刷状嵌段共聚物的快速自组装为光子晶体。
Rapid self-assembly of brush block copolymers to photonic crystals.
机构信息
Arnold and Mabel Beckman Laboratories for Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
出版信息
Proc Natl Acad Sci U S A. 2012 Sep 4;109(36):14332-6. doi: 10.1073/pnas.1213055109. Epub 2012 Aug 21.
Abstract
The reduced chain entanglement of brush polymers over their linear analogs drastically lowers the energetic barriers to reorganization. In this report, we demonstrate the rapid self-assembly of brush block copolymers to nanostructures with photonic bandgaps spanning the entire visible spectrum, from ultraviolet (UV) to near infrared (NIR). Linear relationships were observed between the peak wavelengths of reflection and polymer molecular weights. This work enables "bottom-up" fabrication of photonic crystals with application-tailored bandgaps, through synthetic control of the polymer molecular weight and the method of self-assembly. These polymers could be developed into NIR-reflective paints, to combat the "urban heat island effect" due to NIR photon thermalization.
摘要
刷状聚合物的链缠结减少，大大降低了重组的能量势垒。在本报告中，我们证明了刷状嵌段共聚物快速自组装成具有光子带隙的纳米结构，其带隙范围涵盖整个可见光谱，从紫外线 (UV) 到近红外 (NIR)。反射峰波长与聚合物分子量之间存在线性关系。这项工作通过控制聚合物分子量和自组装方法，实现了具有应用针对性带隙的光子晶体的“自下而上”制造。这些聚合物可以开发成近红外反射涂料，以对抗由于近红外光子热化而导致的“城市热岛效应”。
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