Institute of Materials Science and Engineering, and Department of Materials & Mineral Resources Engineering, National Taipei University of Technology , Taipei 10608, Taiwan.
Material and Chemical Research Laboratories, Industrial Technology Research Institute , Hsinchu 30011, Taiwan.
Langmuir. 2017 Jun 13;33(23):5843-5851. doi: 10.1021/acs.langmuir.7b01066. Epub 2017 May 26.
Robust poly(urea-formaldehyde) (PUF) microcapsules with composite shells comprising zirconia (ZrO) nanopowder incorporated in PUF were fabricated via a novel and facile one-pot synthesis. ZrO nanopowder was chosen because it owns one of the highest mechanical strengths among ceramics. The nanopowder was predispersed in the core material to combine encapsulation and fortification into a single process. In the core, the well-dispersed nanopowder migrated to the interface, where PUF polymerization took place. The mechanical strength of the microcapsule with nano-ZrO incorporated in the shell (42% by weight) is three times greater than that of the microcapsule without ZrO. In a preliminary application wherein the microcapsules were embedded in a model of poly(vinyl alcohol) (PVA) membrane, the PVA specimen exhibited a higher ultimate tensile strength when fortified microcapsules were embedded than when unfortified microcapsules were used.
通过一种新颖且简便的一锅法合成，制备了具有包含氧化锆（ZrO）纳米粉末的复合壳的坚固的聚脲甲醛（PUF）微胶囊。选择 ZrO 纳米粉末是因为它在陶瓷中拥有最高的机械强度之一。纳米粉末预先分散在芯材中，将封装和增强结合到单个工艺中。在芯材中，良好分散的纳米粉末迁移到发生 PUF 聚合的界面处。在壳中掺入纳米 ZrO 的微胶囊（重量比为 42%）的机械强度比没有 ZrO 的微胶囊高 3 倍。在一个初步应用中，将微胶囊嵌入到聚乙烯醇（PVA）膜模型中，当嵌入增强微胶囊时，PVA 试样表现出更高的极限拉伸强度，而当使用未增强微胶囊时则较低。
