TUNGSTEN ARİLOKSİT KOMPLEKSİNİN MODİFİYE EDİLMİŞ PS-DVB MİKROKÜRELERİNE İMMOBİLİZASYONU VE OLEFİNLERİN HALKA AÇILIM METATEZ POLİMERİZASYONUNA UYGULANMASI
Özet
In this study, W(O-2,6-C6H3Cl2)2Cl4 catalyst, a tungsten aryloxide complex, was attached to the polystyrene-divinylbenzene (polystyrene-divinylbenzene, PS-DVB) microspheres containing amine functional group by the immobilization method described in the literature. The catalyst was used both in the free state and in the metathesis polymerization of olefin ring-opening as attached to the polymer support. The ring opening metathesis polymerization (ROMP) of cycloheptene, cyclooctene, norbornene and dicyclopentadiene olefins was carried out with W(O-2,6-C6H3Cl2)2Cl4 catalyst supported PS-DVB for the first time.
ROMP experiments with free and supported catalyst were performed simultaneously and the results of the analyzes are presented comparatively. Experiments were conducted at constant temperature (85 °C) and Bu4Sn cocatalyst was used to activate the catalysts.
Monomers have been investigated in 3 groups, monocyclic olefins, bicyclic olefins and tricyclic olefins. The characterizations of the polymers obtained from ROMP were determined by fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), thermal gravimetric analysis Gel permeation chromatography (GPC).
The stereostructure was determined by microstructure analysis with the help of 13C-NMR spectra. As a result of these analyzes it was observed that the polymeric products contained large amounts of trans double bonds. The immobilization of the catalyst to the support material has little effect on the stereoselectivity and the geometric structure of the product. However, the catalytic efficiency of separating the catalyst have shown very favorable catalytic performance at the edges.
