Synthesis and optical properties of organic-inorganic hybrid semi-interpenetrating polymer network gels containing polyfluorenes

Abstract

Organic-inorganic hybrid semi-interpenetrating polymer network (semi-IPN) gels containing polyfluorenes (PFs) are synthesized by hydrosilylation reaction of joint and rod molecules in toluene, where PFs are poly(9,9-dihexylfluorene-2,7-diyl) (PF6) or, poly(9,9-dioctylfluorene-2,7-diyl) (PF8), joint molecules are 1,3,5,7-tetramethylcyclotetrasiloxane (TMCTS), or 1, 3,5,7,9,11,13,15-octakis(dimethylsilyloxy)pentacyclo-[9,5,1,1,1, 1]octasilsesquioxane (POSS), and rod molecules are 1,5-hexadiene (HD) or 1,9-decadiene (DD). The semi-IPN gels containing low molecular weight PF6 show higher photoluminescence efficiency (/ g ) than the toluene solution of PF6L (/ s ). The semi-IPN gels composed of long rod molecule of DD and cubic joint molecule of POSS show the most effective increase in the emission intensity. The emission intensity of PF6L increases as formation of the network in the POSS-DD semi-IPN gel. The POSS-DD semi-IPN gels containing high molecular weight PF6 and PF8 also show the increase of emission intensity than those of the toluene solutions. The semi-IPN synthesized in cyclohexane show syneresis and phase separation between network structure and PF chains. The semi-IPN gels containing PF8 show emission peaks at 450 and 470 nm derived from b-sheet structure of PF8. A systematic study clears correlation between emission property and network structure and/or composition of semi-IPN gels. The semi-IPN gels provide emissive self-standing soft materials with high efficiency and in a narrow wavelength range emission.

Synthesis and properties of σ‐π conjugated porous polymers obtained withMizoroki–Heckreaction of tetra vinyl cyclic siloxane with dibromo fluorene

“…Poly(9,9‐di‐ n ‐hexyl fluorene‐2,7‐diyl) solutions with high concentration show clear concentration quenching. [ 23 ] One explanation of the present results is that the concentration quenching, which would be occurred in the solution state before phase separation in the resection system, should reflect to the emission of the resulting porous polymers.…”

Synthesis and properties of broad-band absorption POSS-based hybrids

“…In the application of organic optical materials, the previous studies mainly focused the fluorescent properties of POSS based hybrids [24]. Naga et al dispersed the dyes in the POSS based gel network, resulting with an increase of fluorescent quantum efficiency [25,26]. Besides the physical separation of dyes, the incorporation of POSS into the conjugated polymers via covalent bonding, either in the core, ends or the side chains [27e29], was also found to effectively prevent the aggregation and improve the fluorescent properties, especially in the solid state.…”

Suzuki-Miyaura Coupling Polymerization: Synthesis, Characterization and Optical Properties

“…In addition, the polythiazole structures were an important class of the conjugated polymers (Wilson et al, 2015, Zhang et al, 2016, and the polymers having fluorene moiety has increasingly been received attention in the literature due to their industrial applications (Sui et al, 2014, Hu et al, 2016. Polyfluorene materials were also played a significant role in the material science due to their optoelectronic properties and biophotonics applications (Naga et al, 2014, Xiang et al, 2017.…”