C, while that from Ti‐PP reaches to 167.3°C. The characters and advantages of each polymer are discussed on the basis of these results. In addition, an advantage of this metallocene was made clear by characterization of polypropylenes copolymerized with ethylene.