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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.


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.


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.


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.


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.

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