Xiaochen Dong

Zhejiang University, Hang-hsien, Zhejiang Sheng, China

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Publications (32)85.24 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A series of star block copolymer consisting of poly(stearyl methacrylate) and poly(3-(trimethoxysilyl)propyl methacrylate) was synthesized via atom transfer radical polymerization technique. The resultant polymers were characterized by gel permeation chromatography and 1H NMR. The copolymer can self-assemble into the aggregates in selective solvents, the resulting aggregates can be used as precursor to prepare hybrid nanomaterials conveniently via the hydrolysis reaction of Si(OCH3)3 groups and the condensation reaction of Si(OH)3 groups. Moreover, the effect of the star copolymer-solvent interaction on the aggregation behavior was also discussed. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
    Journal of Applied Polymer Science 05/2008; 108(3):2010 - 2016. DOI:10.1002/app.27719 · 1.64 Impact Factor
  • Anguo Xiao · Li Wang · Qingquan Liu · Haojie Yu · Xiaochen Dong
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    ABSTRACT: MgCl2/AlCl3-supported Ziegler–Natta catalysts were prepared using the one-pot milling method and low isotactic polypropylene was synthesized using this catalyst. The results indicated that higher Ti content in catalyst and higher polymerization temperature lead to higher isotactic index of resultant polypropylene. It was found that when Ti content was 1.2 wt% and the ratio of AlCl3/MgCl2 (mol/mol) was 0.1 in MgCl2/AlCl3-supported Ziegler–Natta catalyst, the activity of catalyst was highest at 30°C.
    Designed Monomers & Polymers 03/2008; 11(2):139-145. DOI:10.1163/156855508X298044 · 2.21 Impact Factor
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    ABSTRACT: Phloroglucin-based ferrocenyl compounds, including hyperbranched phloroglucin-based ferrocenyl polymer and phloroglucin-based ferrocenyl dendrimer (Generation0), were prepared by a convenient approach. Cyclic voltammograms were used to investigate their electrochemical properties, and we found that the scanning rate and solvent had remarkable effects on electrochemical behavior of the compounds. These compounds showed electrochemical responses to the anions, and a selective recognition for H2PO over other anions was observed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
    Journal of Applied Polymer Science 02/2008; 107(3):1539 - 1546. DOI:10.1002/app.27130 · 1.64 Impact Factor
  • Junfeng Zhou · Li Wang · Qiang Yang · Xiaochen Dong · Haojie Yu
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    ABSTRACT: Comb-like amphiphilic block copolymers of maleic anhydride (MA) and stearyl methacrylate (SMA) were prepared through the reversible-addition-fragmentation-transfer polymerization. The resultant copolymers were characterized by gel permeation chromatograph and 1H NMR. The aggregation behaviors of P(MA-alt-SMA)-b-PSMA were investigated in tetrahydrofuran/water. It is of great interest that the aggregates with different morphologies and dimensions could be obtained by adjusting the polymer concentration, water content, and pH. The dimension and structure of these aggregates were investigated by transmission electron microscopy and dynamic light scattering. The effect of the copolymer–solvent interaction on these aggregations was discussed.
    Colloid and Polymer Science 11/2007; 285(12):1369-1376. DOI:10.1007/s00396-007-1695-8 · 2.41 Impact Factor
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    ABSTRACT: A novel MgCl2-supported and low Ti-loading Ziegler–Natta (Z–N) catalyst was prepared by one-pot ball milling. Polypropylenes (PPs) with special microstructures were synthesized by using this catalyst. Complex gel-permeation chromatography (GPC) data of the resultant PPs were analyzed by fitting the molecular weight distribution (MWD) curves with multiple Flory–Schulz functions. C-NMR spectra of the PPs were also analyzed. A multi-site active center model and the probable structures of the active centers were proposed. Simulation of the pentad intensities of the PPs showed that the modeling results could satisfactorily account for the experimental data, which indicated that the multi-site active center model was plausible and reasonable.
    Designed Monomers & Polymers 11/2007; 10(6):477-486. DOI:10.1163/156855507782401204 · 2.21 Impact Factor
  • Haojie Yu · Li Wang · Junfeng Zhou · Xiaochen Dong · Guohua Jiang
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    ABSTRACT: Poly(diglycidyl maleate-co-stearyl methacrylate) (P(DGMA-co-SMA)) with reactive epoxy groups was synthesized by reaction of poly(maleic anhydride-co-stearyl methacrylate) (P(MA-co-SMA)) and epichlorohydrin. The effect of precipitant on self-assembly behaviors of the resultant copolymer was investigated. It was found that vesicles and nanotubule liked aggregates can be obtained through self-assembly of P(DGMA-co-SMA) in THF solution using CH3CH2OH (EtOH) as precipitant while spheral aggregates can be obtained using H2O as precipitant. The mechanism of the self-assembly behavior was discussed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007
    Journal of Applied Polymer Science 08/2007; 105(3):1156 - 1161. DOI:10.1002/app.26264 · 1.64 Impact Factor
  • Anguo Xiao · Li Wang · Qingquan Liu · Xiaochen Dong
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    ABSTRACT: In this paper, the recent development of ansa-zirconcene catalysts and their co-catalysts, the relationship between the structure of ansa-zirconcene catalytic system and the microstructure of the resultant polypropylene are reviewed. The forming mechanisms of resultant polypropylene microstructure are discussed in view of ansa-zirconcene catalyst structure and their co-catalyst structure.
    Designed Monomers & Polymers 07/2007; 10(4):281-295. DOI:10.1163/156855507781505165 · 2.21 Impact Factor
  • Xiaochen Dong · Li Wang · Libo Deng · Jianhua Li · Jia Huo
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    ABSTRACT: Ethylene polymerization was carried out with multiwalled carbon nanotubes (MWCNTs)-supported Cp2ZrCl2 catalyst. Because of the catalyst pretreated on the surface of the MWNTs, the ethylene was expected to polymerize there. The influences of polymerization temperature and Al/Zr molar ratios on the morphologies of the resultant polyethylene were systematically investigated with SEM. The nano-polyethylene fibres were obtained owing to the fibres of original MWNTs were covered by polyethylene. The diameters of the nano-fibres were 80–130 nm. With the increase of reaction temperature, the “over load” of polyethylene on the surface of CNTs made the polyethylene fibres disappear.
    Materials Letters 06/2007; 61(14):3111-3115. DOI:10.1016/j.matlet.2006.11.025 · 2.27 Impact Factor
  • Ying Chen · Li Wang · Haojie Yu · Quan Shi · Xiaochen Dong
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    ABSTRACT: The synthesis and antibacterial properties of N-halamine copolymers are reported in this paper. 3-(4′-vinylbenzyl)-5,5-dimethylhydantoin (VBDMH) monomer and its copolymers with n-butyl methacrylate (BMA) were prepared under mild conditions. The effects of monomer feeds on the composition of the final copolymers and reaction conversion were investigated. It was found that VBDMH had higher reactivities than BMA in the copolymerization reactions and the reactivity ratios of VBDMH and BMA were calculated to be 8.91 and 0.42, respectively, according to the Fineman–Ross equation in the preparation of PBMA-co-VBDMH. Two chlorination methods were applied and compared in the process of polymers chlorination. After chlorination by tert-butyl hypochlorite, the polymers provided powerful antibacterial activities against Escherichia coli (E. coli). The surface morphologies of the chlorinated polymer films used in antibacterial assessment were observed by scanning electron microscope. The copolymers before and after chlorination were characterized with fourier transform infrared (FTIR) and 1H-nuclear magnetic resonance (1H-NMR). Their thermal properties were analyzed with thermogravimetric analysis (TGA) studies.
    Journal of Materials Science 05/2007; 42(11):4018-4024. DOI:10.1007/s10853-006-1412-x · 2.37 Impact Factor
  • Junfeng Zhou · Li Wang · Xiaochen Dong · Qiang Yang · Jianjun Wang · Haojie Yu · Xu Chen
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    ABSTRACT: A novel brush-type amphiphilic copolymer of PSMA-b-PTMSPMA was synthesized via ATRP technique. As-synthesized polymer was characterized by GPC and 1H NMR. It was of interest that the resultant polymer could self-assemble into micelles with different morphologies and sizes in selective solvents by adjusting the copolymer concentrations. These aggregates could be prepared into novel stable organic/inorganic hybrid nanomaterials by the gelation process. The size and structure of these aggregates and the corresponding hybrid nanomaterials were observed by TEM.
    European Polymer Journal 05/2007; 43(5):1736-1743. DOI:10.1016/j.eurpolymj.2006.09.022 · 3.24 Impact Factor
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    ABSTRACT: A series of well-defined two-armed polymers containing a crown ether core, poly(stearyl methacrylate)-crown ether-poly(stearyl methacrylate) (PSMA-crown-PSMA), with different molecular weight were synthesized via atom transfer radical polymerization (ATRP). The resultant polymers were characterized by 1H NMR and GPC. The self-assembly behaviors of this kind of polymer in selective solvents were studied by TEM, and it was found that polymers with different molecular weight can directly self-assemble into hollow spheres, solid spheres and a monolayer film with regular pores by varying molecular weight and water content. The possible molecular packing motels for their self-assembly behaviors were proposed.
    European Polymer Journal 05/2007; 43(5):2088-2095. DOI:10.1016/j.eurpolymj.2006.08.026 · 3.24 Impact Factor
  • Zhenrong Zhao · Li Wang · Jianfeng Wang · Xiaochen Dong · Haojie Yu
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    ABSTRACT: Ethylene–1-dodecene copolymers were synthesized with novel low-Ti-loading (0.8 wt %) Ziegler–Natta catalysts prepared by a one-pot balling method. 13C-NMR was applied for the quantitative determination of the composites and microstructures of the resultant ethylene–1-dodecene copolymers. The results showed that (1) the ethylene–1-dodecene copolymers obtained from both the MgCl2-supported low-Ti-loading Ziegler–Natta catalyst and the MgCl2/SiO2-bisupported low-Ti-loading Ziegler–Natta catalyst at a 0.6M 1-dodecene concentration had high levels of 1-dodecene and (2) most of the 1-dodecene units were separated by ethylene units in the copolymer chains obtained from the MgCl2-supported low-Ti-loading Ziegler–Natta catalyst, whereas there were some continuous 1-dodecene repeat units in the copolymer chain obtained from the MgCl2/SiO2-bisupported low-Ti-loading Ziegler–Natta catalyst. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1200–1204, 2007
    Journal of Applied Polymer Science 04/2007; 104(2):1200-1204. DOI:10.1002/app.25756 · 1.64 Impact Factor
  • Libo Deng · Li Wang · Haojie Yu · Xiaochen Dong · Jia Huo
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    ABSTRACT: Anion recognition has attracted increasing attention due to the importance in biology and environment protection. Ferrocenyl dendrimers represent a type of novel competitive candidate for anion recognition owing to the combination of merits with ferrocene and dendrimer. This review focuses on recent progress in synthesis of ferrocenyl dendrimers and their application in anion recognition.
    Designed Monomers & Polymers 03/2007; 10(2):131-143. DOI:10.1163/156855507780378258 · 2.21 Impact Factor
  • Wenqin Wang · Li Wang · Xiaochen Dong · Tianxu Sun · Jianfeng Wang
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    ABSTRACT: Ethylene/1-hexene copolymerization was carried out with polystyrene-supported metallocene catalyst. It was found that the kinetic of the copolymerization was strongly influenced by the steric hindrance of carrier. The influences of 1-hexene concentration in the feed on catalyst productivity and comonomer reactivity were investigated. The microstructure of resultant copolymer was analyzed by 13C NMR. It was found that the different carriers have slight effect on the composite of copolymer. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1574–1577, 2006
    Journal of Applied Polymer Science 10/2006; 102(2):1574-1577. DOI:10.1002/app.23721 · 1.64 Impact Factor
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    ABSTRACT: Nanowires were prepared by ethylene polymerization in situ with carbon nanotubes (CNTs)-supported Cp2ZrCl2 catalyst. It was found that the metallocene catalyst was first adsorbed on the surface of the CNTs and then the polymerization of ethylene was initiated. The resulting PE could encapsulate on the surface of the CNTs to form nanowire. The diameter of nanowire could be controlled easily by the polymerization conditions. The possible mechanism of formation of nanopolyethylene wire is proposed. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1291–1294, 2006
    Journal of Applied Polymer Science 08/2006; 101(3):1291 - 1294. DOI:10.1002/app.23321 · 1.64 Impact Factor
  • Xiaochen Dong · Li Wang · Tianxu Sun · Junfeng Zhou · Qiang Yang
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    ABSTRACT: Pristine CNTs and open-ended CNTs were used as supports for Cp2ZrCl2. The effects of the structure of the supports on the activity of the catalyst in ethylene polymerization and the resulting PE morphology were studied. It was found that the two supported catalysts had similar activity. The SEM studies proved that the resulting PE prepared with pristine CNT-supported catalyst exhibited fibrous morphology, while the other PE mainly exhibited fractional morphology. The possible formation mechanism of these two kinds of morphology was proposed.
    Journal of Molecular Catalysis A Chemical 08/2006; 255(1):10-15. DOI:10.1016/j.molcata.2006.03.053 · 3.68 Impact Factor
  • Xiaochen Dong · Li Wang · Junfeng Zhou · Libo Deng · Jia Huo · Chunlei Zhang
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    ABSTRACT: Silica with small and regular pore sizes was synthesized by hydrothermal crystallization and investigated with thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption-desorption, and scanning electron microscopy (SEM). The ethylene polymerization was carried out with the silica-supported metallocene catalyst, and the morphology of the resultant polyethylene was investigated with SEM. It was found that the silica could break up into sheet fragments instantaneously during polymerization and the polyethylene could replicate it to obtain nanosheet polyethylene. A possible formation mechanism of the nanosheet polyethylene is proposed.
    The Journal of Physical Chemistry B 08/2006; 110(26):13045-9. DOI:10.1021/jp062527p · 3.30 Impact Factor
  • Xiaochen Dong · Li Wang · Jianjun Wang · Junfeng Zhou · Tianxu Sun
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    ABSTRACT: Propylene polymerization was carried out with MCM-41 supported rac-Et(Ind)2ZrCl2 catalysts, in the presence and absence of beta-cyclodextrin. The resultant PP was studied by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and differential scanning calorimetry. Through comparison of the results, it was found that the channels of MCM-41 could act as a nanoreactor of propylene polymerization and the polypropylene (PP) contained in the channels had noncrystal structure. However, the PP could grow out of the channels and form some crystals after the active sites on the surface of MCM-41 were destroyed. This showed that the channels of MCM-41 had great confinement effects on propylene polymerization.
    The Journal of Physical Chemistry B 06/2006; 110(18):9100-4. DOI:10.1021/jp060238v · 3.30 Impact Factor
  • Junfeng Zhou · Li Wang · Xiaochen Dong · Tao Chen · Qiang Yang · Chang Chen · Xu Chen
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    ABSTRACT: Brush-type amphiphilic block copolymers of 3-(trimethoxysilyl)propyl methacrylate (TMSPMA) and stearyl methacrylate (SMA) were prepared through the initiation of chloroacetylferrocene using atom transfer radical polymerization (ATRP) in anisole solution. The resultant copolymers were characterized by 1H NMR and GPC. We investigated the morphologies and sizes of organic/inorganic hybrid nanoballs using aggregates of these multi-block copolymers as precursors after a sol–gel process. The effect of the copolymer–solvent interaction on these aggregations was discussed.
    Nanotechnology 05/2006; 17(11):2745. DOI:10.1088/0957-4484/17/11/006 · 3.67 Impact Factor
  • Tianxu Sun · Li Wang · Xiaochen Dong · Wei Wang
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    ABSTRACT: The propagation mechanism of 1-alkenes, especially propylene, for newly developed catalysts such as metallocene catalysts and bis(phenoxy-amine)zirconium-based catalysts and traditional Ti-based Ziegler–Natta catalysts, and the relationship between the structure of the catalyst and the structure of polyolefins produced, was reviewed. We believe that the propagation mechanism of 1-alkenes, especially propylene, for traditional Ti-based heterogeneous catalysts and the relationship between the structure of the catalyst and the structure of polyolefins produced is elucidated more explicitly with metallocene catalysts and bis(phenoxy-amine)zirconium-based catalysts as reference.
    Designed Monomers & Polymers 03/2006; 9(2):117-127. DOI:10.1163/156855506776382691 · 2.21 Impact Factor