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Biomimic hyaluronic acid (HA) prodrug micelles with pH and reduction responsiveness were prepared by chemical graft of phosphorylcholine and doxorubicin (DOX) to the backbone of HA. DOX was conjugated to HA by pH-sensitive hydrazone bonds which could be hydrolyzed under acidic conditions and thus resulted in controlled release of DOX. Besides, the HA prodrug micelles were cross-linked via reduction-responsive...
Creating patterns of biomolecules and cells through precise surface engineering has offered the potentials for cancer-related studies, cellular bioassays, and drug screening because of the regulated cellular functions via the cell-substrate interactions. It is desirable in the basic laboratories with limited facilities to make the patterned surfaces by a template-free, low-cost, and high-throughput...
A self-cross-linkable poly(ethylene terephthalate) block copolyester (SSP-PETPx) has been synthesized via solid-state polymerization (SSP). In the SSP process, a cross-linkable monomer named 4-(phenylethynyl) di(ethylene glycol) phthalate (PEPE) is incorporated into the amorphous phase of PET. The sequence distribution of the resulted copolyester SSP-PETPx is analyzed with 1H NMR, showing that the...
Flame-retardant-free and thermo-cross-linkable copolyesters have been synthesized, and their flame retardation and anti-dripping behavior as a consequence of cross-linking during combustion were investigated in detail. TG-DSC simultaneous thermal analysis, rheological analysis, and TGA established the extent and rate of the cross-linking reaction. The extent of cross-linking depends on the content...
We report the preparation of highly charged nanocomposites comprised of water-soluble, anionic fullerene and cationic poly-phenylenevinylene (PPV) derivatives. The nanocomposites display high fluorescence quenching efficiency (99%) presumably due to enhanced miscibility between cationic PPV and anionic C 60 via electrostatic interactions. We show that complexation between the cationic PPV...
Two water soluble conjugated polymers, poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and ammonium ion stabilized poly(phenylene vinylene) (P2), are found to be able to reduce noble metal ions to zero-valent metals via a direct chemical deposition technique. Au nanoparticle clusters can be obtained through reduction of Au 3+ ions by PEDOT:PSS and the electronic coupling...
The series of trichlorotitanium 2-(2-pyridinyliminomethyl)phenolates, [4,6-tBu 2 C 6 H 2 O-2–CHNC 5 R 1–4 N]TiCl 3 (R 1–4 = H (1); R 1,3,4 = H, R 2 = Me (2); R 1,2,4 = H, R 3 = Me (3); R 2,4 = H, R 1,3 = Me (4); R 1,3 = H, R 2 = CF 3 , R 4 = Cl (5)), were...
We report here the preparation of nanostructured polypyrroles (PPys) with different morphologies (nanospherical or nanofibrillar) through a surfactant-assisted oxidative polymerization route. Nanofibrillar PPy has a higher redox current, presumably due to a higher surface area accessible to the electrolytes and a lower charge transfer resistance compared to that of the spherical PPy. The impedance...
Non-conjugated polyelectrolytes were used to quench oppositely charged fluorescent dye–ligand conjugate (DLC) molecules by bringing them to the vicinity of the polyelectrolyte backbone to form aggregates and hence quench the dye fluorescence. As target protein molecules are added to the solution, the specific interaction between the DLC and the protein disrupts the aggregate structure, thus recovering...
We report here detailed investigation into optimizing the synthesis of chiral polyaniline nanofibers using an oligomer-assisted route. The effect of temperature, monomer concentration, nature of oligomer, and the rate of oxidant addition on the optical properties of the PANI nanofibers have been carefully determined. Our results indicate that the highest chirality is achieved under conditions that...
We report a simple method to synthesize Ag, Au, and Pt nanoparticles with a reasonable size dispersity using water-dispersible conducting polymer colloids composed of polyaniline (PANI) and conventional polyelectrolyte. This facile synthesis results in single crystalline metal nanoparticles that are stable in an aqueous solution for at least several weeks. The process involves incrementally adding...
Thin films of alternating layer composition were constructed from the polyelectrolyte complex PEDOT:PSS and the polycation PEI, using ionic self assembly (ISA). The PEI/PEDOT:PSS system displays a consistent trend in film growth, as evidenced by UV–visible spectroscopy and ellipsometry. We find that the overall density of PEDOT increases with increasing number of layers. The density of PSS during...
We report here the fabrication and characterization of novel, monolithic electrochemical actuators based on polyaniline (PANI) and a micrometer-sized graphite powder. These PANI-graphite thin films have a graphite-rich layer that renders composite thin film conductive at all redox states. The asymmetric distribution of graphite also allows for a bending movement as the films are subjected to electrochemical...
A rigid spiro aromatic dicyanate, 6,6 -dicyanato-3,3,3 ,3 -tetramethyl-1,1 -spirobi-indane (DCSI), was synthesized and its polycyclotrimerization investigated. The critical gel point (α gel ) during polycyclotrimerization of DCSI was studied by gravimetric analysis. The resulting value of α gel (= 65 ± 2%) deviates greatly from the theoretical value of 50%...
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