Evaluating the use of self-assembled monolayer (SAM) release coatings for replicated optics
Evaluating the use of self-assembled monolayer (SAM) release coatings for replicated optics
复制标题
评估自组装单层 (SAM) 脱模涂层在复制光学器件中的使用
DOI：
10.1080/01694243.2016.1185240
复制
发表时间：
2016
影响因子：
2.3
通讯作者：
R. Zaldivar
中科院分区：
文献类型：
--
作者：
H. Kim;Geena L. Ferrelli;R. Zaldivar
摘要：与传统加工的玻璃镜相比，碳纤维增强复合材料复制镜可减轻重量、提高刚度、可定制的热膨胀系数、更高的热导率以及优异的耐损伤机械性能。这些镜子还可以通过多次复制高精度玻璃心轴的表面来快速制造。所使用的脱模涂层至关重要，必须在分子尺度上、均匀且具有低粘附力，才能产生高保真复制。本研究探讨了使用自组装单层 (SAM) 作为脱模剂来制造复制镜子。我们合成并测试了通过自组装在玻璃基板上形成的全氟聚醚（PFPE）涂层。使用椭圆光度法、X射线光电子能谱和原子力显微镜来表征涂层的形貌、厚度均匀性和化学分布。从心轴上移除复制表面所需的释放力至关重要，并且与复制品的表面变形直接相关。由于针孔和缺陷，脱模力随着每次连续复制而增加。加入次要的、较低分子量的 SAM 试剂可显着减少表面团聚以及 SAM 材料向复制树脂表面的转移。由于 SAM 涂层缺陷密度的降低，复制品脱模力降低了 60%，复制品表面形状提高了 50%。
Abstract Carbon fiber-reinforced composite replicated mirrors offer weight savings, higher stiffness, tailorable CTEs, higher thermal conductivities, and excellent damage tolerant mechanical properties in comparison to traditionally processed glass mirrors. These mirrors can also be rapidly manufactured by replicating the surface of a high-precision glass mandrel multiple times. The mold release coating used is critical and must be on the molecular scale, uniform, and exhibit low adhesion in order to produce high-fidelity replication. This study investigates the use of a self-assembled monolayer (SAM) as the mold release agent for the manufacture of replicated mirrors. We have synthesized and tested perfluoropolyether (PFPE) coatings formed on glass substrate via self-assembly. Ellipsometry, X-ray photoelectron spectroscopy, and atomic force microscopy were used to characterize the morphology, thickness uniformity and the chemical profile of the coatings. The release force necessary to remove the replicated surfaces from the mandrel is critical and was directly related to the surface distortion of the replica. The release force increased with each successive replication due to pinholes and defects. Incorporating a secondary, lower molecular weight SAM reagent significantly reduced both surface agglomeration and transfer of SAM material to the replicated resin surface. A 60% reduction in the replica release force and a 50% improvement in the replica surface figure were achieved due to reductions in the defect density of the SAM coating.