Fabrication of urea formaldehyde–epoxy resin microcapsules for the preparation of high self-healing ability containing SBS modified asphalt,Polymer Composites

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Fabrication of urea formaldehyde–epoxy resin microcapsules for the preparation of high self-healing ability containing SBS modified asphalt
Polymer Composites ( IF 4.8 ) Pub Date : 2021-06-01 , DOI: 10.1002/pc.26135
Song Yang ₁ , Jiaqi Ji ₂ , Hua Tao ₂ , Yaseen Muhammad ₃ , Junxian Huang ₁ , Shanshan Wang ₁ , Yunhao Wei ₁ , Jing Li _{1,

3}

Affiliation

Asphalt exhibits self-healing ability, though at a lower rate. In this study, urea formaldehyde–epoxy resin (UFE) microcapsules were prepared using polyurea formaldehyde as the wall and epoxy resin as the core material, which were in turn applied to fabricate UFE–styrene butadiene styrene modified asphalt (abbreviated as UBS asphalt). Scanning electron microscopy and transmission electron microscopy analyses revealed well-coated microcapsules have globular geometry with obvious folds in the wall. Ductility test showed 90% higher healing rate of UBS asphalt than pure styrene butadiene styrene (SBS) modified asphalt. Dynamic shear rheometer and multi-stress creep recovery tests indicated that UFE microcapsule incorporation can improve the viscoelasticity, high temperature stability, and permanent deformation resistance of pure SBS modified asphalt attributed to the even distribution of UFE microcapsules in asphalt and their better mutual compatibility, which was confirmed by fluorescence microscopy. At 100 and 3200 Pa, the recovery rate of 0.4% UBS asphalt was 32.1% and 71.7% higher than that of the original SBS modified asphalt, respectively. UFE microcapsule and asphalt only physically interacted as confirmed by Fourier infrared spectroscopy analysis. This study provides a feasible alternative approach for the preparation of UBS asphalt with enhanced mechanical properties and thermal stability for applications in construction and highway industries.

中文翻译：

脲醛-环氧树脂微胶囊制备高自愈性含SBS改性沥青

沥青具有自愈能力，但速度较低。本研究以聚脲甲醛为壁面，环氧树脂为芯材，制备了脲醛-环氧树脂（UFE）微胶囊，进而用于制备 UFE-苯乙烯丁二烯苯乙烯改性沥青（简称 UBS 沥青）。扫描电子显微镜和透射电子显微镜分析表明，涂层良好的微胶囊具有球状几何形状，壁上有明显的褶皱。延展性测试表明，UBS 沥青的愈合率比纯苯乙烯丁二烯苯乙烯 (SBS) 改性沥青高 90%。动态剪切流变仪和多应力蠕变恢复测试表明 UFE 微胶囊的掺入可以提高粘弹性、高温稳定性、纯 SBS 改性沥青的永久变形抗力归因于 UFE 微胶囊在沥青中的均匀分布及其更好的相互相容性，这通过荧光显微镜得到证实。在 100 和 3200 Pa 时，0.4% UBS 沥青的回收率分别比原 SBS 改性沥青高 32.1% 和 71.7%。傅立叶红外光谱分析证实，UFE 微胶囊和沥青仅发生物理相互作用。该研究为制备具有增强机械性能和热稳定性的 UBS 沥青提供了一种可行的替代方法，可用于建筑和公路行业。0.4%UBS沥青的回收率比原SBS改性沥青分别提高32.1%和71.7%。傅立叶红外光谱分析证实，UFE 微胶囊和沥青仅发生物理相互作用。该研究为制备具有增强机械性能和热稳定性的 UBS 沥青提供了一种可行的替代方法，可用于建筑和公路行业。0.4%UBS沥青的回收率比原SBS改性沥青分别提高32.1%和71.7%。傅立叶红外光谱分析证实，UFE 微胶囊和沥青仅发生物理相互作用。该研究为制备具有增强机械性能和热稳定性的 UBS 沥青提供了一种可行的替代方法，可用于建筑和公路行业。

更新日期：2021-08-10

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