Syndiotactic polymerization of styrene by 1-(Me)IndTiCl2(OR)/MAO system

Qian, Yanlong; Zhang, Hao; Qian, Xianmiao; Chen, Bin; Huang, Jiling

doi:10.1016/s0014-3057(02)00045-9

Cited by 13 publications

(9 citation statements)

References 31 publications

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“…Previously, the tert-butoxy-substituted half-sandwich titanium complex showed the lowest activity compared with other alkoxy-substituted half-sandwich titanium complexes. 38 Here, the bulky group-substituted complex 3 does not show lower activity than the other complexes. As shown in Table 2, the benzyl substituent on cyclopentadienyl plays a more important role than the alkoxy ligand in syndiotactic styrene polymerization.…”

Section: Methodsmentioning

confidence: 72%

Synthesis of monoalkoxy- and trialkoxy-substituted half-sandwich titanium complexes PhCH2CpTiCl3-n (OR)n (n = 1 or 3) as catalysts for syndiotactic styrene polymerization

Zhang

Chen

Qian

et al. 2005

Appl. Organometal. Chem.

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Two new series of various substituted half-sandwich titanium complexes PhCH 2 CpTiCl 2 (OR) (R = Et (1), i Pr (2), t Bu (3), cyclohexyl (4), benzyl (5)) and PhCH 2 CpTi(OR) 3 (R = Et (6), i Pr (7), t Bu (8), cyclohexyl (9), benzyl (10)) were prepared from PhCH 2 CpTiCl 3 with lithium alkoxide or alcohol in the presence of triethylamine. All complexes were well characterized by 1 H NMR, MS, infrared spectroscopy and elemental analysis or high-resolution MS. Complexes 1-5 have two conformations, which were confirmed by temperature-dependent NMR. All complexes were tested as catalyst precursors for the syndiotactic polymerization of styrene. The syndiotactic polystyrene obtained exhibits low molecular weight (M w = 2.78 × 10 4 ) and narrow molecular weight distribution (M w /M n = 1.50). The different alkoxy ligands affected the activities slightly. The existence of the additional phenyl group on the cyclopentadienyl ligand stabilized the active species more effectively, which was reflected by the activities and syndiotacticities of all complexes, and even at high temperature the activities still kept high. The effects of Al/Ti and time on the syndiotactic styrene polymerization by complex 1 were investigated.

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Section: Methodsmentioning

confidence: 72%

Synthesis of monoalkoxy- and trialkoxy-substituted half-sandwich titanium complexes PhCH2CpTiCl3-n (OR)n (n = 1 or 3) as catalysts for syndiotactic styrene polymerization

Zhang

Chen

Qian

et al. 2005

Appl. Organometal. Chem.

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“…The catalyst is also efficient for the syndiospecific polymerization of styrene. It has been concluded that the structure of donor ligand strongly affects not only the catalytic activity but also the molecular weight of the resulting sPS (13)(14)(15)(16)(17)(18).…”

Section: Introductionmentioning

confidence: 99%

Syndiospecific polymerization of styrene by half-titanocene catalysts with the sulfur-containing donor ligand

2014

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Monocyclopentadienyl titanium complexes of the type Cp*TiX 2 L (Cp* = C 5 Me 5 , 1: L = C 6 F 5 S, X = OMe; 2: L = C 6 F 5 S, X = Cl; 3: L = 2, 6-Me 2 -C 6 H 3 S, X = OMe) have been synthesized with high yields. These complexes are used as the catalysts for the syndiospecific polymerization of styrene. High catalytic activity is observed, and a polymer with high molecular weight and narrow molecular weight distribution is obtained. It is concluded that not only the sulfur-containing donor ligand but also the anion ligand strongly affects the polymerization activity and the molecular weight of the resultant polymer.

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“…In contrast to the isotactic polystyrene, the syndiotactic material shows a fast crystallization rate and high melting point of approximately 275°C, which are similar to those of some expensive engineering plastics. Thus, syndiotactic polystyrene has attracted much attention from polymer scientists 4–5…”

Section: Introductionmentioning

confidence: 99%

Syndiotactic polymerization of styrene: Study of catalyst components and polymerization conditions

Jamjah

Zohuri

Masnadi

et al. 2006

J of Applied Polymer Sci

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Syndiotactic polystyrene (s-PS) was prepared using monotitanocene catalyst of cyclopentadienyl titanium trichloride (CpTiCl 3 ) activated by methylaluminoxane (MAO). Solution polymerization was carried out in toluene using different polymerization conditions. Syndiotacticity index (SI) between 68 and 91.6% was obtained. Increasing Al/Ti molar ratio shows an increase in both conversion percentage and SI. The conversion increased linearly with increasing Al/Ti molar ratio in the range studied. The conversion reached to an optimum value of about 65% at styrene/Al molar ratio of 2.83, while no regular behavior of SI was observed with changing the ratio. Effect of temperature of the range 50 -80°C on polymerization was studied. The most favorable temperature for the polymerization regarding activity is 70°C; however SI decreased with temperature up to 80°C. H 2 value to 140 mL/100 mL solvent increased the productivity of the catalyst, however further increase of H 2 reduced the activity of the catalyst. Polymerization time of 15 to 125 min shows a decrease in activity. The decrease was sharper for about 30 min of polymerization than longer time.

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Syndiotactic polymerization of styrene by 1-(Me)IndTiCl2(OR)/MAO system

Cited by 13 publications

References 31 publications

Synthesis of monoalkoxy- and trialkoxy-substituted half-sandwich titanium complexes PhCH2CpTiCl3-n (OR)n (n = 1 or 3) as catalysts for syndiotactic styrene polymerization

Synthesis of monoalkoxy- and trialkoxy-substituted half-sandwich titanium complexes PhCH2CpTiCl3-n (OR)n (n = 1 or 3) as catalysts for syndiotactic styrene polymerization

Syndiospecific polymerization of styrene by half-titanocene catalysts with the sulfur-containing donor ligand

Syndiotactic polymerization of styrene: Study of catalyst components and polymerization conditions

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