Macromol. Rapid Commun. 16/2007

Abstract

Cover: A cationic water-soluble polyfluorene with excellent solubility and high PL quantum yield in water has been prepared. The high cationic density and appropriate side chain length of the polymer are the key factors to achieve such high water solubility. Further details can be found in the article

Comparison of the performances of single cell solid oxide fuel cell stacks with Ni/8YSZ and Ni/10CGO anodes with H2S containing fuel

“…(8). With 40 AE 0.2 L h À1 total fuel volume flow under ideal gas conditions, the H 2 S molar volume flow rates can be calculated.…”

“…With relatively high pH 2 S (in their case 20 ppm) further chemisorption of sulfur on nickel leads the oxidation of nickel at triple phase boundaries with oxygen ion flux from cathode and thus a further increase in anodic polarization and larger cell voltage loss. Wang et al [8] tested the cells with 2e50 ppm H 2 S with 50% H 2 /1.5%H 2 O/ 48.5%N 2 fuel. With 2 ppm H 2 S the initial cell voltage drop was 12.67% in 4 min.…”

Cationic polyfluorenes for intracellular delivery of proteins

“…Our early studies showed that only the quaternary ammonium system 1 was water soluble; corresponding primary amine, secondary N -methylamine, and tertiary N , N -dimethyl amines polymers were all surprisingly insoluble in aqueous media, even at reduced pHs. However, the quaternary salt 1 , very similar to a known material, 25 gave a clear solution in water even at neutral pH. Consequently we made a batch of this material via a modification of the literature procedure 25 that involved similar steps but in a different order (see ESI†).…”

Design and Synthesis of Conjugated Polyelectrolytes

“…To obtain cationic polyfluorene homopolymers, the dioxaborolane monomer, 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9 -bis [3-(N,N-dimethylamino) propyl]fluorene (39), was synthesized by reacting 38 with 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane in the presence of n-BuLi (Scheme 1.19) [23]. The Suzuki polymerization between 38 and 39 and subsequent treatment with bromoethane led to the cationic homopolymer P54 with good water solubility.…”