Griebel Jared J, Nguyen Ngoc A, Namnabat Soha, Anderson Laura E, Glass Richard S, Norwood Robert A, Mackay Michael E, Char Kookheon, Pyun Jeffrey
Department of Chemistry and Biochemistry, University of Arizona, 1306 East University Boulevard, Tucson, Arizona 85721, United States.
Department of Materials Science and Engineering, University of Delaware, 201 DuPont Hall, Newark, Delaware 19716, United States.
ACS Macro Lett. 2015 Sep 15;4(9):862-866. doi: 10.1021/acsmacrolett.5b00502. Epub 2015 Aug 16.
We report on dynamic covalent polymers derived from elemental sulfur that can be used as thermally healable optical polymers for mid-IR thermal imaging applications. By accessing dynamic S-S bonds in these sulfur copolymers, surface scratches and defects of free-standing films of poly(sulfur--1,3-diisopropenylbenzene) (poly(S--DIB) can be thermally healed, which enables damaged lenses and windows from these materials to be reprocessed to recover their IR imaging performance. Correlation of the mechanical properties of these sulfur copolymers with different curing methods provided insights to reprocess damaged samples of these materials. Mid-IR thermal imaging experiments with windows before and after healing of surface defects demonstrated successful application of these materials to create a new class of "scratch and heal" optical polymers. The use of dynamic covalent polymers as healable materials for IR applications offers a unique advantage over the current state of the art (e.g., germanium or chalcogenide glasses) due to both the dynamic character and useful optical properties of S-S bonds.
我们报道了一种由元素硫衍生而来的动态共价聚合物，它可用作适用于中红外热成像应用的可热修复光学聚合物。通过利用这些硫共聚物中的动态S-S键，聚（硫-1,3-二异丙烯基苯）（聚（S-DIB））自支撑膜的表面划痕和缺陷能够被热修复，这使得由这些材料制成的受损透镜和窗口能够被重新加工以恢复其红外成像性能。这些硫共聚物的机械性能与不同固化方法之间的相关性为重新加工这些材料的受损样品提供了思路。对表面缺陷修复前后的窗口进行中红外热成像实验，证明了这些材料成功应用于制造一类新型的“划痕修复”光学聚合物。由于S-S键的动态特性和有用的光学性质，使用动态共价聚合物作为红外应用的可修复材料比目前的技术水平（例如锗或硫系玻璃）具有独特优势。
