| 摘要: |
| 以氯化铵作为脲醛树脂/环氧树脂(UF/E)自修复微胶囊改性剂，通过原位聚合法制备UF/E自修复微胶囊，探明氯化铵用量(质量分数，下同)对UF/E自修复微胶囊颗粒特征和囊化指标的影响，同时采用傅里叶变换红外光谱(FTIR)，热重分析(TGA)和环境扫描电镜(ESEM)来表征其化学结构和热稳定性.结果表明：随着氯化铵用量与脲醛树脂预聚体用量比值的增加，UF/E自修复微胶囊的产率和芯材含量先增加后减少；当氯化铵用量与脲醛树脂预聚体用量的比值为1150%时，微胶囊产率和芯材含量均达到最高值，分别为7905%和6840%，此时UF/E自修复微胶囊球形饱满，表面粗糙，整体分散性好，有利于其与水泥基材料的结合；随着氯化铵用量的增加，反应体系pH值下降速度加快，加速了脲醛树脂颗粒在微胶囊表面的堆积，使微胶囊的粒径呈上升趋势.通过分析UF/E自修复微胶囊的化学结构和热稳定性，证明脲醛树脂壁材能成功包封环氧树脂芯材，且具有良好的热稳定性. |
| 关键词: 氯化铵 自修复微胶囊 囊化指标 化学结构 热稳定性 |
| DOI：103969/j.issn1007 9629201806008 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51562024)；江西省杰出青年人才资助计划(20162BCB23014) |
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| Performance Characterization of UF/E Self healing Microcapsules Modified by Ammonium Chloride |
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WANG Xingang, XU Wei, XIE Yuhao, XIA Long
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School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China
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| Abstract: |
| Urea formaldehyde/Epoxy(UF/E) self healing microcapsules were prepared by in situ polymerization using ammonium chloride as UF/E self healing microcapsule modifier. To find out the effects of the content(by mass, the same below) of ammonium chloride on the particle characteristics and encapsulated indicators of UF/E self healing microcapsules, chemical structure and thermal stability were characterized by FTIR, TGA and ESEM. The results show that the yield and core content of UF/E self healing microcapsules reduce after increase of ammonium chloride/UF prepolymer mass ratio. When the mass ratio of ammonium chloride/UF prepolymer is 1150%, both the yield and core content reach the highest levels which are 7905% and 6840%, respectively. UF/E self healing microcapsules are spherical and full, with rough surface and good overall dispersion, which are conducive to the combination of cement based materials. With the increase of ammonium chloride content, the pH value of the reaction system decreases, the accumulation of urea formaldehyde resin particles on the surface of microcapsules is accelerated, and the particle size of microcapsules is increased. By analyzing the chemical structure and thermal stability of UF/E self healing microcapsules, it is proved that urea formaldehyde resin shell material encapsulates epoxy resin core material successfully and has good thermal stability. |
| Key words: ammonium chloride self healing microcapsule encapsulated indicator chemical structure thermal stability |
