Optically active amphiphilic hyperbranched polyglycerols as templates for palladium nanoparticles

Abstract We report a systematic study on the encapsulation of palladium nanoparticles in optically active amphiphilic hyperbranched polyglycerols with different optical signs and different degrees of polymerization, namely (−)-P(G 40 C16 0.5 ) 1 and (+)-P(G 73 C16 0.5 ) 2 . Several issues have been addressed here: (a) relatively wide size distributions (1–5 nm) of palladium nanoparticles have been achieved, (b) a remarkable template effect ( 1 , DP n  = 40, 1.2 ± 0.1 nm; 2 , DP n  = 73, 2.3 ± 0.1 nm average particle size) has been observed using TEM technique, as shown by the particle size dependent on the degree of polymerization of the polymers, (c) NaBH 4 is found to be a convenient redu…

Synthesis and Supramolecular Association of Immobilized NCN-Pincer Platinum(II) Complexes on Hyperbranched Polyglycerol Supports

Pertosylation of hyperbranched polyglycerol (M(n)=2000; M(w)/M(n)=1.3) followed by partial displacement of the tosyl groups with carboxylic acid functionalized NCN-pincer platinum(II) complexes [PtI-2,6-(NMe(2)CH(2))(2)C(6)H(2)-4-COOH], resulted in covalent attachment of the NCN-pincer complexes to the polyglycerol. These functionalized hyperbranched macromolecules have been characterized by (1)H, (13)C, and (195)Pt NMR, UV-visible, and IR spectroscopy. The presence of Pt and I atoms renders them directly visible by transmission electron microscopy (TEM) without staining procedures, which offers images of associated hyperbranched macromolecules. TEM micrographs show disk-shaped structures w…

A convenient approach to amphiphilic hyperbranched polymers with thioether shell for the preparation and stabilization of coinage metal (Cu, Ag, Au) nanoparticles

Miscibility and properties of linear poly(l-lactide)/branched poly(l-lactide) copolyester blends

Abstract Polymer blends consisting of linear poly( l -lactide) (PLLA) and different proportions of dendritic PLLA-based copolyesters ( hb -PLLA) characterized by different degrees of branching (DB) were obtained in melt. The solid-state properties of poly( l -lactide)s and their blends were investigated by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), atomic force microscopy (AFM) and stress–strain measurements. DSC and DMA methods proved miscibility of PLLA/ hb -PLLA blends for the studied composition range. AFM indicated that no phase separation occurs in PLLA/ hb -PLLA blends and that PLLA and hb -PLLA cocrystallize in one single lamellae type. The mechanica…