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In this work, extremely high molecular weight (Mw) poly(allylamine hydrochloride) (PAH, 900K g/mol) and poly(acrylic acid) (PAA, 225 K g/mol) were selected to amplify the difference in the growth of multilayers in comparison with low Mw PAA (15K g/mol) and PAH (15K g/mol). By varying the pH conditions, the PAH/PAA multilayers were fabricated via the layer-by-layer (LbL) assembly in both linear and...
Surface tethered polyelectrolyte brushes are scientifically interesting and technologically relevant to many applications, ranging from colloidal stabilization to responsive and tunable materials to lubrication. Many applications operate in environments containing multi-valent ions, media in which our scientific understanding is not yet well-developed. We synthesized high-density polystyrene sulfonate...
Several non-metallocene-type titanium(IV) complexes containing phenoxy-phosphine or thiophenoxy-phosphine ligands of type, (2-R 1 -4-R 2 -6-PPh 2 -C 6 H 2 X) 2 TiCl 2 (2a: X = O, R 1 = R 2 = t-Bu; 2b: X = O, R 1 = R 2 = cumyl; 2c: X = S, R 1 = SiMe 3 , R 2 = H) have been synthesized...
A series of novel half-metallocene-type titanium complexes CpTiCl 2 [PhNC(R 2 )CHC(R 1 )O] (2a, R 1 = Cy, R 2 = CF 3 ; 2b, R 1 = t Bu, R 2 = CF 3 ; 2c, R 1 = Ph, R 2 = CF 3 ; 2d, R 1 = Ph, R 2 = CH 3 ) have been synthesized by treating CpTiCl 3 with the corresponding...
The copolymerizations of ethylene with polar hydroxyl monomers such as 10-undecen-1-ol, 5-hexen-1-ol and 3-buten-1-ol were investigated by the vanadium(III) catalysts bearing bidentate [N,O] ligands (1, [PhNC(CH 3 )CHC(Ph)O]VCl 2 (THF) 2 ; 2, [PhNCHC 6 H 4 O]VCl 2 (THF) 2 ; 3, [PhNCHC(Ph)CHO]VCl 2 (THF) 2 ). The polar monomers...
The crystallization of poly(ɛ-caprolactone)–poly(ethylene oxide)–poly(ɛ-caprolactone) (PCL–PEO–PCL) triblock copolymer was studied using FTIR and 2D FTIR spectroscopies. The weight ratio of PCL/PEO in the investigated sample was about 20:1. Although it is such a low amount of PEO that it cannot form any crystals, the PEO block undergoes some structural change in the cooling process. It was established...
Fe(II) pyridinebisimine complexes activated with trialkylaluminium or modified methylaluminoxane (MMAO) as catalysts were employed for the polymerization of methyl methacrylate. Polymer yields, activities and polymer molecular weights as well as molecular weight distributions can be controlled over a wide range by the variation of the structures of the Fe(II) pyridinebisimine complexes and the reaction...
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