Premium
Copolymerization of styrene and ethylene with mononuclear and dinuclear half‐titanocenes
Author(s) -
Lee DongHo,
Yoon KeunByoung,
Kim HyunJoon,
Woo SangSun,
Noh Seok Kyun
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980328)67:13<2187::aid-app9>3.0.co;2-a
Subject(s) - copolymer , styrene , polystyrene , polymer chemistry , ethylene , polymer , materials science , differential scanning calorimetry , polyethylene , chemistry , catalysis , organic chemistry , physics , thermodynamics
With mononuclear half‐titanocenes such as CpTiCl 3 , IndTiCl 3 , and Me 5 CpTiCl 3 , as well as the constrained geometry catalyst (CGC) and a new dinuclear hexamethyltrisiloxanediylbis(cyclopentadienyltitanium trichloride) (TSDT), the copolymerization of styrene and ethylene was examined. The thermal properties and structure of copolymerization products were investigated with differential scanning calorimetry and 13 C‐nuclear magnetic resonance. In addition, the raw polymer was separated into homopolymer and copolymer with an extraction method and cross fractionation chromatography. With the above analysis, it was concluded that the raw polymer obtained with CpTiCl 3 and IndTiCl 3 was a mixture of syndiotactic polystyrene and polyethylene homopolymers with 10–30 wt % copolymer, whereas that produced by Me 5 CpTiCl 3 and TSDT was a homopolymer mixture with a negligible amount of copolymer. Only CGC produced the copolymer of styrene and ethylene perfectly. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:2187–2198, 1998