Lu, Xiaolin Han, Jianglong Shephard, Nick Rhodes, Susan Martin, Alex D. Li, Dawei Xue, Gi Chen, Zhan Phenolic Resin Surface Restructuring upon Exposure to Humid Air: A Sum Frequency Generation Vibrational Spectroscopic Study Epoxy and phenolic resins are extensively used for modern microelectronics, for example, as packaging materials. Humidity may greatly alter or degrade their function and application, leading to failure of the device. A nonlinear optical laser technique, sum frequency generation (SFG) vibrational spectroscopy, was used to investigate the molecular surface structures of the epoxy and phenolic resins after exposure to humid air. It was found that the adsorbed water molecules at the phenolic resin surface can induce substantial surface restructuring. The surface phenyl groups were reoriented closer to a perpendicular position to the surface after exposure to humid air from a more parallel position in air. Epoxide group surface restructuring was not observed. surface phenyl groups;Epoxide group surface restructuring;phenolic resins;phenolic resin surface;SFG;Sum Frequency Generation Vibrational Spectroscopic StudyEpoxy;sum frequency generation;Phenolic Resin Surface Restructuring 2009-10-01
    https://acs.figshare.com/articles/journal_contribution/Phenolic_Resin_Surface_Restructuring_upon_Exposure_to_Humid_Air_A_Sum_Frequency_Generation_Vibrational_Spectroscopic_Study/2824855
10.1021/jp9058092.s001