Davis, Chelsea S.; Rencheck, Mitchell L.; Woodcock, Jeremiah W.; Beams, Ryan; Wang, Muzhou; Stranick, Stephan; Forster, Aaron M.; Gilman, Jeffrey W. published the artcile< Activation of Mechanophores in a Thermoset Matrix by Instrumented Scratch>, Product Details of C30H36N4O2, the main research area is mechanophore epoxy resin transparent coating scratch damage analysis; damage sensing; epoxy; instrumented scratch; mechanophore; organic coating; polymer; strain sensor.
Scratches in polymer coatings and barrier layers neg. impact optical properties (haze, light transmission, etc.), initiate routes of degradation or corrosion (moisture permeability), and nucleate delamination of the coating. Detecting scratches in coatings on advanced materials systems is an important component of structural health monitoring but can be difficult if the defects are too small to be detected by the naked eye. The primary focus of the present work is to investigate scratch damage using fluorescence lifetime imaging microscopy (FLIM) and mech. activation of a mechanophore (MP)-containing transparent epoxy coating. The approach utilizes a Berkovich tip to scratch MP-epoxy coatings under a linearly increasing normal load. The goal is to utilize the fluorescent behavior of activated MPs to enable the detection of microscale scratches and mol. scale changes in polymeric systems. Taking advantage of the amine functionality present in a polyetheramine/bisphenol A epoxy network, a modified Rhodamine dye is covalently bonded into a transparent, thermoset polymer network. Following instrumented scratch application, subsequent fluorescence imaging of the scratched MP-epoxy reveals the extent of fluorescence activation induced by the mech. deformation. In this work, the Rhodamine-based mechanophore is used to identify both ductile and fracture-dominated processes during the scratch application. The fluorescence intensity increases linearly with the applied normal load and is sensitive to fracture dominated processes. Fluorescence lifetime and hyperspectral imaging of damage zones provide addnl. insight into the local (nanoscopic) environment and mol. structure of the MP around the fracture process zone, resp. The mechanophore/scratch deformation approach allows a fluorescence microscope to probe local yielding and fracture events in a powerful way that enhances the optical characterization of damage zones formed by standard scratch test methods and leads to novel defect detection strategies.
ACS Applied Materials & Interfaces published new progress about Crosslinking. 950846-89-6 belongs to class indole-building-block, and the molecular formula is C30H36N4O2, Product Details of C30H36N4O2.
Referemce:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles