Li Huateng, Wu Pan, Zhao Guowei, Guo Jia, Wang Changchun
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China.
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China.
J Colloid Interface Sci. 2021 Feb 15;584:145-153. doi: 10.1016/j.jcis.2020.09.084. Epub 2020 Sep 25.
Polymer photonic crystals have drawn a lot of interest due to cost-effective fabrication. Although tremendous efforts are tried, almost no large-size photonic crystal (PC) films can be obtained due to different kinds of reasons. The main issues are the tedious process and strict preparation conditions (like high temperature and solvents), sometimes the limitation of the machinery equipment, accordingly they are not conducive to preparation of subsequent large-scale PC films. Hence, there is an urgent desire to develop a technique that can assemble polymer PC films in a large scale at low temperature without solvent.
Through semi-continuous emulsion polymerization, core-interlayer-shell (CIS) colloidal particles (PS@PEA@P2EHA) were synthesized with the output of 240 g/h. After the successful production of polymer PC films in the laboratory at room temperature, industrial roll-to-roll process was used for large-scale production of the PC films.
By introducing poly(2-ethylhexyl acrylate) which has quite low glass transition temperature (T) into the shell, we have successfully developed an energy-efficient technique for fabrication of large-area (over 100 m) polymer PC films at ambient temperature for the first time. This technique has great potential to promote the industrial application of PC films, such as display, sensors, anti-counterfeiting and so on.
聚合物光子晶体因其具有成本效益的制造方法而备受关注。尽管人们付出了巨大努力，但由于各种原因，几乎无法获得大尺寸的光子晶体（PC）薄膜。主要问题在于工艺繁琐且制备条件苛刻（如高温和使用溶剂），有时还受到机械设备的限制，因此不利于后续大规模PC薄膜的制备。所以，迫切需要开发一种能够在低温且无溶剂的条件下大规模组装聚合物PC薄膜的技术。
通过半连续乳液聚合，以240 g/h的产量合成了核-中间层-壳（CIS）胶体颗粒（PS@PEA@P2EHA）。在实验室成功制备出聚合物PC薄膜后，采用工业卷对卷工艺进行PC薄膜的大规模生产。
通过将玻璃化转变温度（T）相当低的聚（丙烯酸2-乙基己酯）引入到壳层中，我们首次成功开发出一种节能技术，可在环境温度下制备大面积（超过100平方米）的聚合物PC薄膜。该技术在推动PC薄膜的工业应用方面具有巨大潜力，如显示、传感器、防伪等领域。
