- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Polysiloxane-based Hyperbranched Fluorescent Materials Prepared by Thiol-ene “Click” Chemistry as Potential Cellular Imaging Polymers
摘要： Hyperbranched polymers have attracted increasing interest due to their unique properties which possess excellent RI and thermal stability, and have been widely used in fields of drug delivery, catalysts, liquid crystal and so on. Herein, polysiloxane-based hyperbranched fluorescent materials (P1 and P2) were synthesized by thiol-ene “click” chemistry. Then, novel polysiloxane-based hyperbranched fluorescent materials (P1-Ln3+) has been prepared by rare earth ions coordination. In view of the splendid fluorescence characteristics and favorable stability of P1-Ln3+, it has been applied in biological imaging. P1-Ln3+ has gained commendable applications in bioimaging.
关键词： Fluorescence materials,Living cells imaging,Hyperbranched polymers,Thiol-ene "click" chemistry,Coordination,Rare earth ions
更新于2025-09-23 15:23:52
-
Unprecedented Multicolor Photoluminescence from Hyperbranched Poly(amino ester)s
摘要： A novel kind of water-soluble fluorescent hyperbranched poly(amino ester) (PAE) is prepared through a one-pot polycondensation reaction of citric acid (CA) and N-methyldiethanolamine (NMDEA). The PAE exhibits enhanced and red-shift fluorescence with increasing solution concentration, showing distinct aggregation-induced emission character. Interestingly, the resulting PAE exhibits tunable photoluminescence from blue, cyan, and green to red irradiated by altering the excitation wavelengths. Such unique emission of non-conjugated PAE is attributed to the clustering of ester and tertiary amine groups derived from PAE self-assembly aggregates. Moreover, the fluorescence of PAE is very sensitive to Fe3+ ions. The facile preparation and unique optical features make PAE potentially useful in numerous applications such as multicolor cellular imaging, Fe3+ ions probe, and light-emitting diodes.
关键词： aggregation-induced emission,poly(amino ester)s,water-soluble polymers,hyperbranched,fluorescence
更新于2025-09-23 15:23:52
-
The low resistance and high sensitivity in stretchable electrode assembled by liquid-phase exfoliated graphene
摘要： Flexible electrodes have been extensively investigated to fulfill the development of highly advanced human interaction electronics. It’s still a challenge to develop the conductive film for the scalable device with low resistance under large deformation. In this work, we reported a stretchable conductive layer on elastomer substrates assembled by few-layer graphene, which was exfoliated in the low-boiling organic solvent with assistance of hyperbranched copolymer as stabilizer that was adsorbed on the nanosheets via CH-π non-covalent connections. The relative resistance change of graphene film is 117% as the mechanical strain reaches 35%, which retains high conductivity under tensile operation. The resistance of the graphene electrode is dependent on the overlapping of the nanosheets during the deformation, in which the slipping of nanosheets is due to the lubricant effect of the hyperbranched segments acting as dynamic CH-π interactions. This work highlights a general strategy of the stretchable conductive film for the flexible electronics, and sheds a light on the conduction mechanism for the graphene film during large deformation.
关键词： Stretchable,Graphene,Flexible electrode,Hyperbranched polymer
更新于2025-09-23 15:21:01
-
Synthesis and aggregation of a porphyrin cored hyperbranched polyglycidol and its application as a macromolecular photosensitizer for photodynamic therapy
摘要： Macromolecules are potentially useful delivery systems for cancer drugs as their size allows them to utilize the enhanced permeability and retention effect (EPR), which facilitates selective delivery to (and retention within) tumors. In addition, macromolecular delivery systems can prolong circulation times as well as protecting and solubilizing toxic and hydrophobic drug moieties. Overall these properties and abilities can result in an enhanced therapeutic effect. Photodynamic therapy (PDT) combines the use of oxygen and a photosensitizer (PS), that become toxic upon light-irradiation. We proposed that a PS encapsulated within a water-soluble macromolecule could exploit the EPR effect and safely and selectively deliver the PS to a tumor. In this paper, we describe the synthesis of a porphyrin cored hyperbranched polymer that aggregated into larger micellar structures. DLS and TEM indicated that these aggregated structures had diameters of 45 nm and 20 nm for the solvated and non-solvated species respectively. The porphyrin cored HBP (PC-HBP), along with the non-encapsulated porphyrin (THPP), were screened against EJ bladder carcinoma cells in the dark and light. Both THPP and PC-HBP displayed good toxicity in the light, with LD50 concentrations of 0.5 μM and 1.7 μM respectively. However, in the dark, the non-incorporated porphyrin (THPP) displayed significant toxicity, generating an LD50 of 4 μM. On the other hand, no dark toxicity was observed for the polymer system (PC-HBP) at concentrations of 100 μM or less. As such, incorporation within the large polymer aggregate serves to eliminate dark toxicity, whilst maintaining excellent toxicity when irradiated.
关键词： self-assembly.,hyperbranched polymers,drug delivery,Photodynamic therapy
更新于2025-09-19 17:15:36
-
Photocuring of Radically Polymerizable Hyperbranched Polymers Having Degradable Linkages
摘要： Hyperbranched polymers having a number of reductive disulfide bonds and radically reactive vinyl groups were synthesized by the bulk radical homopolymerization of bis(2-methacryloyloxyethyl)disulfide (disulfide based dimethacrylate, DSDMA) as a divinyl monomer in the presence of methyl 2-(bromomethyl)acrylate as an addition-fragmentation chain transfer agent. The resulting hyperbranched polymers (HB-DSDMAs) were photocured by irradiated at 365 nm in the presence of 2,2-dimethoxy-2-phenylacetophenone as a photo radical initiator. The photocured HB-DSDMA exhibited high transparency in the visible region and good solvent resistance for various organic solvents. Reduction of the disulfide groups smoothly proceeded in the presence of tributylphosphine as a reductant, and the cured HB-DSDMAs were completely solubilized. HB-DSDMAs were also photocured by irradiation at 254 nm due to the homolysis of the disulfide groups with subsequent initiation of the radical polymerization.
关键词： Photo cleavage,Reductive decomposition,Hyperbranched,Degradable,Curable,polymer,Photopolymerization
更新于2025-09-19 17:15:36
-
Enhanced dielectric property and energy density in poly(vinylidene fluoride-chlorotrifluoroethylene) nanocomposite incorporated with graphene functionalized with hyperbranched polyethylene- <i>graft</i> -poly(trifluoroethyl methacrylate) copolymer
摘要： Polymer film capacitors are attractive as promising candidates for potential applications in compact and efficient electric power systems. The development of a method for producing a polymer nanocomposite with enhanced dielectric property and a high energy density is a fundamental solution for electric storage in a film capacitor. In this work, a hyperbranched polyethylene-graft-poly(trifluoroethyl methacrylate) (HBPE-g-PTFEMA) copolymer was synthesized to exfoliate and functionalize graphene from natural graphite in chloroform on the basis of the CH–π non-covalent stacking between the HBPE-g-PTFEMA stabilizer and graphene. Examination of the morphologies by transmission electron microscopy (TEM) and atomic force microscopy (AFM) confirmed that the resulting graphene had a lateral size of 0.2–0.6 μm and a thickness of around 4 layers. The presence of peaks due to F in the X-ray photoelectron spectroscopy (XPS) spectra of graphene indicates that the fluorinated copolymer was attached to the surface of nanosheets. Few-layer graphene was introduced into a poly(vinylidene fluoride-chlorotrifluoroethylene) (P(VDF-CTFE)) matrix via simple solution casting. The relative content of the electroactive phase in the nanocomposite film increased because the phase transition from the α- to the β-phase was induced by the addition of graphene. The dielectric constant increased to 24.8 with a low dielectric loss of 0.06 at 100 Hz for a 0.8 vol% nanocomposite, and a released energy density of 4.6 J cm?3 with a charge–discharge efficiency of 62% at 250 MV m?1 was achieved with a 0.1 vol% nanocomposite, which was attributed to the combination of the large content of the electroactive phase and interfacial polarization. This strategy based on a nanocomposite with graphene exfoliated by a fluoropolymer sheds light on the mechanism of interfacial polarization and exhibits commendable prospects for applications in flexible film capacitors.
关键词： graphene,poly(vinylidene fluoride-chlorotrifluoroethylene),hyperbranched copolymer,nanocomposite,energy density,dielectric property
更新于2025-09-19 17:15:36
-
Solution-Processed Anatase Titania Nanowires: From Hyperbranched Design to Optoelectronic Applications
摘要： The utilization of solar energy and the development of its related optoelectronic devices have become more important than ever. Solar cells or photoelectrochemical (PEC) cells that require the design of light harvesting assemblies for efficiently converting solar light into electricity or solar fuels are of particular interest. Semiconductor TiO2, serving as the photoelectrode for photovoltaic devices (e.g., dye- or quantum dot-sensitized solar cells (DSSCs/QDSSCs) or perovskite solar cells (PSCs)) and PEC cells, has aroused intense research interest owing to its inherent characteristics of wide band gap and promising optical and electrical properties. TiO2 nanowires (TNWs) have been widely used in optoelectronic devices due to their unique 1D geometry and salient optical and electrical properties. However, the insufficient surface area resulting from the relatively large diameter of NWs and considerable free space between adjacent NWs restricts their optoelectronic performance. Hence, it is desirable to explore every feasible aspect of TNWs in terms of structural design and optical management, aiming to further improve the performance of optoelectronic devices. In this Account, we present a brief survey of strategies for designing branched or hyperbranched TNW-based photoelectrodes and their applications in solar cells and PEC cells. The general strategies (e.g., alkaline/acid hydrothermal method, lift-off transfer, and self-assembly approach) are discussed to address the challenges associated with fabricating TNWs on transparent conducting oxide (TCO) substrates. A series of strategies to fabricate judiciously designed 3D branched array architectures, including length tuning and sequential surface branched or hyperbranched modification, are proposed. The versatile implantation of the TNWs onto other backbones (nanosheets, nanotubes, hollow spheres, or multilayered electrodes) and substrates (fiber-shaped metal wire or mesh, flexible metal foil, or plastic sheet) is demonstrated to construct a new class of the TNW-embedded composite electrode materials with desired morphological characteristics and optoelectronic properties, for example, favorable energy level alignment for cascade charge transfer and rational homogeneous/heterogeneous interfacial engineering. The functionalities of TNW-based electrodes include enlarged surface area and superior light scattering for maximized light harvesting, as well as facilitated charge transport and suppressed charge recombination for enhanced charge collection, which are promising in optoelectronic fields such as solar cells, photocatalysis, and PEC cells. Beyond TNWs, one can also integrate other types of semiconductor (e.g., Fe2O3 or WO3) NWs into rationally designed structures for preparing novel photocatalytic materials with panchromatic absorption, efficient charge transfer, and excellent catalytic properties. Finally, an insightful perspective for rational design of advanced NW-based materials is provided.
关键词： Solar cells,Hyperbranched design,Anatase titania nanowires,Photoelectrochemical cells,Optoelectronic applications,Solution-processed
更新于2025-09-19 17:15:36
-
Controlled Design of a Robust Hierarchically Porous and Hollow Carbon Fiber Textile for High‐Performance Freestanding Electrodes
摘要： It is difficult to simultaneously get high mechanical strength and high self-healing efficiency within a short healing time for self-healing polyacrylate coatings reported so far. Herein, derived from multi-maleimide terminated hyperbranched polysiloxane, linear polyacrylate with furan-containing side chain and polydopamine particles (photothermal conversion agent), a new kind of polyacrylate coating (HPA) with a strong and flexible crosslinking network was developed, which simultaneously shows high mechanical strength and high self-healing efficiency within a short time. With 0.3 wt% polydopamine particles in HPA, the resulting coating (HPA3) has the highest toughness (2.63±0.10 MPa) with 12.9±0.7 MPa of tensile strength and 23.9±1.6% of elongation at break; what’s more, the self-healing efficiency of HPA3 is over 87.6% after only 2.5 min near-infrared laser irradiation, overcoming intractable problems in developing self-healing polyacrylate coatings. The study on the mechanism behind these outstanding performances of HPA system reveals that the reversible covalent crosslinking formed by multi-maleimide terminated hyperbranched polysiloxane is the necessary and crucial factor for simultaneously getting high mechanical strength and high self-healing efficiency at short time.
关键词： hyperbranched polysiloxane,reversible covalent,self-healing,coating,polyacrylate
更新于2025-09-19 17:13:59
-
Planar perovskite solar cells using triazatruxene-based hyperbranched conjugated polymers and small molecule as hole-transporting materials
摘要： Conjugated polymers have been widely used as hole-transporting materials (HTMs) in planar perovskite solar cells (p-PSCs) and play a vital role in hole transport. In this work, based on triazatruxene (TAT), two hyperbranched conjugated polymers (named as TATF8HBP and TATSFHBP) and a star-shaped carbazole-functionalized small molecule (named as TATCz3) are employed as HTMs in p-PSCs with a well solubility. The differences of these materials between carrier mobility, hole extraction and transmission are investigated due to their discrepancy in molecular structure, leading to their photovoltaic performances sequence as follows: TATF8HBP (11.11%) > TATSFHBP (9.48%) > TATCz3 (0.87%). In addition, the short-circuit current density (Jsc), open circuit voltage (Voc) and fill factor (FF) of p-PSCs show the same trend as PCE does. The results reveal that TATF8HBP exhibits the best performance as a hole-transporting layer (HTL) since the polymer chain and its fluorene unit contribute to the hole transport.
关键词： perovskite solar cells,hyperbranched polymer,triazatruxene derivative,photovoltaic characteristics,hole-transporting materials
更新于2025-09-16 10:30:52
-
Synthesis and properties of hyperbranched polymers for white polymer light-emitting diodes
摘要： In this work, a series of hyperbranched copolymers with fluorene-alt-carbazole as the branches, three-dimensional-structured spiro[3.3]heptane-2,6-dispirofluorene (SDF) as the core, and iridium 1-(4-bromophenyl)-isoquinoline (acetylacetone) (Ir(Brpiq)2acac) as the dimming group were synthesized by one-pot Suzuki polycondensation for white emission. All copolymers show great thermal stabilities and high hole-transporting ability due to the introduction of the carbazole unit. The hyperbranched structures for copolymers can suppress the interchain interactions efficiently, and help to form amorphous films. The fabricated polymer light-emitting devices (PLEDs) based on the above synthesized copolymers realize good white light emission, and achieve high electroluminescence (EL) performance. For example, for the optimized PLED, the maximum luminance and current efficiency reach 6210 cd m?2 and 6.30 cd A?1, respectively, indicating the synthesized hyperbranched copolymers have potential application in solution-processable white polymer light-emitting diodes.
关键词： hyperbranched copolymers,electroluminescence,white emission,Suzuki polycondensation,polymer light-emitting devices
更新于2025-09-16 10:30:52