Copolymerization of styrene with(Z)-1,3-pentadiene in the presence of a syndiotactic-specific catalyst

Longo, Pasquale; Proto, Antonio; Oliva, Patrizia; Sessa, Irene; Zambelli, Adolfo

doi:10.1002/(sici)1099-0518(19970930)35:13<2697::aid-pola14>3.0.co;2-6

Cited by 17 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fig. 2 shows the 1 H and 13 C NMR spectra of the resulting polymer after ozonolysis of poly(SIPM). In the 1 H NMR spectrum, narrow and sharp peaks of the methine and methylene group based on styrene units of the main chain were observed, which may be attributed to the syndiotactic polystyrene sequences.…”

Section: Resultsmentioning

confidence: 99%

“…Polymerization of the SIPM with CpTiCl 3 -MAO as the catalyst was found to proceed readily to give a high molecular weight polymer. 1 H and 13 C NMR spectra of the poly(SIPM) after ozonolysis of the isoprene side chain revealed that poly(SIPM) is a highly syndiotactic polymer. Syndiotactic poly(SIPM) is soluble in usual solvents in spite of having highly syndiotactic sequences on its main chain and a considerable degree of polymerization.…”

Section: Communicationmentioning

confidence: 99%

“…Actually, metallocene catalysts were reported to be capable of introducing long-chain branches in copolymerizations of olefins and to afford long-chain branched comonomers. [10][11][12][13] Previously, we reported that highly syndiotactic graft copolymers were synthesized by the copolymerization of St and the macromonomer using CpTiCl 3 -MAO catalyst. [14][15][16] Taking into consideration the reactivity of the macromonomers in the copolymerization with styrene, homopolymerization of the macromonomer will be possible to give stereoregular multi-branched polymers.…”

Section: Introductionmentioning

confidence: 99%

“…(a)1 H and (b)13 C NMR spectra of poly(SIPM) in odichlorobenzene/C 6 D 6 at measured at 120 8C after ozonolysis for 24 h.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Synthesis of a novel syndiotactic poly(macromonomer) consisting of styrene-terminated polyisoprene macromonomers using half-titanocene catalysts

Senoo

Endo²

2000

Macromol. Rapid Commun.

View full text Add to dashboard Cite

Methanetrisphosphonic acids provide a branch point for synthetic nucleotide analogues which can be exploited either to generate novel tripodal nucleotides or to incorporate additional negative charge into linear analogues relative to the parent nucleotide, as exemplified in the picture for ATP and diadenosine tetraphosphate (Ap4A). These compounds show valuable discriminatory behavior as competitive inhibitors for the tumor suppressor protein Fhit and a second ApnA pyrophosphohydrolase. X=H, Cl, F.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Communicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…(a)1 H and (b)13 C NMR spectra of poly(SIPM) in odichlorobenzene/C 6 D 6 at measured at 120 8C after ozonolysis for 24 h.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of a novel syndiotactic poly(macromonomer) consisting of styrene-terminated polyisoprene macromonomers using half-titanocene catalysts

Senoo

Endo²

2000

Macromol. Rapid Commun.

View full text Add to dashboard Cite

show abstract

Efficiencies of various metallocene/reducing agent catalyst systems in the hydrogenation of polystyrene-b-polybutadiene-b-polystyrene block copolymers

Yang

Hsieh

Tsiang

1999

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

Various metallocenes, including bis( 5 -cyclopentadienyl)cobalt, bis( 5 -cyclopentadienyl)nickel, and bis( 5 -cyclopentadienyl)titanium dichloride, combined with various reducing agents, including n-butyllithium, phenyllithium, and triethylaluminum, have been evaluated for their catalytic efficiencies in the hydrogenation of polystyrene-b-polybutadiene-b-polystyrene (SBS) block copolymer. The efficiencies were determined by monitoring the extent of saturation of double bonds on the polybutadiene segment of the copolymer using FTIR and 1 H-NMR spectroscopy. The cobaltocene/nbutyllithium catalyst system was found the most active. The effects of H 2 pressure and the ratio of n-butyllithium to cobaltocene ratio on the hydrogenation efficiency were also investigated.

show abstract

Catalytic systems Me2SiCp*NtBuMX2/(CPh3)(B(C6F5)4) (M?Ti, X?CH3, M?Zr, X?iBu) in copolymerization of ethylene with styrene

Sukhova

Панин

Babkina

et al. 1999

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

Catalytic activity of Me2SiCp*NtBuMX2/(CPh3)(B(C6F5)4) [MTi, XCH3 (1); MZr, X=iBu (2)] systems in the ethylene/styrene (E/S) feed was examined. Experimental data revealed high activity for the catalytic system (1) for copolymerization ethylene with styrene, whereas the system with enhanced catalytic activity for ethylene homopolymerization (2) was temporarily blocked in the styrene presence yielding, even at high styrene content, homopolyethylene as the final product. Properties of thus obtained polymers were analyzed. Catalytic system (1) occurred very sensitive to S/E ratio in the comonomers feed. The 10‐fold acceleration for ethylene consumption was shown in two experimental sets conducted at S/E = 1.3 ratio, 1 bar, and 7.5 bar ethylene pressure, respectively. The consequent enhancement in S/E ratio resulted in slowing down both ethylene consumption and catalyst deactivation rates. Atactic polystyrene was formed at high styrene content with the catalyst (1). Catalytic system (1) allowed design of products with the highest styrene content (20 mol %) at low ethylene pressure, moderate temperature, and high S/E ratio. The apparent activation energy estimated from the initial rates of ethylene consumption was 54.6 kJ/mol. Analysis of apparent reactivity factors (rE = 9 and rS = 0.04; rE × rS = 0.4) and 13C‐NMR copolymer spectra revealed an alternating tendency of the comonomers for active center incorporation. DSC measurements showed considerable decrease of melting points and crystallinity even for copolymers with low styrene content. The catalyst produced relatively high–molecular weight copolymers (140–150 kg/mol) even at 80°C. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 1083–1093, 1999

show abstract

Copolymerization of styrene with(Z)-1,3-pentadiene in the presence of a syndiotactic-specific catalyst

Cited by 17 publications

References 2 publications

Synthesis of a novel syndiotactic poly(macromonomer) consisting of styrene-terminated polyisoprene macromonomers using half-titanocene catalysts

Synthesis of a novel syndiotactic poly(macromonomer) consisting of styrene-terminated polyisoprene macromonomers using half-titanocene catalysts

Efficiencies of various metallocene/reducing agent catalyst systems in the hydrogenation of polystyrene-b-polybutadiene-b-polystyrene block copolymers

Catalytic systems Me2SiCp*NtBuMX2/(CPh3)(B(C6F5)4) (M?Ti, X?CH3, M?Zr, X?iBu) in copolymerization of ethylene with styrene

Contact Info

Product

Resources

About