Showing papers by "Wang Zhang Yuan published in 2006"
TL;DR: In this article, a group of pyrene-containing poly(phenylacetylene)s (PPAs) with high molecular weight (Mw up to ∼170 000) were synthesized in high yields (up to ∼96%).
Abstract: A group of pyrene-containing poly(phenylacetylene)s (PPAs) with high molecular weight (Mw up to ∼170 000) were synthesized in high yields (up to ∼96%). Simply mixing the polymers and multiwalled carbon nanotubes (MWNTs) in an appropriate solvent afforded the polymer/MWNT hybrids with MWNT contents up to ∼25 wt %, which are soluble in common organic solvents such as chloroform and THF. The solubility can be as high as 637.5 mg/L in THF, thanks to the “additive effect” of the PPA skeleton and the pyrene pendants in solubilizing the MWNTs. The solubilization is realized through the spontaneous wrapping of the polymer chains round the MWNT shells, which is driving by the favorable π−π interactions of the PPA skeleton and the pyrene rings with the MWNT walls. The P2(5)/MWNT hybrid is thermally stable, losing little of its weight when heated to 338 °C. The P2(m)/MWNT hybrids are electronically more conjugated and emit blue-green light more efficiently than their parent polymers upon photoexcitation. The surface...
158 citations
41 citations
TL;DR: The emissions of P9 and P9/H12 were enhanced and weakened, respectively, proving that the inorganic perovskite framework works as a photocatalyst for accelerating the bleaching process of the conjugated PA chains.
Abstract: A highly photoresponsive perovskite hybrid containing an electroactive organic component (H1) was fabricated. A disubstituted polyacetylene (PA) with a hidden amino functionality (P3) was synthesized, hydrolysis and quaternization of which afforded the desired PA ammonium salt (P5). Mixing P5 with lead bromide readily yielded H1, which was stable, soluble, and film-forming. The inorganic framework induced the polymer chains to align in an ordered fashion, which helped to populate the chain segments with long conjugation lengths. The hybrid emitted a blue light (457 nm) in a high quantum yield (62%), thanks to the enhanced electronic conjugation, the weakened interaction between the layer-segregated chains, and the efficient energy transfer from the inorganic sheets to the organic layers. P3 exhibited a half-discharge time as short as ∼0.7 s, representing the first example of an efficient photoconductive disubstituted PA. While stable to normal light illumination, H1 was rapidly bleached upon exposure to h...
41 citations
TL;DR: A polystyrene (PS)/nanosilica organic-inorganic hybrid material was prepared from styrene monomer and commercial aqueous silica sol containing large amounts of Si-OH by means of emulsion polymerization as discussed by the authors.
18 citations