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ABSTRACT: Polyhedral oligomeric silsesquioxane (POSS)-containing red fluorescent nanoparticles were designed and prepared for rapid detection of aqueous fluoride ions by virtue of the fluoride-triggered self-quenching of perylene bisimide dyes in nanoparticle cores.
Chemical Communications 04/2013; · 6.17 Impact Factor
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ABSTRACT: A simple chemodosimeter array has been successfully achieved for the detection and discrimination of different palladium species by using principal component analysis.
The Analyst 12/2012; · 4.23 Impact Factor
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Macromolecules 04/2012; 45:3394-3401. · 5.17 Impact Factor
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ABSTRACT: An aqueous ratiometric ESIPT sensor with a 87 nM (15.4 ppb) detection limit was successfully synthesized and applied for detection of all oxidation states of palladium species.
Chemical Communications 03/2012; 48(23):2867-9. · 6.17 Impact Factor
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ABSTRACT: Alcohols have been demonstrated to be efficient reducing agents for AGET-ATRP for the first time. Well-controlled polymerizations have been successfully achieved with the typical characteristics of "living"/controlled radical polymerization.
Chemical Communications 02/2012; 48(22):2800-2. · 6.17 Impact Factor
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ABSTRACT: Two novel conjugated polymers containing a 2,2'-biimidazole moiety have been designed, synthesized, and demonstrated to be used as an effective fluorescent sensing platform for detection of Ag(+) and cysteine. This is the first example utilizing a fluorescent conjugated polymer-Ag(+) complex to selectively detect Cys with a nanomolar range detection limit.
Chemical Communications 11/2011; 48(1):118-20. · 6.17 Impact Factor
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ABSTRACT: Living/controlled free radical copolymerization of chlorotrifluoroethene and butyl vinyl ether has been successfully achieved at room temperature under (60)Co γ-ray irradiation in the presence of S-benzyl O-ethyl dithiocarbonate. The alternating and block copolymers have been obtained with well-defined molecular weights and narrow molecular weight distributions.
Chemical Communications 07/2011; 47(27):7839-41. · 6.17 Impact Factor
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ABSTRACT: A colorimetric and ratiometric fluorescent chemosensor for F(-) has been prepared, which is based on combination of desilylation reaction and excited-state proton transfer from the desilylation product to F(-). The sensor exhibits rapid response, excellent selectivity and sensitivity to F(-).
Chemical Communications 02/2011; 47(13):3957-9. · 6.17 Impact Factor
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ABSTRACT: A novel conjugated polymer chemosensor 1 containing 2,6-bis(2-thienyl)pyridine has been synthesized and exhibits a high sensitivity and selectivity for palladium ion detection based on the fluorescent quenching effect.
Chemical Communications 02/2011; 47(6):1731-3. · 6.17 Impact Factor
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ABSTRACT: A Y-shaped amphiphilic fluorinated monomer, 1-(1H,1H,2H,2H-perfluorodecyloxy)-3-(3,6,9-trioxadecyloxy)-propan-2-yl acrylate has been synthesized and its polymerization by reversible addition-fragmentation chain transfer (RAFT) homopolymerization has been investigated. The results show that the molecular weights of the polymers are controlled and all the molecular weight distributions are lower than 1.4. Well-defined copolymers with 2-(N,N-dimethylamino)ethyl methacrylate have been prepared by RAFT polymerization, and the surface properties of the block and random copolymers have been examined by contact angle measurement for water and hexadecane. It has been found that the surfaces of the block copolymers simultaneously exhibit excellent anti-fog and oil-repellent properties.
Macromolecular Rapid Communications 10/2010; 31(20):1816-21. · 4.60 Impact Factor
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ABSTRACT: Mixed micelles of polystyrene-b-poly(N-isopropylacrylamide) (PS-b-PNIPAM) and two polystyrene-b-poly(ethylene oxide) diblock copolymers (PS-b-PEO) with different chain lengths of polystyrene in aqueous solution were prepared by adding the tetrahydrofuran solutions dropwise into an excess of water. The formation and stabilization of the resultant mixed micelles were characterized by using a combination of static and dynamic light scattering. Increasing the initial concentration of PS-b-PEO in THF led to a decrease in the size and the weight average molar mass (〈Mw〉) of the mixed micelles when the initial concentration of PS-b- PNIPAM was kept as 1 × 10−3 g/mL. The PS-b-PEO with shorter PS block has a more pronounced effect on the change of the size and 〈Mw〉 than that with longer PS block. The number of PS-b-PNIPAM in each mixed micelle decreased with the addition of PS-b-PEO. The average hydrodynamic radius 〈Rh〉 and average radius of gyration 〈Rg〉 of pure PS-b-PNIPAM and mixed micelles gradually decreased with the increase in the temperature. Both the pure micelles and mixed micelles were stable in the temperature range of 18 °C–39 °C. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 1168–1174, 2010
Journal of Polymer Science Part B Polymer Physics 04/2010; 48(11):1168 - 1174. · 1.53 Impact Factor
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Journal of Polymer Science Part A Polymer Chemistry 02/2010; 48(6):1348 - 1356. · 3.92 Impact Factor
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ABSTRACT: Homogeneous dispersion and functionalization of pristine multiwalled carbon nanotubes (MWNTs) in various organic solvents was achieved by a simple ultrasonic process in the presence of an azide copolymer, poly(4-azidophenyl methacrylate-co-methyl acrylate)(P(APM-co-MA)). The copolymes were noncovalently attached to the surface of the MWNTs via pi-pi interactions to form MWNT-P(APM-co-MA) composites. The composites were characterized by transmission electron microscopy, thermogravimetric analysis, Raman spectra and UV-vis spectra. The solution dispersion of the MWNT-P(APM-co-MA) composites were used to prepare superhydrophobic cotton fabric by a facile dip-coating approach. MWNTs were covalently attached to the surface of the cotton fabric through the chemical reactions between the azide groups of P(APM-co-MA) with both MWNTs and cotton fibers. The reactions are based on UV-activated nitrene chemistry. Owing to the nanoscale roughness introduced by the attachment of MWNTs, the cotton fabric surface was transformed from hydrophilic to superhydrophobic with an apparent water contact angle of 154 degrees . Since MWNTs were covalently attached on the surface of the cotton fabric, the superhydrophobicity possesses high stability and chemical durability.
Langmuir 02/2010; 26(10):7529-34. · 4.19 Impact Factor
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ABSTRACT: A facile strategy for synthesis of α-heterobifunctional polystyrenes is reported. The novel functional polystyrenes have been successfully synthesized via a combination of atom transfer radical polymerization (ATRP) and chemical modification of end-functional groups. First, ε-caprolactone end-capped polystyrenes with controlled molecular weight and low polydispersity were prepared by ATRP of styrene using α-bromo-ε-caprolactone (αBrCL) as an initiator. Then, removal of the terminal bromine atom was performed with iso-propylbenzene in the presence of CuBr/PMDETA. Finally, ring-opening modifications of the caprolactone group were carried out with amines, n-butanol and H(2) O to produce novel polystyrenes containing two different functional groups at one end.
Macromolecular Rapid Communications 11/2009; 30(22):1922-7. · 4.60 Impact Factor
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ABSTRACT: The phenylphosphinic acid-functionalized microspheres were successfully prepared by “one-pot” emulsion polymerization of styrene/divinylbenzene with a functional macromolecular reversible addition−fragmentation chain transfer (RAFT) agent, poly(3-[2-(acryloyloxy)ethoxy]-3-oxopropyl(phenyl)phosphinic acid)-block-polystyrene (P(AOPA)-b-PSt), as an amphiphilic emulsifier. The monodisperse microspheres were obtained with about 300 nm of the diameters and the clear core−shell structures, while phenylphosphinic acid groups were introduced into the shell via the RAFT process. The functionalized microspheres show high ability to coordinate with Cu2+ or Fe3+.
11/2009;
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ABSTRACT: A novel well-defined amphiphilic block copolymer, with the polyhedral oligomeric silsesquioxane (POSS) moiety at the junction of the two blocks of polystyrene and poly(ethylene oxide) (PEO), was designed and synthesized. First, a macroinitiator containing a POSS moiety and a PEO chain was prepared and then atom transfer radical polymerization of styrene was carried out in the presence of the macroinitiator in bulk. The polymerization results show that the process bears the characteristics of controlled/living free radical polymerizations. The structure and molecular weight of the polymers were characterized by GPC, (1) H NMR, and FT-IR spectroscopy. The self-assembly behaviors of the polymers was investigated by TEM and SEM. It was observed that the polymers can self-assemble into vesicles in aqueous solution.
Macromolecular Rapid Communications 06/2009; 30(12):1015-20. · 4.60 Impact Factor
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ABSTRACT: A new vinyl aryl azide monomer, 4-azidophenyl methacrylate (APM), has been synthesized and characterized by (1) H NMR and FT-IR spectroscopy. The thermal stability of APM has been investigated by temperature-dependent FT-IR spectroscopy and (1) H NMR, and the monomer has been demonstrated to be quite stable at ambient temperature. Reversible addition-fragmentation chain transfer (RAFT) homopolymerization and copolymerizations of APM with methyl acrylate, methyl methacrylate, and styrene have been carried out at room temperature using a redox initiator, benzoyl peroxide (BPO)/N,N-dimethylaniline (DMA). The results show that the polymerizations bear all the characteristics of controlled/living free-radical polymerizations. Moreover, the cycloaddition of azido group to carbon-carbon double bond can be avoided in the polymerization process at room temperature.
Macromolecular Rapid Communications 03/2009; 30(6):442-7. · 4.60 Impact Factor
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Macromolecular Chemistry and Physics 02/2009; 210(6):478 - 485. · 2.36 Impact Factor
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ABSTRACT: Synthesis of novel amphiphilic supramolecular miktoarm star copolymers has been achieved through complementary molecular recognition and interactions between carboxy groups and amino groups. Polystyrenes carrying two and one carboxy groups at the middle of the polymer chain are used as precursors to react with poly(ethylene oxide) (PEO) end-capped with a primary amine functionality (-NH(2) ) or a quaternary ammonium hydroxide functionality (-N(+) (CH(2) CH(3) )(3) OH(-) ). The result suggests that the basicity of the amine plays a key role in the molecular recognition procedure. The efficiency of ionic bond formation can be enhanced from 40% up to 97% by using PEO-N(+) (CH(2) CH(3) )(3) OH(-) instead of PEO-NH(2) . The obtained supramolecular polymers can be dissociated in dilute acid solution at room temperature.
Macromolecular Rapid Communications 01/2009; 30(2):104-8. · 4.60 Impact Factor
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Journal of Polymer Science Part A Polymer Chemistry 10/2008; 46(23):7667 - 7676. · 3.92 Impact Factor
