Journal of Guangxi Teachers Education University (Philosophy and Social Sciences Edition) ›› 2019, Vol. 37 ›› Issue (3): 120-131.doi: 10.16088/j.issn.1001-6600.2019.03.014

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Polymethyl Methacrylate Modified Nano-Silica and Its Stabilizing Effect on Pickering Emulsion

WU Juan1, ZHU Hongyang1, MEI Ping1,2*, CHEN Wu1,2, LI Zhongbao1   

  1. 1.College of Chemical and Environmental Engineering, Yangtze University, Jingzhou Hubei 434023, China;
    2.Hubei Cooperative Innovation Center of Unconventional Oil and Gas Yangtze University , Wuhan Hubei 434100, China
  • Published:2019-07-12

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Abstract: The γ-methacryloxypropyl-trimethoxysilane (MPS) was used to modify hydrophilic nano-silica to obtain MPS-SiO2 nanoparticles, and the PMMA-SiO2 nanoparticles were prepared by further modification of MPS-SiO2 nanoparticles with methyl methacrylate (MMA). Results of FTIR spectra and contact angle measurement show that the surfaces of hydrophilic nano-silica are successfully grafted with MPS and MMA. In addition, Pickering emulsions were prepared based on hydrophilic nano-silica, MPS-SiO2, PMMA-SiO2 and hydrophobic nano-silica, respectively. The effects of the volume ratio of oil to water, the concentration of nano-silica, pH value of aqueous solution and the concentration of NaCl on the stability of Pickering emulsions were investigated. The volume fractions of residual emulsions, of which were placed for 24h and prepared with a mass fraction of 1% of hydrophilic nano-SiO2, MPS-SiO2 and PMMA-SiO2, are 48%, 80% and 76%, respectively. The results indicate that the emulsifying performance of MPS-SiO2 and PMMA-SiO2 are better than that of hydrophilic nano-SiO2. The optimum volume ratio of oil to water for Pickering emulsions prepared by hydrophilic nano-silica, MPS-SiO2 and PMMA-SiO2 are all 1∶1, while for hydrophobic nano-silica, that is 1∶2. Moreover, the emulsification properties of four kinds of nano-silica particles enhance with the increase of their concentrations. Compared with the other three nanoparticles, the stability of Pickering emulsion prepared by PMMA-SiO2 is less affected by pH and the concentration of NaCl.

Key words: nano-silica, PMMA modification, Pickering emulsions, emulsion stability

CLC Number: 

  • O632.5
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