Copolymerization of styrene and butadiene with Co(acac)3-methylaluminoxane catalyst

Endo, Kiyoshi; Matsuda, Yuichi

doi:10.1002/1521-3935(20000801)201:13<1426::aid-macp1426>3.0.co;2-j

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…Co (acac) 3 /MAO catalysts might be used for the copolymerization of styrene and butadiene [14] .The copolymer was a high cis-1 ,4 -structure and with high Mr. Multicore pyridine diimine Fe catalyst 21 could also be catalyzed ethylene polymerization. The maximum temperature of the active region was about 25℃ ~ 35 ℃.…”

Section: Other Ligand Catalystsmentioning

confidence: 99%

Progress in Development of Catalyst Systems for Coordinated Polymerization of Olefins

Zhou¹,

Zhong²,

Li³

2014

AMR

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Section: Other Ligand Catalystsmentioning

confidence: 99%

Progress in Development of Catalyst Systems for Coordinated Polymerization of Olefins

Zhou¹,

Zhong²,

Li³

2014

AMR

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“…Recent achievements in the stereospecific copolymerization of ST and BD with transition‐metal catalysts has provided alternative routes to improving the mechanical properties of these materials through the control of the cis selectivity of the PB segments 10–19. Unfortunately, none of these catalysts are able to effectively control the stereoregularity of the PS segments.…”

Section: Introductionmentioning

confidence: 99%

Stereospecific sequential block copolymerizations of styrene and 1,3‐butadiene with a C₅Me₅TiMe₃/B(C₆F₅)₃/Al(oct)₃ catalyst

Tsunogae¹,

Shiono

2005

J. Polym. Sci. A Polym. Chem.

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This article reports a new methodology for preparing highly stereoregular styrene (ST)/1,3-butadiene (BD) block copolymers, composed of syndiotactic polystyrene (syn-PS) segments chemically bonded with cis-polybutadiene (cis-PB) segments, through a stereospecific sequential block copolymerization of ST with BD in the presence of a C 5 Me 5 TiMe 3 /B(C 6 F 5 ) 3 /Al(oct) 3 catalyst. The first polymerization step, conducted in toluene at Ϫ25°C, was attributed to the syndiospecific living polymerization of ST. The second step, conducted at Ϫ40°C, was attributed to the cis-specific living polymerization of BD. The livingness of the whole polymerization system was confirmed through a linear increase in the weight-average molecular weights of the copolymers versus the polymer yields in both steps, whereas the molar mass distributions remained constant. The profound cross reactivity of the styrenic-end-group active species with BD toward ST led to the production of syn-PS-b-cis-PB copolymers with extremely high block efficiencies. Because of the presence of crystallizable syn-PS segments, this copolymer exhibited high melting temperatures (up to 270°C), which were remarkably different from those of the corresponding anionic ST-BD copolymers, for which no melting temperatures were observed. Scanning electron microscopy pictures of a binary syn-PS/cis-PB blend with or without the addition of the syn-PS-b-cis-PB copolymers proved that it could be used as an effective compatibilizer for noncompatibilized syn-PS/cis-PB binary blends.

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“…The copolymerization of St and Bd was also investigated with lanthanide‐based catalysts,6–11 metallocene catalysts,12, 13 and nonmetallocene transition metal catalysts 14–16. The products obtained from copolymerization with these catalysts mainly consisted of 1,4‐ cis units in the copolymer.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of high molecular weight copolymer of styrene and butadiene bearing high 1,4‐cis butadiene unit from copolymerization with CpTiCl₃/methylaluminoxane catalyst

Nakamura

Yamaguchi

Endo

2003

J of Applied Polymer Sci

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Copolymerization of styrene (St) and butadiene (Bd) with CpTiCl 3 /methylaluminoxane (MAO) catalyst in the presence or absence of chloranil (CA) was investigated. The CpTiCl 3 /MAO catalyst showed a high activity for the copolymerization of St with Bd. The 1,4-cis contents in the Bd units for the copolymerization of St and Bd with the CpTiCl 3 /MAO catalyst was observed, and the 1,4-cis content was optimum at a MAO/Ti mole ratio of around 225. The effect of the polymerization temperature on the copolymerization was noted, as was the effect of the 1,4-cis microstructure in the Bd units for the copolymerization of St and Bd. The addition of CA to the CpTiCl 3 /MAO catalyst was found to influence the molecular weight of the copolymer. The high weight-average molecular weight copolymer (M w ϭ ca. 50 ϫ 10 4 ) consisting of mainly a 1,4-cis microstructure of Bd units (1,4-cis ϭ 80.0%) was obtained from the copolymerization with the CpTiCl 3 /MAO catalyst in the presence of CA (CA/Ti mole ratio ϭ 1) at 0°C.

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Copolymerization of styrene and butadiene with Co(acac)3-methylaluminoxane catalyst

Cited by 8 publications

References 11 publications

Progress in Development of Catalyst Systems for Coordinated Polymerization of Olefins

Progress in Development of Catalyst Systems for Coordinated Polymerization of Olefins

Stereospecific sequential block copolymerizations of styrene and 1,3‐butadiene with a C₅Me₅TiMe₃/B(C₆F₅)₃/Al(oct)₃ catalyst

Synthesis of high molecular weight copolymer of styrene and butadiene bearing high 1,4‐cis butadiene unit from copolymerization with CpTiCl₃/methylaluminoxane catalyst

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Copolymerization of styrene and butadiene with Co(acac)3-methylaluminoxane catalyst

Cited by 8 publications

References 11 publications

Progress in Development of Catalyst Systems for Coordinated Polymerization of Olefins

Progress in Development of Catalyst Systems for Coordinated Polymerization of Olefins

Stereospecific sequential block copolymerizations of styrene and 1,3‐butadiene with a C5Me5TiMe3/B(C6F5)3/Al(oct)3 catalyst

Synthesis of high molecular weight copolymer of styrene and butadiene bearing high 1,4‐cis butadiene unit from copolymerization with CpTiCl3/methylaluminoxane catalyst

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Stereospecific sequential block copolymerizations of styrene and 1,3‐butadiene with a C₅Me₅TiMe₃/B(C₆F₅)₃/Al(oct)₃ catalyst

Synthesis of high molecular weight copolymer of styrene and butadiene bearing high 1,4‐cis butadiene unit from copolymerization with CpTiCl₃/methylaluminoxane catalyst