高级检索

    董佳豪, 潘威豪, 陶俊杰, 罗静. Pickering乳液模板法制备pH响应型双重防腐蚀功能微胶囊[J]. 功能高分子学报, 2020, 33(4): 357-364. doi: 10.14133/j.cnki.1008-9357.20191115002
    引用本文: 董佳豪, 潘威豪, 陶俊杰, 罗静. Pickering乳液模板法制备pH响应型双重防腐蚀功能微胶囊[J]. 功能高分子学报, 2020, 33(4): 357-364. doi: 10.14133/j.cnki.1008-9357.20191115002
    DONG Jiahao, PAN Weihao, TAO Junjie, LUO Jing. Preparation of pH-Responsive Microcapsules with Dual Anti-Corrosion Function via Pickering Emulsion Template[J]. Journal of Functional Polymers, 2020, 33(4): 357-364. doi: 10.14133/j.cnki.1008-9357.20191115002
    Citation: DONG Jiahao, PAN Weihao, TAO Junjie, LUO Jing. Preparation of pH-Responsive Microcapsules with Dual Anti-Corrosion Function via Pickering Emulsion Template[J]. Journal of Functional Polymers, 2020, 33(4): 357-364. doi: 10.14133/j.cnki.1008-9357.20191115002

    Pickering乳液模板法制备pH响应型双重防腐蚀功能微胶囊

    Preparation of pH-Responsive Microcapsules with Dual Anti-Corrosion Function via Pickering Emulsion Template

    • 摘要: 首先以SiO2纳米粒子作为Pickering乳化剂稳定含有苯胺、甲基丙烯酸缩水甘油酯(GMA)和1,6-己二醇二丙烯酸酯(HDDA)的油相;然后以紫外光引发GMA和HDDA聚合,在油水界面快速形成聚甲基丙烯酸缩水甘油酯(PGMA)壳层;最后加入过硫酸铵引发苯胺在油水界面的化学氧化聚合形成聚苯胺(PANI)壳层,从而得到PGMA@PANI微胶囊。该微胶囊具有复合壳层结构,PGMA壳层可以稳定乳液滴形貌并提高微胶囊韧性,PANI壳层赋予微胶囊防腐及pH响应释放性能。在PGMA@PANI微胶囊内部负载缓蚀剂2-巯基苯并噻唑(MBT)后形成的MBT-PGMA@PANI微胶囊具备双重防腐蚀功能。电化学阻抗谱测试研究表明将MBT-PGMA@PANI微胶囊添加到环氧树脂涂层中可显著提高涂层的防腐蚀性能。

       

      Abstract: A novel type of microcapsule with pH-responsive release and anti-corrosion function was prepared via the UV-initiated polymerization and interfacial polymerization of Pickering emulsion. Then the microcapsule was loaded with corrosion inhibitor 2-mercaptobenzothiazole (MBT) and embedded into epoxy coating for enhancing the anti-corrosion performance of coating. SiO2 nanoparticles were used as the Pickering emulsifier to stabilize the oil phase of emulsion, which contained aniline, glycidyl methacrylate (GMA) and 1,6-hexanediol diacrylate (HDDA). GMA and HDDA underwent crosslinking along with the interior of the emulsion droplets and formed the first shell of microcapsule initiated by UV light. The polyaniline (PANI) was synthesized subsequently via chemical oxidative polymerization of aniline initiated by ammonium persulfate (APS) and acted as the second functional layer of microcapsule shell material. The shell of the as-prepared PGMA@PANI microcapsule is thus of composite structure. The PGMA shell stabilized the morphology of the emulsion droplets and improved the robustness of the microcapsule. The PANI shell functioned as anti-corrosion filler and a pH-sensitive gatekeeper to realize the responsive release of corrosion inhibitor. After being loaded MBT, the MBT-PGMA@PANI microcapsule could achieve dual anti-corrosion function. PANI could passivate the steel and released MBT could form dense barrier layer on the steel surface to resist corrosive medium. Electrochemical impedance spectroscopy (EIS) was used to test the performance of coating. The Bode plots showed that the impedance values at low frequency (|Z|f=0.1 Hz) of coating with 1% mass fracion of MBT-PGMA@PANI microcapsule could be maintain above 108 Ω·cm2 after immersed in NaCl solution (w=3.5%) for 30 d, demonstrating significant improvement of anti-corrosion performance.

       

    /

    返回文章
    返回