《广西师范大学学报》（哲学社会科学版） ›› 2019, Vol. 37 ›› Issue (3): 120-131.doi: 10.16088/j.issn.1001-6600.2019.03.014

• • 上一篇    

聚甲基丙烯酸甲酯改性纳米SiO2及其Pickering乳液稳定性

吴娟1,朱宏阳1,梅平1,2*,陈武1,2,李中宝1   

  1. 1.长江大学化学与环境工程学院,湖北荆州434023;
    2.非常规油气湖北省协同创新中心长江大学,湖北武汉430100
  • 发布日期:2019-07-12
  • 通讯作者: 梅平(1961—),男,湖北天门人,长江大学教授。E-mail: meipinghb@126.com
  • 基金资助:
    国家自然科学基金青年基金(21403017)

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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摘要： 采用γ-甲基丙烯酰氧基丙基三甲氧基硅烷(MPS)对亲水型纳米SiO2改性得到了MPS-SiO2纳米粒子,将MPS-SiO2纳米粒子进一步通过甲基丙烯酸甲酯(MMA)改性得到了PMMA-SiO2纳米粒子。傅里叶转换红外光谱分析(FT-IR)和接触角测试表明纳米SiO2改性成功。以亲水型纳米SiO2、MPS-SiO2、PMMA-SiO2、疏水型纳米SiO2 4种粒子作为乳化剂制备Pickering 乳液,研究了油水比(体积比,全文同)、纳米SiO2浓度、pH值、盐浓度对Pickering 乳液稳定性的影响。结果显示:静置24 h后,油水比为1∶1时,质量分数为1%的亲水型纳米SiO2、MPS-SiO2、PMMA-SiO2制备的乳液剩余体积分数依次为48%、80%、76%,表明2种改性后的纳米SiO2 的乳化性能显著增强;亲水型纳米SiO2、MPS-SiO2、PMMA-SiO2制备的Pickering 乳液最佳油水比为1∶1,疏水型纳米SiO2制备的Pickering 乳液最佳油水比为1∶2;4种纳米SiO2 粒子的乳化性能均随着其浓度的增加而增强;与其他3种粒子相比,PMMA-SiO2 制备的Pickering 乳液受pH、盐浓度的影响较小。

关键词: 纳米SiO2, PMMA改性, Pickering乳液, 乳液稳定性

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

中图分类号: 

  • O632.5
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