采用原位聚合法制备聚脲甲醛包覆水性环氧树脂微胶囊,测定其产率及含芯量,表征了表面形貌及化学结构,并考察了微胶囊水泥石修复性能。结果表明：芯壁比为2.4∶1时微胶囊最佳,含芯量达76.1%,粒径约为200μm;微胶囊掺量为1%时,水泥石同时具有良好的压缩强度和修复性能,极限预破坏修复率为87%;预破坏程度为60%时,修复率最高;微胶囊粗糙蓬松的外壁与水泥石基体有良好的胶接性,内壁厚约0.5μm,易在水泥石基材中发生应力撕裂而发挥修复作用。
Microcapsules with poly（urea-formaldehyde）（PUF） as shell materials and water-based epoxy as core materials were prepared by in-situ polymerization.Their yield,core content,surface appearance and chemical structure were analyzed,and the self-healing performance of microcapsule cement was also evaluated.The results indicate the microcapsules with core-wall ratio of 2.4∶1 show the best properties.Its core content is 76.1% and particle size is about 200 μm.When the dosage of embedding microcapsules is 1%,the set cement is both well in compressive resistance and healing efficiency,and its healing efficiency under the extreme pre-fracture condition is 87%.The set cement,broken 60% before,has the highest healing efficiency.The microcapsules with rough outer shell have good compatibility with the cement matrix and their inner shell with thickness about 0.5 μm is prone to trigger by tearing stress to play the repair action.
参考文献
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