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Zhao D.,Hefei University of Technology | Wang M.-Z.,Hefei University of Technology | Wu Q.-C.,Guangdong Tianan New Material Co. | Zhou X.,Guangdong Tianan New Material Co. | Ge X.-W.,Hefei University of Technology
Chinese Journal of Chemical Physics | Year: 2014

UV-curable polyurethane prepolymer and photoinitiator 1173 were facilely encapsulated in a poly(urea-formaldehyde) shell, which was in situ formed by the polymerization of formaldehyde and urea in an oil-in-water emulsion. The diameters of the microcapsules ranged from 118 μm to 663 μm depending on agitation speed, and were obtained via optical microscopy and scanning electron microscopy analyses. The encapsulation percent and the yield of microcapsules prepared at the agitation speed of 600 r/min can reach 97.52wt% and 65.23wt%, respectively. When the water-borne polyurethane (WPU) coating embedded with the prepared microcapsules were scratched, the healing agent could be released from ruptured microcapsules and filled the scribed region. The excellent anticorrosion properties of the WPU coating embedded with the prepared microcapsules were confirmed by the results obtained from both electrochemical impedance spectroscopy and Tafel curves. ©2014 Chinese Physical Society.


Wang Y.-L.,Hefei University of Technology | Wang M.-Z.,Hefei University of Technology | Wu Q.-C.,Guangdong Tianan New Material Co. | Zhou X.,Guangdong Tianan New Material Co. | Ge X.-W.,Hefei University of Technology
Chinese Journal of Chemical Physics | Year: 2014

The simultaneous γ-ray-radiation-induced grafting polymerization of acrylic acid on expanded polytetrafluoroethylene (ePTFE) film was investigated. It was found that the degree of grafting (DG) of poly(acrylic acid) (PAA) can be controlled by the monomer concentration, absorbed dose, and dose rate under an optimal inhibitor concentration of [Fe2+]=18 mmol/L. SEM observation showed that the macroporous structure in ePTFE films would be covered gradually with the increase of the DG of PAA. The prepared ePTFE-g-PAA film was immersed in a neutral silver nitrate solution to fabricate an ePTFE-g-PAA/Ag hybrid film after the addition of NaBH4 as a reduction agent of Ag+ to Ag atom. SEM, XRD, and XPS results proved that Ag nanoparticles with a size of several tens of nanometers to 100 nanometers were in situ immobilized on ePTFE film. The loading capacity of Ag nanoparticles could be tuned by the DG of PAA, and determined by thermal gravimetric analysis. The quantitative antibacterial activity of the obtained ePTFE-g-PAA/Ag hybrid films was measured using counting plate method. It can kill all the Escherichia coli in the suspension in 1 h. Moreover, this excellent antibacterial activity can last at least for 4 h. This work provides a facile and practical way to make ePTFE meet the demanding antimicrobial requirement in more and more practical application areas. © 2015 Chinese Physical Society.


Xu Y.-F.,Hefei University of Technology | Xu Y.-F.,Anhui University | Wang M.-Z.,Hefei University of Technology | Wu Q.-C.,Guangdong Tianan New Material Co. | And 2 more authors.
Chinese Chemical Letters | Year: 2015

The fabrication of raspberry-like poly(ethylene terephthalate)/polyacrylonitrile (PET/PAN) microspheres by γ-ray radiation-induced polymerization of acrylonitrile on micron-sized PET microspheres were first reported in this work. A PET emulsion was firstly prepared by dispersing a PET solution with 1,1,2,2-tetrachloroethane/phenol mixture as the solvent into an aqueous solution of sodium dodecyl sulfate. Then, PET microspheres were formed by precipitating the PET emulsion droplets from ethanol. The influence of the PET solvent and the weight ratio of ethanol to PET emulsion on the morphology of the PET microspheres had been investigated. After the surface of the prepared PET microspheres was grafted with poly(acrylic acid), the grafting polymerization of AN also had been successfully initiated by γ-ray radiation to form PAN microspheres with a size of about 100. nm on the PET microspheres. This work provides a new method to fabricate micron-sized PET microspheres, and further expands the functionalization of PET and its application fields. © 2016 Mo-Zhen Wang.


Chen J.,Anhui University of Science and Technology | Chen F.,Anhui University of Science and Technology | Wang Y.,Anhui University of Science and Technology | Wang M.,Anhui University of Science and Technology | And 3 more authors.
RSC Advances | Year: 2016

A sub-micron sized highly-crosslinked poly(ethyleneglycol dimethacrylate) (PEGDMA) microsphere supported nano-Au catalyst (PEGDMA@AuNP) was successfully prepared through a one-step synthesis method at room temperature and ambient pressure, taking advantage of the γ-ray radiation effect on a simple one-pot system, i.e. a methanol-water solution containing EGDMA, 4-VP, and HAuCl4. Electron microscopy, XPS, and XRD analyses proved that AuNPs of several nanometers had been synthesized and loaded simultaneously with the formation of crosslinked PEGDMA microspheres when the adsorbed dose rate and the initial concentration of HAuCl4 were controlled within a narrow range, i.e. 35-80 Gy min-1 and below 1 mmol L-1 of [HAuCl4]. The size of the prepared PEGDMA@AuNP microspheres changed little with the dose rate, but decreased with the initial [HAuCl4], from 900 nm at 0.1 mmol L-1 to 680 nm at 1 mmol L-1. At the same time, the size of AuNPs increases with the initial [HAuCl4], from 8 nm at 0.1 mmol L-1 to 35 nm at 1 mmol L-1. The prepared PEGDMA@AuNP microspheres can be dispersed stably in both water and organic solvent, CH3CN. They exhibit excellent catalytic efficiency not only on the reduction of Fe(CN)6 3- by NaBH4 in aqueous solution, but also on the cis-trans isomerization of azobenzenes in CH3CN at room temperature. A satisfactory repeatability of the catalytic performance of the prepared PEGDMA@AuNP microspheres was achieved in organic solvents. This work opens a new green simple and economic way to the synthesis of efficient and chemically-stable polymer-supported nano-metal catalysts. © 2016 The Royal Society of Chemistry.


Xie L.,Anhui University of Science and Technology | Duan G.,Anhui University of Science and Technology | Wang W.,Anhui University of Science and Technology | Wang M.,Anhui University of Science and Technology | And 3 more authors.
Industrial and Engineering Chemistry Research | Year: 2016

The surface modification of graphene oxide (GO) determines the interactions between GO and polymers, which possibly produces a significant impact on the mechanical properties of polymer. Here, GO was first modified with poly(glycidyl methacrylate) (PGMA) and triethylenetetramine (TTA) through γ-ray radiation. Then, a tiny small amount (0.04%) of the prepared modified GO was filled with a PET/ethylene-methyl acrylate-glycidyl methacrylate random terpolymer (PET/ST2000) blend. The morphological analyses on these filled PET blends confirmed that the surface chemical structure of GO had a crucial impact on the mechanical property of the blend. The chemical bonding between GO and ST2000 was more efficient in improving the dispersibility of GO and the compatibility between PET and ST2000, leading to a 2.5-fold increase in the impact strength, along with a slight increase in tensile strength. However, the addition of reduced GO lacking polar groups caused fatal damage in the mechanical property of the blend. © 2016 American Chemical Society.


Xie L.,Anhui University of Science and Technology | Xie Y.,Anhui University of Science and Technology | Wu Q.,Anhui University of Science and Technology | Wang M.,Anhui University of Science and Technology | And 3 more authors.
Industrial and Engineering Chemistry Research | Year: 2015

The preparation of supertoughening poly(ethylene terephthalate) (PET) blends has always been a practical and valuable task. In our work, PET resins grafted with poly(acrylic acid) (PAA), termed as PET-g-PAA, were first prepared through γ-ray radiation induced graft polymerization and blended in a partially miscible PET/ethylene-methyl acrylate-glycidyl methacrylate random terpolymer (ST2000) system as the compatibilizer. The impact strength of the PET blends achieves the maximum at a 6 wt % of PET-g-PAA, but without the loss of tensile strength. Furthermore, much less of ST2000 is needed for the blends to possess high impact strength at the existence of PET-g-PAA. The SEM morphological analysis of the impact-fracture surface implies a good interfacial adhesion between ST2000 and PET matrix, which should be ascribed to the effective compatibilization by the in situ formed PET-g-PAA/ST2000 graft copolymer through the reaction between the -COOH groups and epoxy groups on ST2000. © 2015 American Chemical Society.


Wang Y.,Anhui University of Science and Technology | Zhao C.,Anhui University of Science and Technology | Wang M.,Anhui University of Science and Technology | Wu Q.,Guangdong Tianan New Material Co. | And 2 more authors.
Macromolecular Materials and Engineering | Year: 2016

This work reports a simple and efficient preparation method of an inverse-opal-like macroporous polytetrafluoroethylene (IO-PTFE) film with a reusable matrix. At first, the pH-responsive poly(acrylic acid) (PAA) is grafted on the PTFE latex particles induced by γ-ray radiation. The stability of PAA grafted PTFE latex particles (PTFE-g-PAA) in water decreases in acid aqueous solution. As a result, PTFE-g-PAA particles can coprecipitate with monodispersed polystyrene (PS) microspheres from the acidic aqueous dispersion to form a composite particulate film. After the composite particulate film is etched with toluene to remove PS microspheres, a self-stand inverse-opal-like macroporous PTFE film can be successfully obtained. The macroporous PTFE film can be applied as the microreactor to synthesize uniform TiO2 particles. The separation of TiO2 microparticles and the recycle of PTFE-g-PAA particles can be simultaneously achieved simply in water by means of ultrasonification. The prepared TiO2 microparticles also show good photocatalytic performance. This work opens a new thought to prepare special macroporous polymeric materials, and expands the microsynthesis of inorganic or organic microparticles by taking advantage of polymeric macroporous materials. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Xu Y.,Anhui University of Science and Technology | Wang Y.,Anhui University of Science and Technology | Wang M.,Anhui University of Science and Technology | Wu Q.,Guangdong Tianan New Material Co. | And 2 more authors.
Radiation Physics and Chemistry | Year: 2015

Poly(ethylene terephthalate)-g-polyacrylonitrile (PET-g-PAN) composite film with a porous surface was fabricated via gamma-ray-radiation-induced graft polymerization on PET film in an aqueous solution system. The original PET film was first irradiated by gamma ray in the aqueous solution of acrylic acid. Next, the graft polymerization of acrylonitrile (AN) was induced by gamma ray on the surface of the above modified PET film in an aqueous solution of AN. The prepared PET-g-PAN composite film has a smaller static water contact angle than the original PET film. The SEM and AFM images show that the grafted PAN layer on the surface of PET-g-PAN composite film is composed of closely-arranged spherical PAN microspheres with an average diameter of 30. nm. The gaps between the PAN microspheres form fine pores (less than 30. nm) on the surface. The gas barrier property of the PET-g-PAN composite film is much better than that of the original PET film. This work provides a facile and green method to prepare PET-g-PAN composite film with a controllable porous surface morphology by taking advantage of the radiation-induced graft polymerization technique in an aqueous solution system. © 2014 Elsevier Ltd.

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