Study of Heterogeneity of Ethylene/1-Octene Copolymers Synthesized with Zirconium and Titanium Complexes Bearing Diamine-bis(phenolate) Ligands.

A series of ethylene/1-octene copolymers synthesized with diamine-bis(phenolate) complexes activated with Al(Bu)/[PhC][B(CF)] were subjected to preparative temperature rising elution fractionation (TREF). The complexes used differed in the type of metallic center (Zr or Ti) or the amine donor in the pendant arm of the ligand (NMe or NPr). The obtained fractions were then characterized via FTIR, DSC and GPC methods.

Titanium and Vanadium Complexes of Tridentate Phenoxy-Imine and Phenoxy-Amine Ligands and Their Application in the Ring-Opening Polymerization of Cyclic Esters.

Phenoxy-imine and phenoxy-amine proligands, with the additional OH donor groups 2,4-Bu-6-(2-CH(OH)-CHN=CH)CHOH (), 6-(2-CH(OH)-CHN=CH)CHOH (), and 2,4-Bu-6-(2-CH(OH)-CHNH-CH)CHOH (), were synthesized and their titanium (-) and vanadium (-) complexes were prepared in reactions with Ti(OPr) and VO(OPr), respectively. All new compounds were characterized with the use of FTIR, H, and C NMR spectroscopy; X-ray crystallography was also used to study proligands. All the complexes proved to be active catalysts in the ring-opening polymerization (ROP) of -caprolactone, -lactide, and -lactide in the melt.

Application of Silsesquioxanes in the Preparation of Polyolefin-Based Materials.

This paper is a review of studies on the use of the polyhedral oligomeric silsesquioxanes (POSS) of various structures in the synthesis of polyolefins and the modification of their properties, namely: (1) components of organometallic catalytic systems for the polymerization of olefins, (2) comonomers in the copolymerization with ethylene, and (3) fillers in composites based on polyolefins. In addition, studies on the use of new silicon compounds, i.e.

Copolymerization of Ethylene with Selected Vinyl Monomers Catalyzed by Group 4 Metal and Vanadium Complexes with Multidentate Ligands: A Short Review.

This paper gives a short overview of homogeneous post-metallocene catalysts based on group 4 metal and vanadium complexes bearing multidentate ligands. It summarizes the catalytic behavior of those catalysts in copolymerization of ethylene with 1-olefins, with styrenic monomers and with α,ω-alkenols. The review is focused on finding correlations between the structure of a complex, its catalyst activity and comonomer incorporation ability, as well as the microstructure of the copolymer chains.

2,4-Di-tert-butyl-6-({[2-(di-methyl-amino)-eth-yl](2-hy-droxy-benz-yl)amino}-meth-yl)phenol.

The title compound, C26H40N2O2, has both its N atoms in trigonal-pyramidal geometries. The mol-ecular structure is stabilized by O-H⋯N and C-H⋯O hydrogen bonds. In the crystal, C-H⋯π inter-actions lead to the formation of a supramolecular helical chain along the b-axis direction.