a School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou , PR China.
b School of Chemical Engineering , University of Birmingham , Edgbaston, Birmingham , UK.
J Microencapsul. 2018 May;35(3):219-228. doi: 10.1080/02652048.2018.1462414. Epub 2018 May 2.
There is lack of understanding on controlling of mechanical properties of moisture-curing PU/MF microcapsules which limited its further application. PU/MF microcapsules containing a core of isophorone diisocyanate (IPDI) were prepared with different chain extenders, polyetheramine D400, HO, triethylenetetramine and polyetheramine (PEA) D230 by following a two-step synthesis method in this study. Fourier transform infra-red (FTIR) spectroscopy, Malvern particle sizing, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). And micromanipulation technique was used to identify chemical bonds in the shell, size distributions, structure, thickness, and mechanical properties of microcapsules. The results show that PU/MF microcapsules were successfully prepared. Tr increased from 46.4 ± 13.9 N/m to 75.8 ± 23.3 N/m when extender changed from D400 to D230. And the Tr increased from 51.3 ± 14.1 to 94.8 ± 17.5 N/m when the swelling time increased from 1 to 3h. Morphologies of the shell were utilised to understand the mechanism of reactions in forming the shell materials.
对湿固化 PU/MF 微胶囊力学性能的控制缺乏了解，限制了其进一步的应用。本研究采用两步合成法，以异佛尔酮二异氰酸酯（IPDI）为芯材，聚醚胺 D400、HO、三乙烯四胺和聚醚胺（PEA）D230 为扩链剂，制备了含有 IP-DI 核的 PU/MF 微胶囊。采用傅里叶变换红外（FTIR）光谱、马尔文粒径分析、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对微胶囊的结构、粒径分布、形貌、厚度和力学性能进行了研究。采用微操纵技术对壳层中的化学键进行了鉴定。结果表明，成功制备了 PU/MF 微胶囊。当扩链剂从 D400 变为 D230 时，Tr 从 46.4±13.9 N/m 增加到 75.8±23.3 N/m。当溶胀时间从 1 小时增加到 3 小时时，Tr 从 51.3±14.1 增加到 94.8±17.5 N/m。壳层的形态被用来理解形成壳层材料的反应机制。
