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Wang H.,Shandong University | Wang H.,Key Laboratory of Special Functional Aggregated Materials | Tan Y.,Shandong University | Tan Y.,Key Laboratory of Special Functional Aggregated Materials | And 5 more authors.
Journal of Macromolecular Science, Part A: Pure and Applied Chemistry | Year: 2011

A water-soluble monomer N1-(4-vinylbenzyl)-pentane-1,5-diamine dihydrochloride (VBPDA) with cadaverine (1,5-pentanediamine) group was synthesized. pH-responsive polymer with cadaverine group was obtained by free radical polymerization of VBPDA using 4,4-azobis(4-cyanovaleric acid) (ACVA) as the initiator. The structure and molecular weight of the polymer were characterized by FTIR, 1H-NMR and GPC-MALLS. Aggregation behavior of the polymer in aqueous solution was investigated by dynamic light scattering (DLS), UV-Vis and fluorescence measurements. The experimental results show that the fluorescence intensity of the aggregates decreases and the size of the aggregates increases with increasing pH due to the continuous dehydration of the cadaverine side groups. © 2011 Taylor & Francis Group, LLC.


Chen G.,Key Laboratory of Special Functional Aggregated Materials | Chen G.,Shandong University | Li W.,Shandong University | Zhang C.,Key Laboratory of Special Functional Aggregated Materials | And 4 more authors.
Journal of Chromatography A | Year: 2012

Phenyl-ended hyperbranched carbosilane (HBC) is synthesized and immobilized onto the inner wall of a fused silica capillary column using a sol-gel process. The hybrid coating layer formed is used as a stationary phase for gas chromatography (GC) and as an adsorption medium for solid phase microextraction (SPME). Trifluoroacetic acid, as a catalyst in this process, helps produce a homogeneous hybrid coating layer. This result is beneficial for better column chromatographic performances, such as high efficiency and high resolution. Extraction tests using the novel hybrid layer show an extraordinarily large adsorption capacity and specific adsorption behavior for aromatic compounds. A 1. ppm trace level detectability is obtained with the SPME/GC work model when both of the stationary phase and adsorption layer bear a hyperbranched structure. A large amount of phenyl groups and a low viscosity of hyperbranched polymers contribute to these valuable properties, which are important to environment and safety control, wherein detection sensitivity and special adsorption behavior are usually required. © 2012 Elsevier B.V..


Wang Y.,Shandong University | Wang Y.,CAS Technical Institute of Physics and Chemistry | Yin Z.,Qingdao University of Science and Technology | Xie Z.,CAS Technical Institute of Physics and Chemistry | And 5 more authors.
ACS Applied Materials and Interfaces | Year: 2016

In this work, aminopropylmethylpolysiloxane (AMS) functionalized luminescent carbon dots (AMS-CDs) were prepared via a one-step solvothermal method. AMS-CDs could be self- or co-cross-linking with AMS to form 3D flexible transparent silicone rubbers (SRs) where CDs acted as cross-linking points, so the loading fraction of AMS-CDs could be adjusted from 10 to 100 wt %, thus modulating fluorescence properties and flexibility of silicone rubbers. Because of the self-curing property and high thermal stability, AMS-CDs were also studied in white LEDs (WLEDs), serving as a color conversion and encapsulation layer of GaN based blue LEDs simultaneously that would avoid the traditional problem of poor compatibility between emitting and packaging materials. And the color coordinate of AMS-CDs based WLEDs (0.33, 0.28) was very close to the pure white light. In addition, the obtained CDs cross-linked SRs had good transparency (T > 80%) at 510-1400 nm and high refractive indexes (1.33-1.54) that could meet the need of commercial packaging materials and optical application. AMS-CDs were also promising to be used in the UV LEDs based WLEDs according to their wide wavelength emission and flexible optoelectronic device. © 2016 American Chemical Society.


Yang H.,Shandong University | Yang H.,Key Laboratory of Special Functional Aggregated Materials | Tan Y.,Shandong University | Tan Y.,Key Laboratory of Special Functional Aggregated Materials | And 4 more authors.
Journal of Polymer Research | Year: 2011

The interaction between poly(methacrylic acid) (PMAA) and cucurbit[7]uril (CB[7]) in aqueous solution were investigated by dynamic light scattering (DLS), fluorescence techniques, UV-spectrophotometer, and resonance light scattering (RLS). The experimental results show that the aggregates were formed between CB[7] and H + of PMAA by the hydrogen bonding interaction that increases with increasing the concentration of CB[7], which leads to the formation of the larger aggregates. Interestingly, PMAA has temperature sensitivity with the addition of CB[7] by UV-spectrophotometer and DLS. The pH of the solution of PMAA appears a inflection point with increasing the concentration of CB[7] comparing with the increase of the electrical conductivity all the time with the addition of CB[7]. In addition, in order to investigate the effect of cation on the size of the aggregates and avoid the effect of other anions at the same time, the dilute ammonia was added into the solution of PMAA. The experimental data show that the size of the aggregates increases with adding CB[7] because CB[7] could combine with both NH 4 + by the electrostatic and iondipole interactions and H + by the hydrogen bonding interaction, and a possible model is proposed to explain the host-guest interactions between PMAA and CB[7]. © 2011 Springer Science+Business Media B.V.


Du X.,Shandong University | Du X.,Key Laboratory of Special Functional Aggregated Materials | Tan Y.,Shandong University | Tan Y.,Key Laboratory of Special Functional Aggregated Materials | And 6 more authors.
Journal of Polymer Research | Year: 2011

The double-hydrophilic multiblock copolymers poly(ethylene glycol)-b-poly((2-acrylamido-2-methyl propanesulfonic sodium) (PEG-b-PAMPSNa) with different PEG and PAMPSNa ratio have been synthesized. The copolymers were characterized by FTIR, 1H-NMR, elemental analysis, thermogravimetric analysis (TGA) and Gel permeation chromatography coupled with multi-angle light scattering laser light scattering (GPC-MALLS). According to the results, it was seen that the compositions had obvious influences to the characteristics of the copolymers. With more PEG content in the copolymers, the molecular weights and thermal stability increased, and the copolymers chain structures were more flexible. The solution properties of the copolymers were studied by dynamic light scattering (DLS), which also have great relationship with the copolymers compositions. And PEG-b-PAMPSNa was used as a crystal growth modifier to control the crystallization of BaSO4 in its aqueous solution. The morphologies and sizes of BaSO4 crystals can be well controlled by the copolymer. With the increasing concentration, the copolymer assembled in water and interacted with inorganic particles on the crystal faces, which is concerned with the controlling of crystal growth in solution. © 2010 Springer Science+Business Media B.V.


Zhang R.,Shandong University | Zhang R.,Key Laboratory of Special Functional Aggregated Materials | Li W.,Shandong University | Li L.,Shandong University | And 3 more authors.
Thin Solid Films | Year: 2012

Microstructures bridge the molecular and the macroscopic scales. Disk-patterned microstructures obtained from microcapsules in this work are assembled through layer-by-layer which allowed depositing the natural polysaccharides chitosan (CS) and sodium alginate (SA) on porous CaCO 3 microparticles. Besides CS and SA assembled outside CaCO 3 microparticles, some CS and SA were also encapsulated by permeation in the pores of CaCO 3. During the dissolution of CaCO 3, the Ca 2 + cations from decomposed CaCO 3 were found to interact with alginate (AL) anions and to form Ca 2 +-AL scaffolds. The adhesion arising from the OH groups in polysaccharides to solid surfaces was attributed to the disk-patterned microstructures. The calcium content (2.290 × 10 - 10 mg) in each (CS/SA) 4 microstructure amounts to about 1% of the total mass of the CaCO 3 core. This work thus demonstrates the interaction between the decomposed core elements and the polysaccharides existing both inside and outside the porous cores. Such microstructures containing both Ca 2 + and natural polysaccharides have potential applications in biological and medical systems. © 2012 Elsevier B.V. All rights reserved.


Diao S.,Key Laboratory of Special Functional Aggregated Materials | Diao S.,Shandong University | Zhang S.,Key Laboratory of Special Functional Aggregated Materials | Zhang S.,Shandong University | And 8 more authors.
Journal of Applied Polymer Science | Year: 2011

Two kinds of treated fumed silica were prepared by treatment with either tetraphenylphenyltriethoxysilane (TPHTS) or both tetraphenylphenyltriethoxysilane and hexamethyldisilazane (TPHMTS), and were used as reinforcing filler for silicone rubber. The resistance to irradiation of the silicone rubber obtained was investigated by gamma ray of dose 500 kGy in air. The mechanical properties and the average molecular weight between crosslinking points (Mc) of the silicone rubber were determined before and after irradiation. The results show that the fumed silica treated by tetraphenylphenyltriethoxysilane (TPHPHS) can effectively improve the radiation resistance of silicone rubber while the fumed silica treated by both tetraphenylphenyltriethoxysilane and hexamethyldisilazane (MMN) cannot only effectively improve the radiation resistance of silicone rubber but also has excellent reinforcing effect on silicone rubber. © 2010 Wiley Periodicals, Inc.


Wang X.,Key Laboratory of Special Functional Aggregated Materials | Wang X.,Shandong University | Lu H.,Key Laboratory of Special Functional Aggregated Materials | Lu H.,Shandong University | And 4 more authors.
Journal of Non-Crystalline Solids | Year: 2010

Two series of rare earth-containing luminescent silicone resins have been achieved by sol-gel method. The precursors which were modified via acylamidation reactions behave as structural molecular bridges. The silanol groups were used to form the host of silicone resin and the chromophore groups were used to exhibit the luminescence by the cooperative assembly courses with rare earth ions (Eu3+, Tb3+, and Dy3+). The modifications were determined by Fourier transform infrared (FTIR), 1H-NMR spectra and diffuse reflectance ultraviolet-visible spectra (DRUVS). Scanning electronic microscopy (SEM, micrometric scale) and X-ray diffraction studies (XRD, nanometric scale) were employed to evaluate the frameworks of silicone resin materials. Narrow-width red emission was observed in Eu (III) resin materials and green emissions were obtained in Tb (III) resin materials and Dy (III) resin materials, indicating that an efficient intramolecular energy transfer took place in these resins. Further investigations into the luminescent properties of these materials show that the luminescence in these materials is quite operative by means of the design of molecular structure. Crown Copyright © 2010 Published by Elsevier B.V. All rights reserved.


Chen D.-M.,Key Laboratory of Special Functional Aggregated Materials | Wang S.,Key Laboratory of Special Functional Aggregated Materials | Li H.-X.,CAS Shanghai Institute of Organic Chemistry | Zhu X.-Z.,CAS Beijing National Laboratory for Molecular | Zhao C.-H.,Key Laboratory of Special Functional Aggregated Materials
Inorganic Chemistry | Year: 2014

The efficient synthesis has been disclosed to achieve a new class of ladder-type molecules, B,S-bridged p-terphenyls (BS-TPs). Their properties were fully characterized by UV-vis and fluorescence spectroscopy in both solution and solid state, time-resolved fluorescence spectroscopy, DFT theoretical calculations, and cyclic voltammetry. A detailed comparison between anti-BS-TP and its analogue B,N-bridged p-terphenyl (BN-TP) was made to elucidate the effect of displacement of bridging N with S atom on the properties. The introduction of S rather than N atom as bridging atom leads to increased fluorescence efficiency in both solution and solid state as well as enhanced reduction stability. And thus this new class of ladder-type molecules are highly emissive in both solution and solid state and display reversible reduction wave in cyclic voltammograms, denoting their promising potentials as electron-transporting solid-state emitters. In addition, this new class of molecules are capable of detecting F- and Hg2+ with different fluorescence responses, owing to the high Lewis acidity of the B center to coordinate with F- anions and the great mercury-philicity of the S center to complex with Hg2+ cations. © 2014 American Chemical Society.


PubMed | Key Laboratory of Special Functional Aggregated Materials
Type: | Journal: Journal of chromatography. A | Year: 2012

Phenyl-ended hyperbranched carbosilane (HBC) is synthesized and immobilized onto the inner wall of a fused silica capillary column using a sol-gel process. The hybrid coating layer formed is used as a stationary phase for gas chromatography (GC) and as an adsorption medium for solid phase microextraction (SPME). Trifluoroacetic acid, as a catalyst in this process, helps produce a homogeneous hybrid coating layer. This result is beneficial for better column chromatographic performances, such as high efficiency and high resolution. Extraction tests using the novel hybrid layer show an extraordinarily large adsorption capacity and specific adsorption behavior for aromatic compounds. A 1 ppm trace level detectability is obtained with the SPME/GC work model when both of the stationary phase and adsorption layer bear a hyperbranched structure. A large amount of phenyl groups and a low viscosity of hyperbranched polymers contribute to these valuable properties, which are important to environment and safety control, wherein detection sensitivity and special adsorption behavior are usually required.

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