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十四酸改性SiO2/超支化PDMS自修复涂层的制备及其超疏水性能

朱航 刘静 雷西萍 田甜 宋晓琪

朱航, 刘静, 雷西萍, 等. 十四酸改性SiO2/超支化PDMS自修复涂层的制备及其超疏水性能[J]. 复合材料学报, 2024, 41(1): 227-239. doi: 10.13801/j.cnki.fhclxb.20230511.001
引用本文: 朱航, 刘静, 雷西萍, 等. 十四酸改性SiO2/超支化PDMS自修复涂层的制备及其超疏水性能[J]. 复合材料学报, 2024, 41(1): 227-239. doi: 10.13801/j.cnki.fhclxb.20230511.001
ZHU Hang, LIU Jing, LEI Xiping, et al. Preparation of myristic acid modified SiO2/hyperbranched-PDMS self-healing coating and its superhydrophobic performance[J]. Acta Materiae Compositae Sinica, 2024, 41(1): 227-239. doi: 10.13801/j.cnki.fhclxb.20230511.001
Citation: ZHU Hang, LIU Jing, LEI Xiping, et al. Preparation of myristic acid modified SiO2/hyperbranched-PDMS self-healing coating and its superhydrophobic performance[J]. Acta Materiae Compositae Sinica, 2024, 41(1): 227-239. doi: 10.13801/j.cnki.fhclxb.20230511.001

十四酸改性SiO2/超支化PDMS自修复涂层的制备及其超疏水性能

doi: 10.13801/j.cnki.fhclxb.20230511.001
基金项目: 西安建筑科技大学基础研究基金(ZR21026);校级基础研究基金(1609722026)
详细信息
    通讯作者:

    雷西萍,博士,教授,博士生导师,研究方向为超疏水材料 E-mail: leixiping123456@163.com

  • 中图分类号: TB332

Preparation of myristic acid modified SiO2/hyperbranched-PDMS self-healing coating and its superhydrophobic performance

Funds: Fundamental Research Fund of Xi'an University of Architecture and Technology (ZR21026); University Basic Research Fund (1609722026)
  • 摘要: 为了提高超疏水涂层的耐久性,通过设计“基底-黏性自修复聚合物-疏水粒子”自下而上的涂层体系,制备了具有自修复功能的超疏水表面:以含有丰富氢键的超支化聚硅氧烷(HB-PDMS)作为黏性自修复聚合物,通过十四酸(MA)对纳米SiO2进行疏水改性作为疏水粒子以构筑表面粗糙结构。探究了SiO2改性的最佳工艺:当MA与SiO2质量比为1∶1,改性时间为3 h时,所制备的超疏水涂层接触角为152.61°,滚动角为1.9°,具有优异的防污性能。涂层经受刀片划伤后通过简单热处理即可修复划痕,自修复性能优异。与纯铝相比,该复合涂层具有良好的防腐性能,缓蚀效率可达87.53%。此外,经历5次胶带剥离、磨损长度为30 cm的线性耐磨测试、50 min的超声振荡测试、10次温差循环和24 h紫外照射后,接触角依旧保持在150°以上,说明该涂层具有良好的耐候性和机械稳定性。该研究为自修复超疏水涂层的制备提供了新策略,有望应用于建筑防污领域。

     

  • 图  1  (a) 十四酸(MA)改性SiO2 (MA-SiO2)的反应机制;(b) MA-SiO2/超支化聚二甲基硅氧烷(HB-PDMS)涂层的制备过程示意图

    Figure  1.  (a) Diagram of the reaction mechanism of myristic acid (MA) modified SiO2 (MA-SiO2); (b) Schematic diagram of the preparation process of MA-SiO2/hyperbranched polydimethylsiloxane (HB-PDMS) coating

    THF—Tetrahydrofuran

    图  2  MA改性剂用量((a), (b)) 和改性时间 ((c), (d)) 对SiO2疏水度和涂层润湿性的影响

    Figure  2.  Effect of MA modifier dosage ((a), (b)) and modification time ((c), (d)) on hydrophobicity of SiO2 and wettability of coatings

    m (MA)∶m (SiO2)—Mass ratio of myristic acid and SiO2

    图  3  MA改性SiO2前 ((a1)~(a3), (c)) 和后 ((b1)~(b3), (d)) 的SEM图像与EDS图谱

    Figure  3.  SEM images and EDS mapping of SiO2 before ((a1)-(a3), (c)) and after ((b1)-(b3), (d)) MA modification

    图  4  HB-PDMS涂层 ((a), (c)) 和MA-SiO2/HB-PDMS涂层 ((b), (d)) 的SEM图像与EDS图谱

    Figure  4.  SEM images and EDS mapping of HB-PDMS coating ((a), (c)) and MA-SiO2/HB-PDMS coating ((b), (d))

    图  5  MA改性前后SiO2的FTIR图谱

    Figure  5.  FTIR spectra of SiO2 before and after MA modification

    图  6  MA-SiO2/HB-PDMS复合涂层的损伤-修复过程显微照片 ((a)~(c), ((a1)~(c1)));(d) MA-SiO2/HB-PDMS复合涂层的修复机制;(e) MA-SiO2/HB-PDMS涂层修复前后Tafel测试结果;(f) 从极化曲线获得的MA-SiO2/HB-PDMS涂层自修复测试前后的腐蚀参数;(g) MA-SiO2/HB-PDMS涂层防Cl渗透机制示意图

    Figure  6.  Micrographs of damage-repair process of MA-SiO2/HB-PDMS composite coating ((a)-(c), ((a1)-(c1))); (d) Repair mechanism of MA-SiO2/HB-PDMS composite coating; (e) Tafel results before and after self-healing of MA-SiO2/HB-PDMS coatings; (f) Corrosion parameters obtained from potentiodynamic polarization curves with the self-healing tests of MA-SiO2/HB-PDMS coatings; (g) Schematic diagram of anti-Cl penetration mechanism of MA-SiO2/HB-PDMS coatings

    i—Current density; Ecorr—Corrosion potential; Icorr—Corrosion current density

    图  7  (a) 裸铝和涂覆MA-SiO2/HB-PDMS涂层的铝的极化曲线;(b) Nyquist图;(c) Bode图;((d), (e)) 等效电路图

    Figure  7.  (a) Polarisation curves for bare Al and Al coated with MA-SiO2/HB-PDMS; (b) Nyquist plot; (c) Bode plot; ((d), (e)) Equivalent circuit diagram

    Z'—Impedance real part; Z"—Impedance imaginary part; Rs—Solution resistance between the reference electrode and specimens; Rct—Charge transfer resistance; Rcoat—Resistance of the superhydrophobic coating; Cdl, Ccoat—Double layer capacitance on metal surface and capacitance on coating itself, respectively; W—Warburg resistance

    图  8  纯玻璃(上)和MA-SiO2/HB-PDMS涂覆玻璃(下)的防污效果

    Figure  8.  Antifouling effect of pure glass (top) and MA-SiO2/HB-PDMS coated glass (bottom)

    图  9  各涂层耐候性测试结果:(a) 温差循环实验;(b) 耐紫外老化实验

    Figure  9.  Results of weather resistance tests on coatings: (a) Temperature cycling test; (b) UV ageing test

    图  10  各涂层的机械稳定性测试结果:((a), (b)) 线性耐磨试验;(c) 胶带剥离试验;(d) 超声振荡试验

    Figure  10.  Mechanical stability test results of the coating: ((a), (b)) Linear wear test; (c) Tape peel test; (d) Ultrasonic shock test

    表  1  极化曲线中获得的裸铝和MA-SiO2/HB-PDMS涂层铝表面的腐蚀参数

    Table  1.   Corrosion parameters of bare Al and MA-SiO2/HB-PDMS coated Al surface obtained from polarization curves

    SamplesEcorr (vs Ag/AgCl)/mVIcorr/(μA·cm−2)
    Bare Al−6964.81
    Al coated with MA-SiO2/HB-PDMS 1660.60
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  • 收稿日期:  2023-03-17
  • 修回日期:  2023-04-23
  • 录用日期:  2023-05-04
  • 网络出版日期:  2023-05-11
  • 刊出日期:  2024-01-01

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