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<p>Microcapsules of polystyrene (PS) containing polyether amine (PEA) were prepared by solvent evaporation method. The effects of varying core-to-shell ratio, agitation rate, emulsifier type and ratio on the preparation of microcapsules were investigated. The physical and chemical properties of microcapsules were comprehensively characterized by optical microscope, scanning electron microscope, Fourier infrared spectroscopy and thermogravimetric analysis. The results demonstrate that microcapsules prepared with a core-to-shell ratio of 2:1, agitation rate of 400 r/min and an emulsifier consisting of 1 wt% polyvinyl alcohol (PVA) /3 wt% sodium oleate (NaOA) exhibit the highest content of core material at 43.4 wt% and encapsulation efficiency at 65.0%, respectively. They demonstrate excellent thermal stability below 330℃and aging performance at 60℃ and 100℃, while exhibiting limited resistance to ethyl acetate solvent, poor resistance to anhydrous ethanol and n-hexane, as well as decent water resistance. A self-healing epoxy anticorrosive coating was prepared by combining PS-PEA microcapsules with polyurethane (PU)-isophorone diisocyanate (IPDI) microcapsules. Benefiting from the microcapsule curing agent, this double-microcapsule system exhibited excellent self-healing capabilities as demonstrated by scratch corrosion tests. Notably, when both microcapsules were present at a content of 5 wt%, the epoxy coating achieved remarkable self-healing performance with a repair efficiency of 75.8%.</p>

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Preparation and properties of polystyrene-polyetheramine self-healing microcapsules by solvent evaporation method

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Liye Yuan,
  • Chunxiang Lu,
  • Congwei Wang,
  • Junwei Wang,
  • Yu Yang,
  • Lijuan Cao,
  • Jieying Zhi,
  • Xiaoxuan Lu

摘要

Microcapsules of polystyrene (PS) containing polyether amine (PEA) were prepared by solvent evaporation method. The effects of varying core-to-shell ratio, agitation rate, emulsifier type and ratio on the preparation of microcapsules were investigated. The physical and chemical properties of microcapsules were comprehensively characterized by optical microscope, scanning electron microscope, Fourier infrared spectroscopy and thermogravimetric analysis. The results demonstrate that microcapsules prepared with a core-to-shell ratio of 2:1, agitation rate of 400 r/min and an emulsifier consisting of 1 wt% polyvinyl alcohol (PVA) /3 wt% sodium oleate (NaOA) exhibit the highest content of core material at 43.4 wt% and encapsulation efficiency at 65.0%, respectively. They demonstrate excellent thermal stability below 330℃and aging performance at 60℃ and 100℃, while exhibiting limited resistance to ethyl acetate solvent, poor resistance to anhydrous ethanol and n-hexane, as well as decent water resistance. A self-healing epoxy anticorrosive coating was prepared by combining PS-PEA microcapsules with polyurethane (PU)-isophorone diisocyanate (IPDI) microcapsules. Benefiting from the microcapsule curing agent, this double-microcapsule system exhibited excellent self-healing capabilities as demonstrated by scratch corrosion tests. Notably, when both microcapsules were present at a content of 5 wt%, the epoxy coating achieved remarkable self-healing performance with a repair efficiency of 75.8%.