通过蒸发结晶法制备的Janus聚合物单晶纳米片

Janus Polymer Single Crystal Nanosheet via Evaporative Crystallization.

作者信息

Qi Hao, Wang Wenda, Li Christopher Y

机构信息

Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.

出版信息

ACS Macro Lett. 2014 Jul 15;3(7):675-678. doi: 10.1021/mz5002806. Epub 2014 Jun 27.

DOI:10.1021/mz5002806

PMID:35590767

Abstract

We show that liquid/liquid interface can guide polymer chain folding during crystallization. Evaporation-induced crystallization of telechelic dicarboxyl end-functionalized poly(ε-caprolactone) (COOH-PCL-COOH) at a water/pentyl acetate interface produced millimeter-scale, uniform polymer single crystal (PSC) films. Due to the asymmetric nature at the interface, the PSC nanosheets exhibited a Janus structure: the two surfaces of the crystal showed distinct water contact angle, which are quantitatively confirmed by in situ nanocondensation using environmental scanning electron microscopy (ESEM).

摘要

我们表明，液/液界面可在结晶过程中引导聚合物链折叠。在水/乙酸戊酯界面上，遥爪二羧基端官能化聚己内酯（COOH-PCL-COOH）的蒸发诱导结晶产生了毫米级的均匀聚合物单晶（PSC）薄膜。由于界面处的不对称性质，PSC纳米片呈现出一种两面神结构：晶体的两个表面表现出明显不同的水接触角，这通过使用环境扫描电子显微镜（ESEM）的原位纳米凝聚得到了定量证实。