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Inne
The influence of cocatalysts on phenylacetylene oligo-and polymerization.
Autorzy
Rok wydania
2004
Czasopismo
Journal of Molecular Catalysis A-Chemical
Numer woluminu
224
Strony
93-96
DOI
10.1016/j.molcata.2004.06.033
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Titanium bisphenolate complexes [Ti(edbp)Cl2] (1), [Ti2(μ-OEt)2(edbp)2(OEt)2] (2) and [Ti2(μ-OMe)2(edbp)2(Me)2] (3) (edbpH2 = 2,2′-ethylidenebis(4,6-di-tert-butylphenol) combined with trialkyl aluminium AlR3 (R = Me, Et, iBu) activators induce phenylacetylene (PA) oligo- and/or polymerization. It was found that the catalytic activity and products formation depend strongly on the used cocatalyst. The 1/AlEt3 catalyst has the highest activity and selectivity (96% conversion; 98% trans-PPA). The PPA has low Mn values (2200) and PDI exceeding 1.04. Instead, 1/AliBu3 produces only cyclotrimers. Polymer formed by 2/AlEt3 possesses lower polydispersion index (PDI values 2.5) but high molecular weight (Mn ca. 13 × 103) and was the mixture of cis and trans stereoisomers of PPA. The compound 3 containing terminal methyl groups was unable to promote PA polymerization in absence of activators, only cyclotrimerization products (10% conversion) were formed.
Słowa kluczowe
Polymerization, Cyclotrimerization, Acetylenes, Titanium, Bisphenolate complexes
Adres publiczny
https://doi.org/10.1016/j.molcata.2004.06.033
Strona internetowa wydawcy
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