Citation: Hao-ge Cheng, Xu Zhu, Dong Fu, Xin-yue Zhang, Hao Wei, Ning Ma. One-step Fabrication of 2D Micro-hemispheres through the Improved Breath Figure Method[J]. Acta Polymerica Sinica, ;2019, 50(4): 393-401. doi: 10.11777/j.issn1000-3304.2018.18226 shu

One-step Fabrication of 2D Micro-hemispheres through the Improved Breath Figure Method

College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001

Corresponding author: Xin-yue Zhang, xinyue@hrbeu.edu.cn Ning Ma, nma@hrbeu.edu.cn
Received Date: 29 October 2018
Revised Date: 26 November 2018
Available Online: 28 December 2018

Traditional breath figure method was improved via the introduction of polymer pre-phase separation. The morphology and size distribution of microsturctures prepared could be finely tuned by pre-phase separation time, PEG molecular weight, the ratio between different PEG molecules, and blending with small PS molecules. Specifically, compared with 20 and 30 min, the pre-phase separation time of 10 min could yield the most uniform structures; PEG2000 stood out from all PEG molecules tested with molecular weight from 2000 to 10000 and afforded microstructures of the highest compactness and homogeneity; introducing PEG200 the even smaller molecule would enhance the phase separation degree between PS and PEG. Furthermore, ratio variation between PEG200 and PEG2000 suggested that the maximal micro-convexes could be obtained at ratio of 2:8, while a honeycomb morphology was observed at 3:7. Among all the factors investigated, PS molecular weight played a dominant role on topography regulation. PS with lower molecular weight could reduce the molecular chain twisting for all polymer components, which conduced to the polymer phase separation. Addition of PS18000 rather than PS260000 could increase micro-convex amount as well as improve the uniformity of as-prepared structures dramatically. The honeycomb micro-hemisphere arrays were ultimately achieved through one-step breath figure method under the optimized conditions of pre-phase separation time as 10 min, PEG200:PEG2000 ratio as 3:7, and PS18000 participation; in the meantime, three structures including holes, half-holes, and convexes appeared on the substrate. Scrutinize of the underlying mechanism indicated that distribution and assembly of PEG molecules inside or on the surface of water droplets functioned decisively towards the topography of structures formed. This study provides novel insight into highly efficent fabrication of micro-hemispheres arrays.
- Breath figure,
- Polymer phase separation,
- 2D Micro-hemisphere
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沈阳化工大学材料科学与工程学院沈阳 110142