Synthesis and electroluminescent properties of polyfluorene-based conjugated polymers containing bipolar groups

Highly fluorescent purine-containing conjugated copolymers with tailored optoelectronic properties

Conjugated copolymers containing electron donor and acceptor units in their main chain have emerged as promising materials for organic electronic devices due to their tunable optoelectronic properties.

2-(Naphthalen-2-yl-oxy)-N'-[2-(naphthalen-2-yl-oxy)acet-yl]acetohydrazide monohydrate

The title compound, C24H20N2O4·H2O, crystallizes with half a mol-ecule of 2-(naphthalen-2-yl-oxy)-N'-[2-(naphthalen-2-yl-oxy)acet-yl]acetohydrazide and half a water mol-ecule in the asymmetric unit. In the crystal, mol-ecules form planes parallel to (011). Two mol-ecules are connected by water mol-ecules via O-H⋯O and N-H⋯O hydrogen bonds.

Hydroxyl functionalized polytriazole-co-polyoxadiazole as substrates for forward osmosis membranes

Hydroxyl functionalized polytriazole-co-polyoxadiazole (PTA-POD) copolymers have been synthesized and cast as promising highly thermally stable, chemically resistant, and antiorganic/biological fouling porous substrates for the fabrication of thin-film composite (TFC) forward osmosis (FO) membranes. The roles of PTA/POD ratios in the membrane substrates, TFC layers, and FO membrane performance have been investigated. This study demonstrates that the substrate fabricated from the copolymer containing 40 mol % PTA is optimal for the TFC membranes. Compared to the POD-TFC membrane, the 40 mol % PTA-TFC membrane exhibits a remarkable decrease in structural parameter (S) of more than 3.3 times. In addition, the 40 mol % PTA-TFC membrane is characterized by high water fluxes of 24.9 LMH and 47.2 LMH using 1 M NaCl as the draw solution and DI water as the feed under FO and pressure retarded osmosis (PRO) modes, respectively. Compared to a polysulfone (PSU) supported TFC-FO membrane under similar fabrication conditions, the 40% mol PTA-TFC membrane shows better FO performance and enhanced antifouling properties on the support (lower protein binding propensity and improved bacterial inhibition). Moreover, the performance of the 40 mol % PTA supported TFC-FO membrane can be improved to 37.5 LMH (FO mode)/78.4 LMH (PRO mode) and potentially higher by optimizing the support morphology, the TFC formation, and the post-treatment process. Hence, the use of newly developed hydroxyl functionalized polytriazole-co-polyoxadiazole copolymers may open up a new class of material for FO processes.

Crosslinked copolyazoles with a zwitterionic structure for organic solvent resistant membranes

Cross-linking of hydroxyl modified polytriazoles.