Sixun Zheng

Shanghai Jiao Tong University, Shanghai, Shanghai Shi, China

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Publications (171)564.73 Total impact

  • Jingang Li · Lei Li · Yixin Xiang · Sixun Zheng

    No preview · Article · Jan 2016 · Industrial & Engineering Chemistry Research
  • Ning Liu · Kun Wei · Lei Wang · Sixun Zheng
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    ABSTRACT: In this contribution, we report a facile synthesis of a well-defined POSS diamine via the Heck reaction. First, 3,13-divinyloctaphenyl double decker silsesquioxane (3,13-divinyl DDSQ) was synthesized via the silylation reaction of octaphenyldicycloocatasiloxane tetrasodium silanolate with methylvinyldichlorosilane. Thereafter, the 3,13-divinyl DDSQ was reacted with 4-bromoaniline with a palladium catalyst. This POSS diamine (viz. 3,13-dianilino DDSQ) has been employed to synthesize the organic–inorganic polyimides with DDSQ in the main chains. Compared to the plain polyimide, the organic–inorganic hybrids displayed improved thermal stability and surface hydrophobicity. The dielectric analysis indicates that the dielectric constants of the organic–inorganic polyimides were significantly decreased with the inclusion of the DDSQ in the main chains whereas the dielectric loss of the polyimides remained almost unchanged.
    No preview · Article · Jan 2016 · Polymer Chemistry
  • Lei Li · Sixun Zheng
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    ABSTRACT: In this study, we examined a facile approach for achieving a fine dispersion of barium titanate (BT) nanoparticles (NPs) in epoxy thermosets. First, the surfaces of BT NPs were modified with poly(ε-caprolactone) (PCL) via a surface-initiated ring-opening polymerization approach. We found that the PCL-grafted BT NPs were easily dispersed in epoxy thermosets. The fine dispersion of the PCL-grafted BT NPs in the epoxy thermosets was evidenced by transmission electron microscopy and dynamic mechanical thermal analysis. We found that the organic–inorganic nanocomposites displayed significantly enhanced dielectric constants and low dielectric loss compared to the control epoxy. The nanocomposites containing 14.1 wt % BT NPs possessed dielectric constants as high as at a frequency of 103 Hz. The dielectric loss was measured to be 0.002 at a frequency of 103 Hz. The improved dielectric properties are accounted for the fine dispersion of the BT NPs in the epoxy thermosets. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43322.
    No preview · Article · Dec 2015 · Journal of Applied Polymer Science
  • Houluo Cong · Lei Li · Sixun Zheng
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    ABSTRACT: In this contribution, we reported the synthesis of a core-shell cylindrical brush copolymer with poly(2-hydroxyethyl methacrylate) (PHEMA) backbone and polystyrene-block-poly(ε-caprolactone) (PS-b-PCL) diblock side chains [denoted PHEMA-g-(PS-b-PCL)n] with the combination of atom transfer radical polymerization, the Huisgen 1,3-dipolar cycloaddition between azido and alkynyl groups and the ring-opening polymerization via a sequential "grafting from" polymerization approach. The cylindrical brush block copolymer was characterized by means of 1H nuclear magnetic resonance spectroscopy (NMR), gel permeation chromatography (GPC), atomic force microscopy (AFM) and differential scanning calorimetry (DSC). It is found that the fibrillar nanophases were formed with the length of about 400 nm and the diameter of about 15 nm via reaction-induced microphase separation mechanism while this cylindrical block copolymer brush was incorporated into epoxy thermosets. The fibrillar nanophases were characterized by means of transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS) and dynamic mechanical thermal analysis (DMTA). The formation of the fibrillar nanophases was interpreted on the basis of the constraint of cylindrical brush architecture of copolymer on reaction-induced microphase separation behavior.
    No preview · Article · Nov 2015 · Polymer
  • Houluo Cong · Lei Li · Sixun Zheng
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    ABSTRACT: Poly(ε-caprolactone)-block-polystyrene-block-poly(2,2,2-trifluoroethylacrylate (PCL-b-PS-b-PTFEA) and poly(ε-caprolactone)-block-poly(2,2,2-trifluoroethyl acrylate)-block-polystyrene (PCL-b-PTFEA-b-PS) triblock copolymers were synthesized via the combination of ring-opening polymerization (ROP) and reversible addition-fragmentation chain transfer (RAFT) polymerizations. Both of the triblock copolymers had the similar composition and molecular weights but different sequential structures. These two triblock copolymers were utilized to modulate the nanostructures of epoxy thermosets. It was found that the microdomains in the thermosets were formed through the mechanism of reaction-induced demixing of PS blocks in the presence of the self-assembled PTFEA microdomains. In the thermosets containing PCL-b-PS-b-PTFEA, the spherical and cylindrical microdomains with the core-shell structure were formed. In those containing PCL-b-PTFEA-b-PS, the spherical microdomains were formed but the size of the microdomains displayed a bimodal distribution. The difference in morphology is accounted for by the influence of sequential structures of the copolymers on the reaction-induced demixing behavior of the triblock copolymers in the epoxy thermosets.
    No preview · Article · Nov 2015
  • Wenjun Peng · Lei Li · Sixun Zheng
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    ABSTRACT: In this contribution, we reported the preparation of photoluminescent epoxy microspheres. First, diglycidyl ether of tetraphenylethene (DGETPE), a novel epoxy monomer bearing tetraphenylethene was synthesized and then it was incorporated into a commercial epoxy (viz. diglycidyl ether of bisphenol A) to obtain the epoxy microspheres with sizes of 1-3 μm via a phase-inverted reaction-induced phase separation approach. It was found that the epoxy microspheres were luminescent under UV light radiation. The surfaces of the photoluminescent epoxy microspheres were further functionalized with poly(N-vinyl pyrrolidone) (PVPy) with a grafting-from methodology via reversible addition-fragmentation chain transfer/macromolecular design via the interchange of xanthate (RAFT/MADIX) process. The PVPy-grafted epoxy microspheres can be well dispersed into aqueous solutions. The morphologies and photophysical properties of the epoxy microspheres were investigated by means of scanning electron microscopy, and UV-vis and fluorescence spectroscopy.
    No preview · Article · Sep 2015 · RSC Advances
  • Kun Wei · Ning Liu · Lei Li · Sixun Zheng
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    ABSTRACT: In this contribution, we report the synthesis of cis-hexa[(phenyl)(dimethylsiloxypropylglycidylether)cyclohexasiloxane, a novel macrocyclic oligomeric silsesquioxane (MOSS) via the combination of silylation and hydrosilylation reactions. This stereoregular MOSS macromer bearing epoxide groups was then incorporated into polybenzoxazine (PBZ) thermoset and the organic-inorganic nanocomposites were successfully obtained as evidenced by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Dynamic mechanical thermal analysis (DMTA) showed that the organic-inorganic nanocomposites displayed enhanced glass transition temperatures (Tg's) compared to plain PBZ. Thermogravimetric analysis (TGA) indicates that the organic-inorganic PBZ nanocomposites possessed improved thermal stability. The improved thermomechanical properties are attributable to the nanoreinforcement of the stereoregular macrocyclic silsesquioxanes on PBZ matrix as well as the additional crosslinking between PBZ and the MOSS macromer. The results of static contact angle measurement showed that the surface hydrophobicity of the organic-inorganic nanocomposites was significantly improved compared to the plain PBZ thermoset.
    No preview · Article · Sep 2015 · RSC Advances
  • Jingang Li · Yixin Xiang · Sixun Zheng
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    ABSTRACT: In this contribution, we reported the synthesis of a hyperbranched block copolymer composed of poly(ε-caprolactone) (PCL) and polystyrene (PS) subchains. Toward this end, we first synthesized an α-alkynyl- and ω,ω′-diazido-terminated PCL-b-(PS)2 macromonomer via the combination of ring-opening polymerization and atom transfer radical polymerization. By the use of this AB2 macromonomer, the hyperbranched block copolymer (h-[PCL-b-(PS)2]) was synthesized via a copper-catalyzed Huisgen 1,3-dipolar cycloaddition (i.e., click reaction) polymerization. The hyperbranched block copolymer was characterized by means of 1H nuclear magnetic resonance spectroscopy and gel permeation chromatography. Both differential scanning calorimetry and atomic force microscopy showed that the hyperbranched block copolymer was microphase-separated in bulk. While this hyperbranched block copolymer was incorporated into epoxy, the nanostructured thermosets were successfully obtained; the formation of the nanophases in epoxy followed reaction-induced microphase separation mechanism as evidenced by atomic force microscopy, small angle X-ray scattering, and dynamic mechanical thermal analysis. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015
    No preview · Article · Aug 2015 · Journal of Polymer Science Part A Polymer Chemistry
  • Jingang Li · Houluo Cong · Lei Li · Sixun Zheng
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    ABSTRACT: The nanostructured thermosets containing poly(3-hexylthiophene) (P3HT) nanophases were prepared by incorporating poly(ε-caprolactone)-block-poly(3-hexylthiophene)-block-poly(ε-caprolactone) (PCL-b-P3HT-b-PCL) triblock copolymer into epoxy. The PCL-b-P3HT-b-PCL triblock copolymer was synthesized via the combination of the polycondensation of 2-bromo-3-hexyl-5-iodothiophene and the ring-opening polymerization of ε-caprolactone; it was characterized by means of 1H nuclear magnetic resonance spectroscopy (1H NMR), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). The morphologies of the nanostructured thermosets were investigated by means of transmission electron microscopy (TEM), small angle X-ray scattering (SAXS) and dynamic mechanical thermal analysis (DMTA). The results of small angle X-ray scattering (SAXS) showed that the P3HT nanophases were formed via self-assembly mechanism of the triblock copolymer in epoxy thermosets. Compared to control epoxy, the nanostructured thermosets containing the conjugated nanophases significantly displayed the enhanced dielectric constants. In the meantime, the thermal conductivity of the nanostructured thermosets was also enhanced and increased with increasing the content of P3HT nanophases.
    No preview · Article · Jul 2015 · Polymer
  • Rentong Yu · Sixun Zheng
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    ABSTRACT: In this work, we reported a facile preparation of mesoporous silica materials assisted by a commercial polystyrene-block-polybutadiene-block-polystyrene (PS-b-PB-b-PS) triblock copolymer. For this purpose, the PS-b-PB-b-PS triblock copolymer was first functionalized with (3-mercaptopropyl)triethoxysilane via a thiol-ene radical addition approach, and then the functionalized triblock copolymer with the midblock bearing triethoxysilane moieties was employed to perform intercomponent sol–gel reactions with tetraethoxysilane (TEOS) to obtain the organic–inorganic gels. The organic–inorganic gels with variable compositions were then used as precursors to obtain mesoporous silica via pyrolysis at elevated temperatures. The functionalized triblock copolymer was characterized by means of Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, and small-angle X-ray scattering (SAXS). The results of SAXS, transmission electron microscopy, and Brunauer–Emmett–Teller measurements indicate that the mesoporous silica materials were successfully obtained and the porosity of the materials can be modulated with the mass ratios of the functionalized triblock copolymer to the precursor of silica (viz. TEOS).
    No preview · Article · Jun 2015 · Industrial & Engineering Chemistry Research
  • Chongyin Zhang · Ning Liu · Lei Li · Lei Wang · Sixun Zheng
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    ABSTRACT: 3,13-Diglycidyloxypropyloctaphenyl double-decker silsesquioxane (3,13-diglydidyl DDSQ) was synthesized via hydrosilylation between 3,13-dihydrooctaphenyl double-decker silsesquioxane (3,13-dihydro DDSQ) and allyl glycidyl ether. This novel difunctional polyhedral oligomeric silsesquioxanes (POSS) macromer was incorporated into polybenzoxazine (PBZ) thermosets to obtain the organic–inorganic nanocomposites. Compared to control PBZ, the organic–inorganic nanocomposites displayed the enhanced glass transition temperatures (Tg's). Under the identical condition, the organic–inorganic nanocomposites exhibited the stable rubbery plateaus in the measurements by dynamic mechanical thermal analysis, which was in marked contrast to control PBZ thermoset. The enhanced Tg's and improved dynamic mechanical properties are attributable to the formation of the additional crosslinking between PBZ and the difunctional POSS macromer and the nanoreinforcement of POSS cages on PBZ networks. Thermogravimetric analysis indicates that the organic–inorganic nanocomposites displayed improved thermal stability. POLYM. COMPOS., 2015. © 2015 Society of Plastics Engineers
    No preview · Article · Jun 2015 · Polymer Composites
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    Lei Li · Sixun Zheng
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    ABSTRACT: Poly(ε-caprolactone)-grafted magnetic iron oxide nanoparticles (Fe3O4 NPs) were prepared via a surface-initiated ring opening polymerization approach. First, the surface of the unmodified Fe3O4 NPs were treated with 3-aminopropyltriethoxysilane to afford the 3-aminopropyl-functionalzed Fe3O4 NPs. Second, the surface-initiated ring-opening polymerization of ε-caprolactone was carried out with the surface-functionalized Fe3O4 NPs as the initiator to afford the poly(ε-caprolactone)(PCL)-grafted Fe3O4 NPs. The PCL-grafted Fe3O4 NPs have been characterized by means of Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and transmission electron microscopy. It was found that the PCL-grafted Fe3O4 NPs can be well dispersed into epoxy thermosets. The nanocomposites were successfully obtained with the content of the PCL-grafted Fe3O4 NPs up to 40 wt %. The fine dispersion of Fe3O4 nanoparticles in epoxy was demonstrated by transmission electron microscopy and dynamic mechanical thermal analysis. The results of magnetic analysis with vibrating sample measuring technology indicated that the nanocomposites involving epoxy resins and Fe3O4 nanoparticles possessed superparamagnetic properties.
    Preview · Article · Jan 2015 · Industrial & Engineering Chemistry Research
  • Houluo Cong · Jingang Li · Lei Li · Sixun Zheng
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    ABSTRACT: Poly(ethylene oxide)-block-poly(sodium p-styrenesulfonate) (PEO-b-PSSNa) diblock copolymer was synthesized and then incorporated into epoxy to obtain the nanostructured epoxy thermosets containing polyelectrolyte nanophases. This PEO-b-PSSNa diblock copolymer was synthesized via the radical polymerization of p-styrenesulfonate mediated with 4-cyano-4-(thiobenzoylthio)valeric ester-terminated poly(ethylene oxide). The formation of polyelectrolyte (i.e., PSSNa) nanophases in epoxy followed a self-assembly mechanism. The precursors of epoxy acted as the selective solvent of the diblock copolymer, and thus, the self-assembled nanostructures were formed. The self-organized nanophases were fixed through the subsequent curing reaction. By means of transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS), the morphologies of the nanostructured epoxy thermosets containing PSSNa nanophases were investigated. In the glassy state, the epoxy matrixes were significantly reinforced by the spherical PSSNa nanodomains, as evidenced by dynamic mechanical analysis. The measurement of dielectric properties showed that, with the incorporation of PSSNa nanophases, the dielectric constants of the epoxy thermoset were significantly increased. Compared to the control epoxy, the dielectric loss of the nanostructured thermosets still remained at quite a low level, although the values of dielectric loss were slightly increased with inclusion of PSSNa nanophases.
    No preview · Article · Dec 2014 · The Journal of Physical Chemistry B
  • Houluo Cong · Jingang Li · Lei Li · Sixun Zheng
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    ABSTRACT: In this contribution, we reported the synthesis of poly(N-isopropylacrylamide)-block-poly(N-vinylpyrrolidone)-block-poly(N-isopropylacrylamide) (PNIPAM-b-PVP-b-PNIPAM) triblock copolymers through sequential reversible addition–fragmentation chain transfer/macromolecular design via the interchange of xanthate (RAFT/MADIX) process. The triblock copolymers have been characterized by means of 1H nuclear magnetic resonance (NMR) spectroscopy, gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). This ABA triblock copolymer displayed a typical thermoresponsive gelation behavior. In this work, the thermoresponsive gelation behavior was investigated by means of rheological measurements, micro-differential scanning calorimetry (Micro-DSC) and small angle X-ray scattering (SAXS). The thermoresponsive gelation behavior could endow the triblock copolymers with the potential application as injectable hydrogels.
    No preview · Article · Dec 2014 · European Polymer Journal
  • Houluo Cong · Sixun Zheng
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    ABSTRACT: In this contribution, we reported the synthesis of poly(N-isopropylacrylamide)-block-poly(acrylic acid) (PNIPAAm-b-PAA) copolymer networks via sequential reversible addition-fragmentation chain transfer (RAFT) polymerization. The PNIPAAm-b-PAA block copolymer networks were characterized by means of Fourier transform infrared spectroscopy (FTIR) and small angle X-ray scattering (SAXS). The volume phase transition (VPT) temperatures of the PNIPAAm-b-PAA hydrogels were measured by means of micro-differential scanning calorimetry (micro-DSC). It was found that the block copolymer hydrogels displayed the VPT temperatures lower than the control PNIPAAm hydrogel. Compared to the control PNIPAAm hydrogel, the deswelling and reswelling properties of the block copolymer hydrogels were significantly improved. The improved thermoresponsive properties of the PNIPAAm-b-PAA hydrogels have been interpreted on the basis of the formation of the architecture of the block copolymer networks.
    No preview · Article · Oct 2014 · Colloid and Polymer Science
  • Kun Wei · Lei Wang · Lei Li · Sixun Zheng
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    ABSTRACT: Bead-like PNIPAAm copolymers with double-decker silsesquioxane (DDSQ) in the main chains were synthesized via a reversible addition–fragmentation chain transfer (RAFT) polymerization approach. The macromolecular chain transfer agent used for the RAFT polymerization was synthesized via the polycondensation of 3,13-dihydroxyproplyl DDSQ with S,S′-bis(α,α′-dimethyl-α′′-propargyl acetate)trithiocarbonate. The organic–inorganic copolymers with variable contents of DDSQ were characterized by means of 1H nuclear magnetic resonance spectroscopy and gel permeation chromatography. Transmission electron microscopy showed that the bead-like PNIPAAm copolymers were microphase-separated in bulk. It was found that the glass transition temperatures (Tg's) of PNIPAAm microdomains of the organic–inorganic copolymers were lower than plain PNIPAAm and decreased with increasing the content of DDSQ. The bead-like PNIPAAm copolymers displayed the self-assembly behavior in aqueous solutions. Depending on the content of DDSQ, the bead-like organic–inorganic copolymers can self-assemble into spherical or vesicular nanoobjects in aqueous solutions. Both micro-differential scanning calorimetry (Micro-DSC) and cloud point analysis with UV-vis spectroscopy showed that the lower critical solution temperature (LCST) behavior of PNIPAAm subchains in the bead-like copolymers was significantly affected by the POSS cages in the main chains.
    No preview · Article · Sep 2014
  • Yulin Yi · Lei Li · Sixun Zheng
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    ABSTRACT: Poly(epsilon-caprolactone)-block-poly(N-vinyl pyrrolidone) diblock copolymers grafted from macrocyclic oligomeric silsesquioxane (MOSS) (denoted MOSS[PCL-b-PVPy](12)) were synthesized via the sequential polymerizations involving ring-opening polymerization (ROP) of epsilon-caprolactone (CL) and RAFT/MADIX polymerization of N-vinyl pyrrolidone (NVP). The organic-inorganic brush-like diblock copolymers were characterized by means of nuclear magnetic resonance spectroscopy (NMR) and gel permeation chromatography (GPC). Small angle X-ray scattering (SAXS) showed that all the MOSS[PCL-b-PVPy](12) was microphase-separated in the amorphous state. The microphase-separated morphologies were quite dependent on the length of PVPy blocks and the crystallization behavior of PCL subchains was significantly affected by the lengths of PVPy subchains. In aqueous solutions, the MOSS[PCL-b-PVPy](12) can be self-assembled into the polymeric micelles as evidenced by dynamic light scattering (DLS) and transmission election microscopy (TEM). The critical micelle concentrations of the brush-like diblock copolymers increased with increasing the lengths of PVPy blocks. It is proposed that the stability of the micellar cores was increased with the macrocyclic molecular brush structure of the diblock copolymers and the formation of the MOSS aggregates via MOSS MOSS interactions.
    No preview · Article · Aug 2014 · Polymer
  • Jingang Li · Houluo Cong · Lei Li · Sixun Zheng
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    ABSTRACT: The block copolymer networks composed of poly(N-isopropylacrylamide) (PNIPAM) and poly(sodium p-styrenesulfonate) were synthesized via sequential reversible addition-fragmentation chain transfer (RAFT) polymerization with α,ω-didithiobenzoate-terminated poly(sodium p-styrenesulfonate) (PSSNa) as the macromolecular chain transfer agent. It was found that the block copolymer networks were microphase-separated as evidenced by means of transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). In the block copolymer networks, spherical or cylindrical PSSNa microdomains were finely dispersed into continuous PNIPAM matrixes. In comparison with unmodified PNIPAM hydrogel, the nanostructured hydrogels displayed improved thermoresponsive properties. In addition, the swelling ratios of the PSSNa-modified PNIPAM hydrogels were significantly higher than that of plain PNIPAM hydrogel. The improvement of thermoresponse was attributable to the formation of the PSSNa nanophases, which promoted the transportation of water molecules in the cross-linked networks.
    No preview · Article · Jul 2014 · ACS Applied Materials & Interfaces
  • Yulin Yi · Sixun Zheng
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    ABSTRACT: The novel organic-inorganic molecular brush composed of macrocyclic oligomeric silsesquioxane (MOSS) and poly(N-isopropylacrylamide) PNIPAAm) denoted by PNIPAAm@MOSS) was synthesized via the atom transfer radical polymerization ATRP) approach. In bulk, the organic-inorganic molecular brushes were microphase-separated; the spherical MOSS microdomains with the diameter of 10-50 nm were dispersed into a continuous PNIPAAm matrix. Depending on the lengths of PNIPAAm chains, the PNIPAAm@ MOSS molecular brushes were capable of self-assembling into cylindrical or spherical nano-objects in aqueous solutions as evidenced by transmission election microscopy TEM) and dynamic light scattering DLS). Both micro-differential scanning calorimetry (Micro-DSC) and ultraviolet-visible spectroscopy showed that the MOSS backbones exerted significant restriction of coil-to-globule transition of PNIPAAm chains.
    No preview · Article · Jun 2014 · RSC Advances
  • Chongyin Zhang · Lei Li · Houluo Cong · Sixun Zheng
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    ABSTRACT: In this contribution, we reported a facile synthesis of poly(methyl methacrylate)-block-poly(N-vinyl pyrrolidone) (PMMA-b-PVPy) diblock copolymers via sequential radical polymerizations mediated by isopropylxanthic disulfide (DIP). It was found that the radical polymerization of N-vinyl pyrrolidone (NVP) mediated by DIP was in a controlled and living manner. In contrast, the polymerization of methyl methacrylate mediated by DIP displayed the behavior of telomerization, affording xanthate-terminated PMMA with a good control of molecular weights while the conversion of monomer was not very high. The xanthate-terminated PMMA can be successfully used as the macromolecular chain transfer agent for the polymerization of NVP via RAFT/MADIX process and thus PMMA-b-PVPy diblock copolymers can be successfully synthesized via sequential radical polymerization mediated by isopropylxanthic disulfide. One of these diblock copolymers was incorporated into polybenzoxazine and the nanostructured thermosets were obtained as evidenced by transmission electron microscopy, small angle X-ray scattering, and dynamic mechanical thermal analysis. The formation of nanostructures in polybenzoxazine thermosets was ascribed to a reaction-induced microphase separation mechanism. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014
    No preview · Article · Apr 2014 · Journal of Polymer Science Part A Polymer Chemistry

Publication Stats

4k Citations
564.73 Total Impact Points

Institutions

  • 2003-2015
    • Shanghai Jiao Tong University
      • Department of Polymer Science and Engineering
      Shanghai, Shanghai Shi, China
  • 1998-2003
    • The Hong Kong University of Science and Technology
      Chiu-lung, Kowloon City, Hong Kong
  • 1995-2001
    • University of Science and Technology of China
      • • Department of Polymer Science and Engineering
      • • Department of Materials Science and Engineering
      Luchow, Anhui Sheng, China